{"id":10986,"date":"2026-08-22T06:17:12","date_gmt":"2026-08-22T06:17:12","guid":{"rendered":"https:\/\/www.lyasilicone.com\/?p=10986"},"modified":"2026-08-22T06:17:12","modified_gmt":"2026-08-22T06:17:12","slug":"silicone-molding-shrinkage-guide","status":"publish","type":"post","link":"https:\/\/www.lyasilicone.com\/ru\/silicone-molding-shrinkage-guide\/","title":{"rendered":"Why Does Silicone Shrink After Molding, and How Should Buyers Plan for It?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_73 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0421\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.lyasilicone.com\/ru\/silicone-molding-shrinkage-guide\/#What_Is_Silicone_Molding_Shrinkage\" title=\"What Is Silicone Molding Shrinkage?\">What Is Silicone Molding Shrinkage?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.lyasilicone.com\/ru\/silicone-molding-shrinkage-guide\/#Why_Is_There_No_Universal_Silicone_Shrinkage_Rate\" title=\"Why Is There No Universal Silicone Shrinkage Rate?\">Why Is There No Universal Silicone Shrinkage Rate?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.lyasilicone.com\/ru\/silicone-molding-shrinkage-guide\/#Why_Does_Product_Geometry_Affect_Final_Dimensions\" title=\"Why Does Product Geometry Affect Final Dimensions?\">Why Does Product Geometry Affect Final Dimensions?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.lyasilicone.com\/ru\/silicone-molding-shrinkage-guide\/#How_Does_Wall_Thickness_Affect_Shrinkage_Control\" title=\"How Does Wall Thickness Affect Shrinkage Control?\">How Does Wall Thickness Affect Shrinkage Control?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.lyasilicone.com\/ru\/silicone-molding-shrinkage-guide\/#Example_Custom_Silicone_Baby_Suction_Bowl_With_Lid\" title=\"Example: Custom Silicone Baby Suction Bowl With Lid\">Example: Custom Silicone Baby Suction Bowl With Lid<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.lyasilicone.com\/ru\/silicone-molding-shrinkage-guide\/#Why_Should_Matching_Silicone_Parts_Be_Tested_Together\" title=\"Why Should Matching Silicone Parts Be Tested Together?\">Why Should Matching Silicone Parts Be Tested Together?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.lyasilicone.com\/ru\/silicone-molding-shrinkage-guide\/#Why_Should_Finished_Parts_Be_Measured_Under_Defined_Conditions\" title=\"Why Should Finished Parts Be Measured Under Defined Conditions?\">Why Should Finished Parts Be Measured Under Defined Conditions?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.lyasilicone.com\/ru\/silicone-molding-shrinkage-guide\/#Why_Should_Every_Mold_Cavity_Be_Checked\" title=\"Why Should Every Mold Cavity Be Checked?\">Why Should Every Mold Cavity Be Checked?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.lyasilicone.com\/ru\/silicone-molding-shrinkage-guide\/#Why_Is_the_First_Mold_Trial_Important\" title=\"Why Is the First Mold Trial Important?\">Why Is the First Mold Trial Important?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.lyasilicone.com\/ru\/silicone-molding-shrinkage-guide\/#What_Happens_If_Shrinkage_Is_Ignored_Before_Tooling\" title=\"What Happens If Shrinkage Is Ignored Before Tooling?\">What Happens If Shrinkage Is Ignored Before Tooling?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.lyasilicone.com\/ru\/silicone-molding-shrinkage-guide\/#What_Should_Buyers_Provide_Before_Mold_Compensation_Is_Finalized\" title=\"What Should Buyers Provide Before Mold Compensation Is Finalized?\">What Should Buyers Provide Before Mold Compensation Is Finalized?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.lyasilicone.com\/ru\/silicone-molding-shrinkage-guide\/#Silicone_Shrinkage_DFM_Checklist\" title=\"Silicone Shrinkage DFM Checklist\">Silicone Shrinkage DFM Checklist<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.lyasilicone.com\/ru\/silicone-molding-shrinkage-guide\/#How_LYA_Silicone_Supports_Shrinkage_and_Dimensional_Validation\" title=\"How LYA Silicone Supports Shrinkage and Dimensional Validation\">How LYA Silicone Supports Shrinkage and Dimensional Validation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.lyasilicone.com\/ru\/silicone-molding-shrinkage-guide\/#Frequently_Asked_Questions\" title=\"Frequently Asked Questions\">Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.lyasilicone.com\/ru\/silicone-molding-shrinkage-guide\/#Validate_the_Finished_Product_Not_Only_the_Mold_Drawing\" title=\"Validate the Finished Product, Not Only the Mold Drawing\">Validate the Finished Product, Not Only the Mold Drawing<\/a><\/li><\/ul><\/nav><\/div>\n<h3 class=\"PDq2pG_selectionAnchorContainer\" data-section-id=\"92fswn\" data-start=\"1443\" data-end=\"1461\">Answer Excerpt<\/h3>\n<p data-start=\"1463\" data-end=\"1921\">Silicone molding shrinkage is the dimensional change between the mold cavity and the conditioned finished part. For <a href=\"https:\/\/www.lyasilicone.com\/ru\/\"><strong data-start=\"1579\" data-end=\"1607\">\u0438\u043d\u0434\u0438\u0432\u0438\u0434\u0443\u0430\u043b\u044c\u043d\u044b\u0435 \u0441\u0438\u043b\u0438\u043a\u043e\u043d\u043e\u0432\u044b\u0435 \u0438\u0437\u0434\u0435\u043b\u0438\u044f<\/strong><\/a>, the final amount depends on the selected silicone grade, curing conditions, product geometry, wall thickness and molding process. Buyers should not apply one universal shrinkage percentage. Critical dimensions should be compensated during mold design and then verified with molded samples before mass production.<\/p>\n<p data-start=\"1923\" data-end=\"1999\">A buyer may provide a 3D drawing showing a final diameter of a certain size.<\/p>\n<p data-start=\"2001\" data-end=\"2099\">That does not mean the manufacturer simply machines the mold cavity to exactly the same dimension.