{"id":11315,"date":"2026-09-24T02:16:13","date_gmt":"2026-09-24T02:16:13","guid":{"rendered":"https:\/\/www.lyasilicone.com\/?p=11315"},"modified":"2026-09-24T02:16:13","modified_gmt":"2026-09-24T02:16:13","slug":"silicone-whitening-after-stretching-guide","status":"publish","type":"post","link":"https:\/\/www.lyasilicone.com\/fr\/silicone-whitening-after-stretching-guide\/","title":{"rendered":"Why Do Silicone Products Develop White Marks After Stretching? A Guide for OEM Silicone Brands"},"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\">Contenu<\/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\/fr\/silicone-whitening-after-stretching-guide\/#Answer_Excerpt\" title=\"Answer Excerpt\">Answer Excerpt<\/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\/fr\/silicone-whitening-after-stretching-guide\/#Why_Does_Silicone_Turn_White_When_It_Is_Stretched\" title=\"Why Does Silicone Turn White When It Is Stretched?\">Why Does Silicone Turn White When It Is Stretched?<\/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\/fr\/silicone-whitening-after-stretching-guide\/#What_Causes_White_Marks_on_Silicone_Products\" title=\"What Causes White Marks on Silicone Products?\">What Causes White Marks on Silicone Products?<\/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\/fr\/silicone-whitening-after-stretching-guide\/#How_Does_Silicone_Material_Affect_Whitening\" title=\"How Does Silicone Material Affect Whitening?\">How Does Silicone Material Affect Whitening?<\/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\/fr\/silicone-whitening-after-stretching-guide\/#Does_Softer_Silicone_Cause_More_White_Marks\" title=\"Does Softer Silicone Cause More White Marks?\">Does Softer Silicone Cause More White Marks?<\/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\/fr\/silicone-whitening-after-stretching-guide\/#How_Does_Product_Thickness_Influence_Silicone_Whitening\" title=\"How Does Product Thickness Influence Silicone Whitening?\">How Does Product Thickness Influence Silicone Whitening?<\/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\/fr\/silicone-whitening-after-stretching-guide\/#Why_Do_Silicone_Toys_Show_White_Lines_More_Easily\" title=\"Why Do Silicone Toys Show White Lines More Easily?\">Why Do Silicone Toys Show White Lines More Easily?<\/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\/fr\/silicone-whitening-after-stretching-guide\/#Can_Mold_Design_Affect_Silicone_Surface_Whitening\" title=\"Can Mold Design Affect Silicone Surface Whitening?\">Can Mold Design Affect Silicone Surface Whitening?<\/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\/fr\/silicone-whitening-after-stretching-guide\/#How_Does_Surface_Texture_Affect_White_Marks\" title=\"How Does Surface Texture Affect White Marks?\">How Does Surface Texture Affect White Marks?<\/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\/fr\/silicone-whitening-after-stretching-guide\/#Why_Do_Some_Silicone_Products_Recover_After_Stretching\" title=\"Why Do Some Silicone Products Recover After Stretching?\">Why Do Some Silicone Products Recover After Stretching?<\/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\/fr\/silicone-whitening-after-stretching-guide\/#How_Should_OEM_Brands_Test_Silicone_Appearance\" title=\"How Should OEM Brands Test Silicone Appearance?\">How Should OEM Brands Test Silicone Appearance?<\/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\/fr\/silicone-whitening-after-stretching-guide\/#How_Can_Silicone_Whitening_Problems_Be_Reduced\" title=\"How Can Silicone Whitening Problems Be Reduced?\">How Can Silicone Whitening Problems Be Reduced?<\/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\/fr\/silicone-whitening-after-stretching-guide\/#Example_Custom_Silicone_Baby_Product_Development\" title=\"Example: Custom Silicone Baby Product Development\">Example: Custom Silicone Baby Product Development<\/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\/fr\/silicone-whitening-after-stretching-guide\/#What_Should_Brands_Confirm_Before_Mass_Production\" title=\"What Should Brands Confirm Before Mass Production?