<\/p>\n<p data-start=\"2101\" data-end=\"2147\">Silicone products can change dimension during:<\/p>\n<ul data-start=\"2149\" data-end=\"2232\">\n<li data-section-id=\"13avgxu\" data-start=\"2149\" data-end=\"2158\">\u0424\u043e\u0440\u043c\u043e\u0432\u043a\u0430<\/li>\n<li data-section-id=\"1vbska4\" data-start=\"2159\" data-end=\"2167\">Curing<\/li>\n<li data-section-id=\"5zkjd3\" data-start=\"2168\" data-end=\"2177\">Cooling<\/li>\n<li data-section-id=\"1gvqii9\" data-start=\"2178\" data-end=\"2207\">Post-curing, where required<\/li>\n<li data-section-id=\"128jtkr\" data-start=\"2208\" data-end=\"2222\">Conditioning<\/li>\n<li data-section-id=\"1p4gu1d\" data-start=\"2223\" data-end=\"2232\">\u0425\u0440\u0430\u043d\u0435\u043d\u0438\u0435<\/li>\n<\/ul>\n<p data-start=\"2234\" data-end=\"2330\">If these dimensional changes are not considered during tooling, the finished product may become:<\/p>\n<ul data-start=\"2332\" data-end=\"2511\">\n<li data-section-id=\"1iybvc3\" data-start=\"2332\" data-end=\"2343\">Too small<\/li>\n<li data-section-id=\"1ixvim9\" data-start=\"2344\" data-end=\"2355\">Too large<\/li>\n<li data-section-id=\"bqacqj\" data-start=\"2356\" data-end=\"2379\">Difficult to assemble<\/li>\n<li data-section-id=\"1iy94au\" data-start=\"2380\" data-end=\"2391\">Too loose<\/li>\n<li data-section-id=\"1is2blm\" data-start=\"2392\" data-end=\"2403\">Too tight<\/li>\n<li data-section-id=\"3vgqtm\" data-start=\"2404\" data-end=\"2434\">Unable to fit a matching lid<\/li>\n<li data-section-id=\"nd13p5\" data-start=\"2435\" data-end=\"2471\">Inconsistent between mold cavities<\/li>\n<li data-section-id=\"gvgn06\" data-start=\"2472\" data-end=\"2511\">Outside the agreed critical tolerance<\/li>\n<\/ul>\n<p data-start=\"2513\" data-end=\"2636\">For OEM buyers, shrinkage should therefore be reviewed <strong data-start=\"2568\" data-end=\"2593\">before mold machining<\/strong>, not after the first samples already fail.<\/p>\n<hr data-start=\"2638\" data-end=\"2641\" \/>\n<h2 data-section-id=\"90i7zy\" data-start=\"2643\" data-end=\"2681\"><span class=\"ez-toc-section\" id=\"What_Is_Silicone_Molding_Shrinkage\"><\/span>What Is Silicone Molding Shrinkage?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"2683\" data-end=\"2874\">Silicone molding shrinkage describes the difference between the mold-cavity dimensions and the dimensions of the finished molded product after the defined production and conditioning process.<\/p>\n<p data-start=\"2876\" data-end=\"2983\">The mold usually needs dimensional compensation so that the final product reaches the required target size.<\/p>\n<p data-start=\"2985\" data-end=\"3009\">A simplified concept is:<\/p>\n<p data-start=\"3011\" data-end=\"3109\"><strong data-start=\"3011\" data-end=\"3109\">Required finished dimension \u2192 expected material\/process shrinkage \u2192 compensated mold dimension<\/strong><\/p>\n<p data-start=\"3111\" data-end=\"3165\">However, the real engineering process is more complex.<\/p>\n<p data-start=\"3167\" data-end=\"3207\">The manufacturer also needs to consider:<\/p>\n<ul data-start=\"3209\" data-end=\"3368\">\n<li data-section-id=\"r5pkpi\" data-start=\"3209\" data-end=\"3225\">Material grade<\/li>\n<li data-section-id=\"qm4rmd\" data-start=\"3226\" data-end=\"3245\">Product thickness<\/li>\n<li data-section-id=\"862qz0\" data-start=\"3246\" data-end=\"3261\">Product shape<\/li>\n<li data-section-id=\"1ep3h5y\" data-start=\"3262\" data-end=\"3284\">Mold-cavity position<\/li>\n<li data-section-id=\"195c0vx\" data-start=\"3285\" data-end=\"3301\">Molding method<\/li>\n<li data-section-id=\"4pwo73\" data-start=\"3302\" data-end=\"3320\">Curing condition<\/li>\n<li data-section-id=\"s7iq9v\" data-start=\"3321\" data-end=\"3344\">Post-cure requirement<\/li>\n<li data-section-id=\"391rtd\" data-start=\"3345\" data-end=\"3368\">Measurement condition<\/li>\n<\/ul>\n<p data-start=\"3370\" data-end=\"3470\">This is why one shrinkage percentage should not automatically be copied from one project to another.<\/p>\n<hr data-start=\"3472\" data-end=\"3475\" \/>\n<h2 data-section-id=\"hfwhnc\" data-start=\"3477\" data-end=\"3530\"><span class=\"ez-toc-section\" id=\"Why_Is_There_No_Universal_Silicone_Shrinkage_Rate\"><\/span>Why Is There No Universal Silicone Shrinkage Rate?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"3532\" data-end=\"3587\">Different silicone formulations can behave differently.<\/p>\n<p data-start=\"3589\" data-end=\"3870\">Published material data from silicone suppliers shows that linear shrinkage varies between grades rather than remaining one universal value. For example, Shin-Etsu publishes different linear-shrinkage values across its molding silicone grades.<\/p>\n<p data-start=\"3872\" data-end=\"3903\">This means a statement such as:<\/p>\n<blockquote data-start=\"3905\" data-end=\"3937\">\n<p data-start=\"3907\" data-end=\"3937\">Silicone always shrinks by X%.<\/p>\n<\/blockquote>\n<p data-start=\"3939\" data-end=\"3973\">is too simplistic for mold design.<\/p>\n<p data-start=\"3975\" data-end=\"4008\">A previous product may have used:<\/p>\n<ul data-start=\"4010\" data-end=\"4143\">\n<li data-section-id=\"1cjboew\" data-start=\"4010\" data-end=\"4032\">A different hardness<\/li>\n<li data-section-id=\"zvtwki\" data-start=\"4033\" data-end=\"4062\">A different silicone family<\/li>\n<li data-section-id=\"h9i4ag\" data-start=\"4063\" data-end=\"4084\">Different additives<\/li>\n<li data-section-id=\"nrm5l9\" data-start=\"4085\" data-end=\"4112\">A different curing system<\/li>\n<li data-section-id=\"g1jf5z\" data-start=\"4113\" data-end=\"4143\">Different molding conditions<\/li>\n<\/ul>\n<p data-start=\"4145\" data-end=\"4234\">Even when two finished products look similar, the mold compensation may not be identical.<\/p>\n<p data-start=\"4236\" data-end=\"4321\">The material should therefore be confirmed before final mold dimensions are released.<\/p>\n<hr data-start=\"4323\" data-end=\"4326\" \/>\n<h2 data-section-id=\"1cvzi8c\" data-start=\"4328\" data-end=\"4381\"><span class=\"ez-toc-section\" id=\"Why_Does_Product_Geometry_Affect_Final_Dimensions\"><\/span>Why Does Product Geometry Affect Final Dimensions?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"4383\" data-end=\"4443\">Shrinkage should not be treated only as a material property.<\/p>\n<p data-start=\"4445\" data-end=\"4503\">Product geometry also affects how the molded part behaves.<\/p>\n<p data-start=\"4505\" data-end=\"4535\">Consider a product containing:<\/p>\n<ul data-start=\"4537\" data-end=\"4655\">\n<li data-section-id=\"13scnhs\" data-start=\"4537\" data-end=\"4550\">Thick walls<\/li>\n<li data-section-id=\"10mq1p2\" data-start=\"4551\" data-end=\"4563\">Thin walls<\/li>\n<li data-section-id=\"1j4e7wi\" data-start=\"4564\" data-end=\"4570\">Ribs<\/li>\n<li data-section-id=\"16oi4z9\" data-start=\"4571\" data-end=\"4578\">Holes<\/li>\n<li data-section-id=\"1vivybg\" data-start=\"4579\" data-end=\"4597\">A wide flat base<\/li>\n<li data-section-id=\"10gy7ex\" data-start=\"4598\" data-end=\"4614\">A flexible lip<\/li>\n<li data-section-id=\"dg7tsg\" data-start=\"4615\" data-end=\"4630\">Deep textures<\/li>\n<li data-section-id=\"1wbv80d\" data-start=\"4631\" data-end=\"4655\">Reinforcement sections<\/li>\n<\/ul>\n<p data-start=\"4657\" data-end=\"4738\">These areas do not necessarily behave identically after molding and conditioning.<\/p>\n<p data-start=\"4740\" data-end=\"4765\">A product may experience:<\/p>\n<ul data-start=\"4767\" data-end=\"4950\">\n<li data-section-id=\"v70t9f\" data-start=\"4767\" data-end=\"4798\">Overall dimensional reduction<\/li>\n<li data-section-id=\"13v8etq\" data-start=\"4799\" data-end=\"4817\">Local distortion<\/li>\n<li data-section-id=\"8otodb\" data-start=\"4818\" data-end=\"4853\">Ovalization of a circular opening<\/li>\n<li data-section-id=\"8oobem\" data-start=\"4854\" data-end=\"4878\">Warping of a wide base<\/li>\n<li data-section-id=\"su44zh\" data-start=\"4879\" data-end=\"4911\">Different shrinkage directions<\/li>\n<li data-section-id=\"slhfa9\" data-start=\"4912\" data-end=\"4950\">Fit changes around mating components<\/li>\n<\/ul>\n<p data-start=\"4952\" data-end=\"5091\">This is why the engineering team should review the complete 3D structure rather than simply applying one percentage to every CAD dimension.<\/p>\n<hr data-start=\"5093\" data-end=\"5096\" \/>\n<h2 data-section-id=\"1fdujxh\" data-start=\"5098\" data-end=\"5150\"><span class=\"ez-toc-section\" id=\"How_Does_Wall_Thickness_Affect_Shrinkage_Control\"><\/span>How Does Wall Thickness Affect Shrinkage Control?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"5152\" data-end=\"5254\">Wall thickness influences product stiffness, heat transfer, curing behavior and dimensional stability.<\/p>\n<p data-start=\"5256\" data-end=\"5358\">A product with large differences between thick and thin sections can become more difficult to control.<\/p>\n<p data-start=\"5360\" data-end=\"5385\">Potential issues include:<\/p>\n<ul data-start=\"5387\" data-end=\"5497\">\n<li data-section-id=\"1gwggwg\" data-start=\"5387\" data-end=\"5414\">Uneven dimensional change<\/li>\n<li data-section-id=\"7wi7h8\" data-start=\"5415\" data-end=\"5424\">Warping<\/li>\n<li data-section-id=\"5s8zlb\" data-start=\"5425\" data-end=\"5444\">Local deformation<\/li>\n<li data-section-id=\"2q239d\" data-start=\"5445\" data-end=\"5481\">Different recovery after demolding<\/li>\n<li data-section-id=\"1uesaxu\" data-start=\"5482\" data-end=\"5497\">Fit variation<\/li>\n<\/ul>\n<p data-start=\"5499\" data-end=\"5540\">For example, a silicone bowl may contain:<\/p>\n<ul data-start=\"5542\" data-end=\"5652\">\n<li data-section-id=\"1dla4r9\" data-start=\"5542\" data-end=\"5572\">A relatively thick bowl wall<\/li>\n<li data-section-id=\"tmqvyy\" data-start=\"5573\" data-end=\"5602\">A thicker bottom connection<\/li>\n<li data-section-id=\"5vs89a\" data-start=\"5603\" data-end=\"5635\">A thin sealing or suction edge<\/li>\n<li data-section-id=\"10gy22y\" data-start=\"5636\" data-end=\"5652\">A flexible rim<\/li>\n<\/ul>\n<p data-start=\"5654\" data-end=\"5692\">These zones serve different functions.<\/p>\n<p data-start=\"5694\" data-end=\"5849\">During <a href=\"https:\/\/www.lyasilicone.com\/ru\/custom-silicone-mold-development-checklist\/\"><strong data-start=\"5701\" data-end=\"5737\">custom silicone mold development<\/strong><\/a>, the manufacturer should review both wall thickness and the critical finished dimensions before mold machining.<\/p>\n<p data-start=\"5851\" data-end=\"5924\">The goal is not necessarily to make the whole product the same thickness.<\/p>\n<p data-start=\"5926\" data-end=\"6035\">The goal is to avoid unnecessary structural imbalance while compensating the dimensions that affect function.<\/p>\n<hr data-start=\"6037\" data-end=\"6040\" \/>\n<h2 data-section-id=\"1xtzy6g\" data-start=\"6042\" data-end=\"6096\"><span class=\"ez-toc-section\" id=\"Example_Custom_Silicone_Baby_Suction_Bowl_With_Lid\"><\/span>Example: Custom Silicone Baby Suction Bowl With Lid<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"6098\" data-end=\"6236\">A <a href=\"https:\/\/www.lyasilicone.com\/ru\/product\/custom-food-grade-silicone-baby-suction-bowl-with-lid-bpa-free-heat-resistant\/\"><strong data-start=\"6100\" data-end=\"6137\">custom silicone baby suction bowl<\/strong><\/a> is a useful example because the product contains several dimensions that interact with each other.