\">What Should Brands Confirm Before Mass Production?<\/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\/fr\/silicone-whitening-after-stretching-guide\/#How_LYA_Silicone_Supports_Custom_Silicone_Product_Development\" title=\"How LYA Silicone Supports Custom Silicone Product Development\">How LYA Silicone Supports Custom Silicone Product Development<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.lyasilicone.com\/fr\/silicone-whitening-after-stretching-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-17\" href=\"https:\/\/www.lyasilicone.com\/fr\/silicone-whitening-after-stretching-guide\/#Develop_Silicone_Products_With_Stable_Appearance\" title=\"Develop Silicone Products With Stable Appearance\">Develop Silicone Products With Stable Appearance<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"PDq2pG_selectionAnchorContainer\" dir=\"auto\" data-section-id=\"1ewu1tg\" data-start=\"1510\" data-end=\"1527\"><span class=\"ez-toc-section\" id=\"Answer_Excerpt\"><\/span>Answer Excerpt<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"1529\" data-end=\"1783\"><a href=\"https:\/\/www.lyasilicone.com\/fr\/\">Produits en silicone<\/a> may develop temporary or permanent white marks after stretching, bending or repeated deformation. This phenomenon is related to silicone material properties, filler distribution, molding conditions, surface stress and product structure.<\/p>\n<p dir=\"auto\" data-start=\"1785\" data-end=\"1946\">For OEM silicone brands, understanding the causes of whitening helps improve product appearance, durability and production consistency before mass manufacturing.<\/p>\n<hr data-start=\"1948\" data-end=\"1951\" \/>\n<h2 dir=\"auto\" data-section-id=\"z1akv2\" data-start=\"1953\" data-end=\"2006\"><span class=\"ez-toc-section\" id=\"Why_Does_Silicone_Turn_White_When_It_Is_Stretched\"><\/span>Why Does Silicone Turn White When It Is Stretched?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"2008\" data-end=\"2059\">Many silicone products are designed to be flexible.<\/p>\n<p dir=\"auto\" data-start=\"2061\" data-end=\"2078\">Examples include:<\/p>\n<ul data-start=\"2080\" data-end=\"2187\">\n<li data-section-id=\"18eyf80\" data-start=\"2080\" data-end=\"2104\"><a href=\"https:\/\/www.lyasilicone.com\/fr\/categorie-produit\/silicone-baby-products\/\">Produits en silicone pour b\u00e9b\u00e9s<\/a><\/li>\n<li data-section-id=\"gk43c9\" data-start=\"2105\" data-end=\"2128\">Produits en silicone pour animaux de compagnie<\/li>\n<li data-section-id=\"1of0l3i\" data-start=\"2129\" data-end=\"2159\">Silicone outdoor accessories<\/li>\n<li data-section-id=\"10naqfa\" data-start=\"2160\" data-end=\"2187\">Silicone educational toys<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"2189\" data-end=\"2237\">During daily use, these products may experience:<\/p>\n<ul data-start=\"2239\" data-end=\"2285\">\n<li data-section-id=\"1cj9sbr\" data-start=\"2239\" data-end=\"2251\">Stretching<\/li>\n<li data-section-id=\"y5nfbd\" data-start=\"2252\" data-end=\"2261\">Folding<\/li>\n<li data-section-id=\"xc2y2t\" data-start=\"2262\" data-end=\"2271\">Bending<\/li>\n<li data-section-id=\"179v4fa\" data-start=\"2272\" data-end=\"2285\">Compression<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"2287\" data-end=\"2393\">Some customers notice that the silicone surface becomes lighter or develops white lines after deformation.<\/p>\n<p dir=\"auto\" data-start=\"2395\" data-end=\"2444\">This does not always mean the product is damaged.