<\/p>\n<p data-start=\"6238\" data-end=\"6268\">A typical project may include:<\/p>\n<ul data-start=\"6270\" data-end=\"6445\">\n<li data-section-id=\"1odxkn4\" data-start=\"6270\" data-end=\"6291\">Bowl outer diameter<\/li>\n<li data-section-id=\"1u0458n\" data-start=\"6292\" data-end=\"6313\">Bowl inner diameter<\/li>\n<li data-section-id=\"1qomnyg\" data-start=\"6314\" data-end=\"6329\">Rim thickness<\/li>\n<li data-section-id=\"n40xup\" data-start=\"6330\" data-end=\"6343\">Bowl height<\/li>\n<li data-section-id=\"zxsenn\" data-start=\"6344\" data-end=\"6367\">Suction-base geometry<\/li>\n<li data-section-id=\"wppz0w\" data-start=\"6368\" data-end=\"6388\">Lid inner diameter<\/li>\n<li data-section-id=\"fc2xsf\" data-start=\"6389\" data-end=\"6401\">Lid groove<\/li>\n<li data-section-id=\"1coeypm\" data-start=\"6402\" data-end=\"6415\">Lid overlap<\/li>\n<li data-section-id=\"1wnax4m\" data-start=\"6416\" data-end=\"6429\">Release tab<\/li>\n<li data-section-id=\"mtwuii\" data-start=\"6430\" data-end=\"6445\">Logo position<\/li>\n<\/ul>\n<p data-start=\"6447\" data-end=\"6618\">LYA&#8217;s current product range includes custom silicone baby suction bowls with lid customization, color, shape and related OEM options.<\/p>\n<p data-start=\"6620\" data-end=\"6711\">Imagine that the bowl and lid are developed separately without proper shrinkage validation.<\/p>\n<p data-start=\"6713\" data-end=\"6738\">Possible results include:<\/p>\n<h3 data-section-id=\"fmioz9\" data-start=\"6740\" data-end=\"6757\">Lid Too Tight<\/h3>\n<p data-start=\"6759\" data-end=\"6806\">The lid may require excessive force to install.<\/p>\n<h3 data-section-id=\"g2x98p\" data-start=\"6808\" data-end=\"6825\">Lid Too Loose<\/h3>\n<p data-start=\"6827\" data-end=\"6878\">The lid may lift easily or fail to stay positioned.<\/p>\n<h3 data-section-id=\"aorzia\" data-start=\"6880\" data-end=\"6905\">Bowl Rim Becomes Oval<\/h3>\n<p data-start=\"6907\" data-end=\"6973\">A flexible circular opening may no longer match the lid uniformly.<\/p>\n<h3 data-section-id=\"1xc9kxc\" data-start=\"6975\" data-end=\"7005\">Suction Base Changes Shape<\/h3>\n<p data-start=\"7007\" data-end=\"7127\">Even if overall diameter is close to the drawing, local warpage can affect how the base contacts the supporting surface.<\/p>\n<p data-start=\"7129\" data-end=\"7214\">This shows why functional fit should be checked together with dimensional inspection.<\/p>\n<p data-start=\"7129\" data-end=\"7214\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-medium wp-image-10991\" src=\"https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/08\/silicone-bowl-lid-shrinkage-fit-comparison.jpg-300x300.jpg\" alt=\"Silicone bowl and lid shrinkage fit comparison\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/08\/silicone-bowl-lid-shrinkage-fit-comparison.jpg-300x300.jpg 300w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/08\/silicone-bowl-lid-shrinkage-fit-comparison.jpg-150x150.jpg 150w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/08\/silicone-bowl-lid-shrinkage-fit-comparison.jpg-768x768.jpg 768w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/08\/silicone-bowl-lid-shrinkage-fit-comparison.jpg-12x12.jpg 12w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/08\/silicone-bowl-lid-shrinkage-fit-comparison.jpg-600x600.jpg 600w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/08\/silicone-bowl-lid-shrinkage-fit-comparison.jpg-100x100.jpg 100w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/08\/silicone-bowl-lid-shrinkage-fit-comparison.jpg.jpg 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<hr data-start=\"7216\" data-end=\"7219\" \/>\n<h2 data-section-id=\"11gtm9k\" data-start=\"7221\" data-end=\"7278\"><span class=\"ez-toc-section\" id=\"Why_Should_Matching_Silicone_Parts_Be_Tested_Together\"><\/span>Why Should Matching Silicone Parts Be Tested Together?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"7280\" data-end=\"7403\">When two components must fit together, buyers should avoid approving each dimension independently without an assembly test.<\/p>\n<p data-start=\"7405\" data-end=\"7422\">Examples include:<\/p>\n<ul data-start=\"7424\" data-end=\"7540\">\n<li data-section-id=\"1s02ihg\" data-start=\"7424\" data-end=\"7436\">Bowl + lid<\/li>\n<li data-section-id=\"t1es10\" data-start=\"7437\" data-end=\"7448\">Cup + lid<\/li>\n<li data-section-id=\"1edh5nx\" data-start=\"7449\" data-end=\"7469\">Straw + straw hole<\/li>\n<li data-section-id=\"1flfuex\" data-start=\"7470\" data-end=\"7486\">Plug + opening<\/li>\n<li data-section-id=\"2w9eee\" data-start=\"7487\" data-end=\"7503\">Case + closure<\/li>\n<li data-section-id=\"1e18krk\" data-start=\"7504\" data-end=\"7540\">Silicone sleeve + mating component<\/li>\n<\/ul>\n<p data-start=\"7542\" data-end=\"7648\">A drawing can define individual <a href=\"https:\/\/www.lyasilicone.com\/ru\/silicone-product-dimensional-tolerance-guide\/\"><strong data-start=\"7574\" data-end=\"7600\">dimensional tolerances<\/strong><\/a>, but actual fit is the final functional result.<\/p>\n<p data-start=\"7650\" data-end=\"7811\">For example, two dimensions may each be technically within tolerance yet combine at opposite ends of their permitted range and create a fit that feels too tight.<\/p>\n<p data-start=\"7813\" data-end=\"7867\">During sample approval, buyers should therefore check:<\/p>\n<ol data-start=\"7869\" data-end=\"8046\">\n<li data-section-id=\"1riyul7\" data-start=\"7869\" data-end=\"7902\">Individual critical dimensions<\/li>\n<li data-section-id=\"w8ofmd\" data-start=\"7903\" data-end=\"7923\">Finished assembly<\/li>\n<li data-section-id=\"1fhmhrr\" data-start=\"7924\" data-end=\"7968\">Insertion or removal force where relevant<\/li>\n<li data-section-id=\"xnitav\" data-start=\"7969\" data-end=\"7989\">Repeated assembly<\/li>\n<li data-section-id=\"1ykjh7e\" data-start=\"7990\" data-end=\"8011\">Recovery after use<\/li>\n<li data-section-id=\"1r2pfu7\" data-start=\"8012\" data-end=\"8046\">Fit after packaging and storage<\/li>\n<\/ol>\n<hr data-start=\"8048\" data-end=\"8051\" \/>\n<h2 data-section-id=\"1swqtap\" data-start=\"8053\" data-end=\"8119\"><span class=\"ez-toc-section\" id=\"Why_Should_Finished_Parts_Be_Measured_Under_Defined_Conditions\"><\/span>Why Should Finished Parts Be Measured Under Defined Conditions?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"8121\" data-end=\"8177\">Flexible silicone is easily deformed during measurement.<\/p>\n<p data-start=\"8179\" data-end=\"8225\">A product can give different results if it is:<\/p>\n<ul data-start=\"8227\" data-end=\"8375\">\n<li data-section-id=\"1e3grfz\" data-start=\"8227\" data-end=\"8239\">Still warm<\/li>\n<li data-section-id=\"1khmsyl\" data-start=\"8240\" data-end=\"8258\">Freshly demolded<\/li>\n<li data-section-id=\"12uwdpn\" data-start=\"8259\" data-end=\"8284\">Compressed by packaging<\/li>\n<li data-section-id=\"inzn9a\" data-start=\"8285\" data-end=\"8304\">Stretched by hand<\/li>\n<li data-section-id=\"1ezio0u\" data-start=\"8305\" data-end=\"8328\">Squeezed by a caliper<\/li>\n<li data-section-id=\"bb66n6\" data-start=\"8329\" data-end=\"8375\">Measured before the agreed conditioning time<\/li>\n<\/ul>\n<p data-start=\"8377\" data-end=\"8434\">This is particularly important when evaluating shrinkage.<\/p>\n<p data-start=\"8436\" data-end=\"8479\">The buyer and manufacturer should agree on:<\/p>\n<ul data-start=\"8481\" data-end=\"8626\">\n<li data-section-id=\"llwy2w\" data-start=\"8481\" data-end=\"8511\">When the product is measured<\/li>\n<li data-section-id=\"l4ceun\" data-start=\"8512\" data-end=\"8533\">Product temperature<\/li>\n<li data-section-id=\"13o32lv\" data-start=\"8534\" data-end=\"8566\">Resting or conditioning period<\/li>\n<li data-section-id=\"1nrax7\" data-start=\"8567\" data-end=\"8586\">Measurement datum<\/li>\n<li data-section-id=\"15miwgv\" data-start=\"8587\" data-end=\"8608\">Measuring equipment<\/li>\n<li data-section-id=\"fap44o\" data-start=\"8609\" data-end=\"8626\">Measuring force<\/li>\n<\/ul>\n<p data-start=\"8628\" data-end=\"8756\">Otherwise, both sides may measure the same sample differently and wrongly conclude that the shrinkage compensation is incorrect.<\/p>\n<hr data-start=\"8758\" data-end=\"8761\" \/>\n<h2 data-section-id=\"1nw2zwy\" data-start=\"8763\" data-end=\"8806\"><span class=\"ez-toc-section\" id=\"Why_Should_Every_Mold_Cavity_Be_Checked\"><\/span>Why Should Every Mold Cavity Be Checked?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"8808\" data-end=\"8911\">In a multi-cavity mold, each cavity should reproduce the same approved product within the agreed range.<\/p>\n<p data-start=\"8913\" data-end=\"8992\">However, cavity-to-cavity variation can still appear because of differences in:<\/p>\n<ul data-start=\"8994\" data-end=\"9087\">\n<li data-section-id=\"14e9tdz\" data-start=\"8994\" data-end=\"9003\">Filling<\/li>\n<li data-section-id=\"ta9u69\" data-start=\"9004\" data-end=\"9013\">Venting<\/li>\n<li data-section-id=\"1xtbspv\" data-start=\"9014\" data-end=\"9038\">Local mold temperature<\/li>\n<li data-section-id=\"41a9ij\" data-start=\"9039\" data-end=\"9057\">Cavity condition<\/li>\n<li data-section-id=\"1lj16sj\" data-start=\"9058\" data-end=\"9069\">Demolding<\/li>\n<li data-section-id=\"u75r0l\" data-start=\"9070\" data-end=\"9087\">Process balance<\/li>\n<\/ul>\n<p data-start=\"9089\" data-end=\"9178\">During mold qualification, samples should therefore remain identifiable by cavity number.<\/p>\n<p data-start=\"9180\" data-end=\"9227\">Critical dimensions should be compared between:<\/p>\n<ul data-start=\"9229\" data-end=\"9309\">\n<li data-section-id=\"125owh5\" data-start=\"9229\" data-end=\"9239\">Cavity 1<\/li>\n<li data-section-id=\"125owh6\" data-start=\"9240\" data-end=\"9250\">Cavity 2<\/li>\n<li data-section-id=\"125owh7\" data-start=\"9251\" data-end=\"9261\">Cavity 3<\/li>\n<li data-section-id=\"125owh8\" data-start=\"9262\" data-end=\"9272\">Cavity 4<\/li>\n<li data-section-id=\"8vh46u\" data-start=\"9273\" data-end=\"9309\">And any additional active cavities<\/li>\n<\/ul>\n<p data-start=\"9311\" data-end=\"9395\">Do not approve a multi-cavity production tool based only on the best-looking sample.<\/p>\n<hr data-start=\"9397\" data-end=\"9400\" \/>\n<h2 data-section-id=\"uhv1hn\" data-start=\"9402\" data-end=\"9443\"><span class=\"ez-toc-section\" id=\"Why_Is_the_First_Mold_Trial_Important\"><\/span>Why Is the First Mold Trial Important?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"9445\" data-end=\"9507\">Material supplier data provides an engineering starting point.<\/p>\n<p data-start=\"9509\" data-end=\"9573\">But actual molded parts confirm how the complete system behaves.<\/p>\n<p data-start=\"9575\" data-end=\"9623\">The first mold trial allows the team to compare:<\/p>\n<p data-start=\"9625\" data-end=\"9705\"><strong data-start=\"9625\" data-end=\"9705\">CAD target \u2192 mold compensation \u2192 molded sample \u2192 conditioned final dimension<\/strong><\/p>\n<p data-start=\"9707\" data-end=\"9751\">Critical dimensions should then be measured.<\/p>\n<p data-start=\"9753\" data-end=\"9778\">Possible results include:<\/p>\n<h3 data-section-id=\"yzicg\" data-start=\"9780\" data-end=\"9814\">Result A: Dimension Is Correct<\/h3>\n<p data-start=\"9816\" data-end=\"9850\">The mold compensation is suitable.<\/p>\n<h3 data-section-id=\"g7fh2u\" data-start=\"9852\" data-end=\"9892\">Result B: Small Adjustment Is Needed<\/h3>\n<p data-start=\"9894\" data-end=\"9935\">A controlled mold correction may be made.<\/p>\n<h3 data-section-id=\"1r6vgs2\" data-start=\"9937\" data-end=\"9989\">Result C: Product Geometry Is Causing Distortion<\/h3>\n<p data-start=\"9991\" data-end=\"10057\">Changing only the cavity dimension may not solve the root problem.<\/p>\n<p data-start=\"10059\" data-end=\"10173\">For example, a wide flexible rim may ovalize because of structural imbalance rather than simple uniform shrinkage.<\/p>\n<p data-start=\"10175\" data-end=\"10269\">Engineering teams should therefore distinguish <strong data-start=\"10222\" data-end=\"10235\">shrinkage<\/strong> \u0441 \u0441\u0430\u0439\u0442\u0430 <strong data-start=\"10241\" data-end=\"10268\">warpage and deformation<\/strong>.<\/p>\n<p data-start=\"10175\" data-end=\"10269\"><img decoding=\"async\" class=\"alignnone size-medium wp-image-10992\" src=\"https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/08\/silicone-shrinkage-sample-dimension-inspection.jpg-300x300.jpg\" alt=\"Silicone shrinkage sample dimensional inspection\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/08\/silicone-shrinkage-sample-dimension-inspection.jpg-300x300.jpg 300w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/08\/silicone-shrinkage-sample-dimension-inspection.jpg-150x150.jpg 150w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/08\/silicone-shrinkage-sample-dimension-inspection.jpg-768x768.jpg 768w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/08\/silicone-shrinkage-sample-dimension-inspection.jpg-12x12.jpg 12w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/08\/silicone-shrinkage-sample-dimension-inspection.jpg-600x600.jpg 600w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/08\/silicone-shrinkage-sample-dimension-inspection.jpg-100x100.jpg 100w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/08\/silicone-shrinkage-sample-dimension-inspection.jpg.jpg 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<hr data-start=\"10271\" data-end=\"10274\" \/>\n<h2 data-section-id=\"vvk41b\" data-start=\"10276\" data-end=\"10331\"><span class=\"ez-toc-section\" id=\"What_Happens_If_Shrinkage_Is_Ignored_Before_Tooling\"><\/span>What Happens If Shrinkage Is Ignored Before Tooling?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"10333\" data-end=\"10395\">Incorrect shrinkage assumptions can create expensive problems.<\/p>\n<p data-start=\"10397\" data-end=\"10414\">Examples include:<\/p>\n<ul data-start=\"10416\" data-end=\"10693\">\n<li data-section-id=\"nutbei\" data-start=\"10416\" data-end=\"10434\">Lid does not fit<\/li>\n<li data-section-id=\"1bhiu0t\" data-start=\"10435\" data-end=\"10459\">Hole becomes too small<\/li>\n<li data-section-id=\"ykhe0v\" data-start=\"10460\" data-end=\"10489\">Product height is incorrect<\/li>\n<li data-section-id=\"12y8qks\" data-start=\"10490\" data-end=\"10518\">Assembly becomes difficult<\/li>\n<li data-section-id=\"1n9oteq\" data-start=\"10519\" data-end=\"10545\">Product capacity changes<\/li>\n<li data-section-id=\"1au970j\" data-start=\"10546\" data-end=\"10572\">Packaging no longer fits<\/li>\n<li data-section-id=\"1h0ve41\" data-start=\"10573\" data-end=\"10607\">Matching accessory becomes loose<\/li>\n<li data-section-id=\"185epuq\" data-start=\"10608\" data-end=\"10636\">Mold requires modification<\/li>\n<li data-section-id=\"1fg28x1\" data-start=\"10637\" data-end=\"10664\">Sampling must be repeated<\/li>\n<li data-section-id=\"1y092se\" data-start=\"10665\" data-end=\"10693\">Launch schedule is delayed<\/li>\n<\/ul>\n<p data-start=\"10695\" data-end=\"10939\">Your existing site already identifies ignoring material-specific shrinkage as a common custom-silicone manufacturing mistake, particularly when a single assumed value is applied to every grade and geometry.<\/p>\n<p data-start=\"10941\" data-end=\"11062\">It is usually easier to review shrinkage before mold machining than to correct several critical dimensions after tooling.<\/p>\n<hr data-start=\"11064\" data-end=\"11067\" \/>\n<h2 data-section-id=\"1ijvf37\" data-start=\"11069\" data-end=\"11137\"><span class=\"ez-toc-section\" id=\"What_Should_Buyers_Provide_Before_Mold_Compensation_Is_Finalized\"><\/span>What Should Buyers Provide Before Mold Compensation Is Finalized?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"11139\" data-end=\"11214\">Buyers should identify which dimensions actually determine product success.<\/p>\n<p data-start=\"11216\" data-end=\"11224\">Provide:<\/p>\n<ul data-start=\"11226\" data-end=\"11451\">\n<li data-section-id=\"x8neb\" data-start=\"11226\" data-end=\"11244\">Final 3D drawing<\/li>\n<li data-section-id=\"eq2hey\" data-start=\"11245\" data-end=\"11273\">2D drawing where available<\/li>\n<li data-section-id=\"k6xhds\" data-start=\"11274\" data-end=\"11295\">Critical dimensions<\/li>\n<li data-section-id=\"u6iocs\" data-start=\"11296\" data-end=\"11315\">Mating components<\/li>\n<li data-section-id=\"1va6mbt\" data-start=\"11316\" data-end=\"11338\">Assembly requirement<\/li>\n<li data-section-id=\"1y169gy\" data-start=\"11339\" data-end=\"11356\">Target material<\/li>\n<li data-section-id=\"i0i11p\" data-start=\"11357\" data-end=\"11374\">Target hardness<\/li>\n<li data-section-id=\"186de8b\" data-start=\"11375\" data-end=\"11400\">Functional requirements<\/li>\n<li data-section-id=\"14k2efc\" data-start=\"11401\" data-end=\"11419\">Packaging method<\/li>\n<li data-section-id=\"uexkpu\" data-start=\"11420\" data-end=\"11451\">Estimated production quantity<\/li>\n<\/ul>\n<p data-start=\"11453\" data-end=\"11536\">If the product fits another component, send the actual matching part when possible.<\/p>\n<p data-start=\"11538\" data-end=\"11683\">For example, when developing a silicone lid for an existing container, the manufacturer should not rely only on a nominal diameter from an email.<\/p>\n<p data-start=\"11685\" data-end=\"11720\">The actual mating geometry matters.<\/p>\n<hr data-start=\"11722\" data-end=\"11725\" \/>\n<h2 data-section-id=\"g3mjo0\" data-start=\"11727\" data-end=\"11762\"><span class=\"ez-toc-section\" id=\"Silicone_Shrinkage_DFM_Checklist\"><\/span>Silicone Shrinkage DFM Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"group TyagGW_tableContainer\">\n<div class=\"TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"11764\" data-end=\"12549\">\n<thead data-start=\"11764\" data-end=\"11801\">\n<tr data-start=\"11764\" data-end=\"11801\">\n<th class=\"last:pe-10\" data-start=\"11764\" data-end=\"11771\" data-col-size=\"sm\">\u0410\u0440\u0442\u0438\u043a\u0443\u043b<\/th>\n<th class=\"last:pe-10\" data-start=\"11771\" data-end=\"11801\" data-col-size=\"md\">What Buyers Should Confirm<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"11812\" data-end=\"12549\">\n<tr data-start=\"11812\" data-end=\"11873\">\n<td data-start=\"11812\" data-end=\"11823\" data-col-size=\"sm\">\u041c\u0430\u0442\u0435\u0440\u0438\u0430\u043b<\/td>\n<td data-start=\"11823\" data-end=\"11873\" data-col-size=\"md\">Final silicone grade identified before tooling<\/td>\n<\/tr>\n<tr data-start=\"11874\" data-end=\"11955\">\n<td data-start=\"11874\" data-end=\"11891\" data-col-size=\"sm\">Shrinkage data<\/td>\n<td data-start=\"11891\" data-end=\"11955\" data-col-size=\"md\">Based on relevant material\/process data, not a generic value<\/td>\n<\/tr>\n<tr data-start=\"11956\" data-end=\"12018\">\n<td data-start=\"11956\" data-end=\"11975\" data-col-size=\"sm\">Product geometry<\/td>\n<td data-start=\"11975\" data-end=\"12018\" data-col-size=\"md\">Thick, thin and flexible areas reviewed<\/td>\n<\/tr>\n<tr data-start=\"12019\" data-end=\"12074\">\n<td data-start=\"12019\" data-end=\"12041\" data-col-size=\"sm\">Critical dimensions<\/td>\n<td data-start=\"12041\" data-end=\"12074\" data-col-size=\"md\">Clearly marked on the drawing<\/td>\n<\/tr>\n<tr data-start=\"12075\" data-end=\"12134\">\n<td data-start=\"12075\" data-end=\"12092\" data-col-size=\"sm\">Matching parts<\/td>\n<td data-start=\"12092\" data-end=\"12134\" data-col-size=\"md\">Functional fit requirements identified<\/td>\n<\/tr>\n<tr data-start=\"12135\" data-end=\"12196\">\n<td data-start=\"12135\" data-end=\"12155\" data-col-size=\"sm\">Mold compensation<\/td>\n<td data-start=\"12155\" data-end=\"12196\" data-col-size=\"md\">Applied to critical cavity dimensions<\/td>\n<\/tr>\n<tr data-start=\"12197\" data-end=\"12257\">\n<td data-start=\"12197\" data-end=\"12218\" data-col-size=\"sm\">Measurement method<\/td>\n<td data-start=\"12218\" data-end=\"12257\" data-col-size=\"md\">Product condition and datum defined<\/td>\n<\/tr>\n<tr data-start=\"12258\" data-end=\"12315\">\n<td data-start=\"12258\" data-end=\"12274\" data-col-size=\"sm\">Mold cavities<\/td>\n<td data-start=\"12274\" data-end=\"12315\" data-col-size=\"md\">Critical dimensions checked by cavity<\/td>\n<\/tr>\n<tr data-start=\"12316\" data-end=\"12365\">\n<td data-start=\"12316\" data-end=\"12332\" data-col-size=\"sm\">First samples<\/td>\n<td data-start=\"12332\" data-end=\"12365\" data-col-size=\"md\">Compared with drawing targets<\/td>\n<\/tr>\n<tr data-start=\"12366\" data-end=\"12414\">\n<td data-start=\"12366\" data-end=\"12377\" data-col-size=\"sm\">Assembly<\/td>\n<td data-start=\"12377\" data-end=\"12414\" data-col-size=\"md\">Matching products tested together<\/td>\n<\/tr>\n<tr data-start=\"12415\" data-end=\"12471\">\n<td data-start=\"12415\" data-end=\"12427\" data-col-size=\"sm\">\u0423\u043f\u0430\u043a\u043e\u0432\u043a\u0430<\/td>\n<td data-start=\"12427\" data-end=\"12471\" data-col-size=\"md\">Does not distort the conditioned product<\/td>\n<\/tr>\n<tr data-start=\"12472\" data-end=\"12549\">\n<td data-start=\"12472\" data-end=\"12491\" data-col-size=\"sm\">Pilot production<\/td>\n<td data-start=\"12491\" data-end=\"12549\" data-col-size=\"md\">Dimensional stability confirmed before full production<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<hr data-start=\"12551\" data-end=\"12554\" \/>\n<h2 data-section-id=\"1ctiqta\" data-start=\"12556\" data-end=\"12621\"><span class=\"ez-toc-section\" id=\"How_LYA_Silicone_Supports_Shrinkage_and_Dimensional_Validation\"><\/span>How LYA Silicone Supports Shrinkage and Dimensional Validation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"12623\" data-end=\"12872\">LYA Silicone supports <a href=\"https:\/\/www.lyasilicone.com\/ru\/oem-service\/\"><strong data-start=\"12645\" data-end=\"12672\">OEM and ODM development<\/strong><\/a> for silicone baby, pet, outdoor and educational products, with current OEM services covering drawings or samples, mold development, sampling and mass production.<\/p>\n<p data-start=\"12874\" data-end=\"12901\">Project review may include:<\/p>\n<ul data-start=\"12903\" data-end=\"13180\">\n<li data-section-id=\"1e6y0uq\" data-start=\"12903\" data-end=\"12919\">Drawing review<\/li>\n<li data-section-id=\"vrp23n\" data-start=\"12920\" data-end=\"12940\">Material selection<\/li>\n<li data-section-id=\"2ris7o\" data-start=\"12941\" data-end=\"12976\">Critical-dimension identification<\/li>\n<li data-section-id=\"1l2cevu\" data-start=\"12977\" data-end=\"13001\">Shrinkage compensation<\/li>\n<li data-section-id=\"e8ns8v\" data-start=\"13002\" data-end=\"13025\">Wall-thickness review<\/li>\n<li data-section-id=\"1ba3nww\" data-start=\"13026\" data-end=\"13039\">Mold design<\/li>\n<li data-section-id=\"bn1yz1\" data-start=\"13040\" data-end=\"13059\">Sample production<\/li>\n<li data-section-id=\"2nszyj\" data-start=\"13060\" data-end=\"13088\">Cavity-specific inspection<\/li>\n<li data-section-id=\"zpollx\" data-start=\"13089\" data-end=\"13102\">Fit testing<\/li>\n<li data-section-id=\"16uwj7v\" data-start=\"13103\" data-end=\"13127\">Dimensional inspection<\/li>\n<li data-section-id=\"1f2uujp\" data-start=\"13128\" data-end=\"13146\">Pilot production<\/li>\n<li data-section-id=\"1db0g2o\" data-start=\"13147\" data-end=\"13180\">Mass-production quality control<\/li>\n<\/ul>\n<p data-start=\"13182\" data-end=\"13325\">Shrinkage should be treated as part of the complete product-development process rather than as a single percentage entered into a mold drawing.<\/p>\n<hr data-start=\"13327\" data-end=\"13330\" \/>\n<h2 data-section-id=\"1r8frcv\" data-start=\"13332\" data-end=\"13361\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-section-id=\"1hr7pr4\" data-start=\"13363\" data-end=\"13414\">Does All Silicone Have the Same Shrinkage Rate?<\/h3>\n<p data-start=\"13416\" data-end=\"13419\">\u041d\u0435\u0442.<\/p>\n<p data-start=\"13421\" data-end=\"13623\">Shrinkage can vary by material grade, formulation, curing system and manufacturing conditions. Supplier technical data should be reviewed for the selected material.<\/p>\n<h3 data-section-id=\"14b7fyo\" data-start=\"13625\" data-end=\"13686\">Is the Mold Always Made Larger Than the Finished Product?<\/h3>\n<p data-start=\"13688\" data-end=\"13854\">Mold dimensions are normally compensated according to the expected finished behavior, but the exact compensation depends on the product, material and molding process.<\/p>\n<h3 data-section-id=\"f46zr9\" data-start=\"13856\" data-end=\"13891\">Does Hardness Affect Shrinkage?<\/h3>\n<p data-start=\"13893\" data-end=\"14022\">Hardness alone should not be used to predict shrinkage. The selected material grade and actual molding system should be reviewed.<\/p>\n<h3 data-section-id=\"qzt0xx\" data-start=\"14024\" data-end=\"14079\">Can Shrinkage Be Different in Different Directions?<\/h3>\n<p data-start=\"14081\" data-end=\"14236\">Complex product geometry can produce different dimensional behavior in different areas or directions, especially when warpage and flexibility are involved.<\/p>\n<h3 data-section-id=\"z3jg0e\" data-start=\"14238\" data-end=\"14299\">Can Shrinkage Be Fixed Only by Changing Machine Settings?<\/h3>\n<p data-start=\"14301\" data-end=\"14312\">Not always.<\/p>\n<p data-start=\"14314\" data-end=\"14448\">If the mold compensation or product geometry is incorrect, process adjustments alone may not achieve the required finished dimensions.<\/p>\n<h3 data-section-id=\"diuvh\" data-start=\"14450\" data-end=\"14507\">Should Shrinkage Be Rechecked During Mass Production?<\/h3>\n<p data-start=\"14509\" data-end=\"14660\">Critical dimensions should remain part of the production inspection plan, especially after mold maintenance, material changes or major process changes.<\/p>\n<hr data-start=\"14662\" data-end=\"14665\" \/>\n<h2 data-section-id=\"crp5j1\" data-start=\"14667\" data-end=\"14726\"><span class=\"ez-toc-section\" id=\"Validate_the_Finished_Product_Not_Only_the_Mold_Drawing\"><\/span>Validate the Finished Product, Not Only the Mold Drawing<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"14728\" data-end=\"14810\">Silicone shrinkage should never be controlled by guessing one standard percentage.<\/p>\n<p data-start=\"14812\" data-end=\"14878\">Reliable dimensional control requires the manufacturer to combine:<\/p>\n<ul data-start=\"14880\" data-end=\"15028\">\n<li data-section-id=\"7a6tzn\" data-start=\"14880\" data-end=\"14895\">Material data<\/li>\n<li data-section-id=\"p131vd\" data-start=\"14896\" data-end=\"14914\">Product geometry<\/li>\n<li data-section-id=\"6f79ns\" data-start=\"14915\" data-end=\"14931\">Wall thickness<\/li>\n<li data-section-id=\"4lprq\" data-start=\"14932\" data-end=\"14951\">Mold compensation<\/li>\n<li data-section-id=\"1yjach0\" data-start=\"14952\" data-end=\"14972\">Sample measurement<\/li>\n<li data-section-id=\"1t6su2k\" data-start=\"14973\" data-end=\"14989\">Functional fit<\/li>\n<li data-section-id=\"pkno06\" data-start=\"14990\" data-end=\"15009\">Cavity inspection<\/li>\n<li data-section-id=\"1f2uujp\" data-start=\"15010\" data-end=\"15028\">Pilot production<\/li>\n<\/ul>\n<p data-start=\"15030\" data-end=\"15125\">Before opening a custom silicone mold, identify which dimensions truly affect fit and function.<\/p>\n<p data-start=\"15127\" data-end=\"15336\">To review shrinkage and dimensional requirements for your custom project, send <a href=\"https:\/\/www.lyasilicone.com\/ru\/contact\/\"><strong data-start=\"15206\" data-end=\"15222\">LYA Silicone<\/strong><\/a> your 3D drawing, critical dimensions, matching components, material requirement, hardness and estimated quantity.<\/p>","protected":false},"excerpt":{"rendered":"<p>Answer Excerpt Silicone molding shrinkage is the dimensional change between the mold cavity and the conditioned finished part. For custom [&hellip;]<\/p>","protected":false},"author":1,"featured_media":10990,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"Silicone Molding Shrinkage Guide for OEM Buyers | LYA","_seopress_titles_desc":"Learn how silicone molding shrinkage affects final dimensions, lid fit, mold compensation, tolerances and production consistency in custom silicone products.","_seopress_robots_index":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[36],"tags":[],"class_list":["post-10986","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.lyasilicone.com\/ru\/wp-json\/wp\/v2\/posts\/10986","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lyasilicone.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lyasilicone.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lyasilicone.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lyasilicone.com\/ru\/wp-json\/wp\/v2\/comments?post=10986"}],"version-history":[{"count":2,"href":"https:\/\/www.lyasilicone.com\/ru\/wp-json\/wp\/v2\/posts\/10986\/revisions"}],"predecessor-version":[{"id":10993,"href":"https:\/\/www.lyasilicone.com\/ru\/wp-json\/wp\/v2\/posts\/10986\/revisions\/10993"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.lyasilicone.com\/ru\/wp-json\/wp\/v2\/media\/10990"}],"wp:attachment":[{"href":"https:\/\/www.lyasilicone.com\/ru\/wp-json\/wp\/v2\/media?parent=10986"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lyasilicone.com\/ru\/wp-json\/wp\/v2\/categories?post=10986"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lyasilicone.com\/ru\/wp-json\/wp\/v2\/tags?post=10986"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}