<\/p>\n<p dir=\"auto\" data-start=\"2446\" data-end=\"2508\">However, excessive whitening may indicate problems related to:<\/p>\n<ul data-start=\"2510\" data-end=\"2599\">\n<li data-section-id=\"12bzf01\" data-start=\"2510\" data-end=\"2532\">Material formulation<\/li>\n<li data-section-id=\"qm4rmd\" data-start=\"2533\" data-end=\"2552\">Product thickness<\/li>\n<li data-section-id=\"7nxrhl\" data-start=\"2553\" data-end=\"2575\">Stress concentration<\/li>\n<li data-section-id=\"15eifkf\" data-start=\"2576\" data-end=\"2599\">Manufacturing control<\/li>\n<\/ul>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-medium wp-image-11320\" src=\"https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/09\/silicone-product-stretching-test.jpg-300x300.jpg\" alt=\"Silicone product stretching quality test\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/09\/silicone-product-stretching-test.jpg-300x300.jpg 300w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/09\/silicone-product-stretching-test.jpg-150x150.jpg 150w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/09\/silicone-product-stretching-test.jpg-768x768.jpg 768w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/09\/silicone-product-stretching-test.jpg-12x12.jpg 12w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/09\/silicone-product-stretching-test.jpg-600x600.jpg 600w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/09\/silicone-product-stretching-test.jpg-100x100.jpg 100w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/09\/silicone-product-stretching-test.jpg.jpg 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<hr data-start=\"2601\" data-end=\"2604\" \/>\n<h2 dir=\"auto\" data-section-id=\"ts80ea\" data-start=\"2606\" data-end=\"2654\"><span class=\"ez-toc-section\" id=\"What_Causes_White_Marks_on_Silicone_Products\"><\/span>What Causes White Marks on Silicone Products?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"2656\" data-end=\"2761\">Silicone whitening usually happens because the internal structure changes when the material is stretched.<\/p>\n<p dir=\"auto\" data-start=\"2763\" data-end=\"2788\">The main factors include:<\/p>\n<ul data-start=\"2790\" data-end=\"2908\">\n<li data-section-id=\"2red4l\" data-start=\"2790\" data-end=\"2825\">Silicone material characteristics<\/li>\n<li data-section-id=\"1be09uq\" data-start=\"2826\" data-end=\"2847\">Stress distribution<\/li>\n<li data-section-id=\"a05w8e\" data-start=\"2848\" data-end=\"2867\">Surface condition<\/li>\n<li data-section-id=\"1mm45vn\" data-start=\"2868\" data-end=\"2891\">Manufacturing process<\/li>\n<li data-section-id=\"1aodqkx\" data-start=\"2892\" data-end=\"2908\">Product design<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"2910\" data-end=\"2960\">A silicone product is not only judged by softness.<\/p>\n<p dir=\"auto\" data-start=\"2962\" data-end=\"2984\">It must also maintain:<\/p>\n<ul data-start=\"2986\" data-end=\"3058\">\n<li data-section-id=\"eqp2xi\" data-start=\"2986\" data-end=\"2998\">Appearance<\/li>\n<li data-section-id=\"1wqwdhq\" data-start=\"2999\" data-end=\"3017\">Elastic recovery<\/li>\n<li data-section-id=\"nknm8g\" data-start=\"3018\" data-end=\"3035\">Surface quality<\/li>\n<li data-section-id=\"1vbjvs0\" data-start=\"3036\" data-end=\"3058\">Durabilit\u00e9 \u00e0 long terme<\/li>\n<\/ul>\n<hr data-start=\"3060\" data-end=\"3063\" \/>\n<h2 dir=\"auto\" data-section-id=\"1vwd4se\" data-start=\"3065\" data-end=\"3112\"><span class=\"ez-toc-section\" id=\"How_Does_Silicone_Material_Affect_Whitening\"><\/span>How Does Silicone Material Affect Whitening?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"3114\" data-end=\"3192\">Silicone rubber contains silicone polymer and other components that influence:<\/p>\n<ul data-start=\"3194\" data-end=\"3253\">\n<li data-section-id=\"kv8hm1\" data-start=\"3194\" data-end=\"3206\">Elasticity<\/li>\n<li data-section-id=\"1ls057k\" data-start=\"3207\" data-end=\"3221\">Transparency<\/li>\n<li data-section-id=\"1e9sf8t\" data-start=\"3222\" data-end=\"3232\">Strength<\/li>\n<li data-section-id=\"15mzun7\" data-start=\"3233\" data-end=\"3253\">Surface appearance<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"3255\" data-end=\"3329\">Different silicone formulations can behave differently during deformation.<\/p>\n<p dir=\"auto\" data-start=\"3331\" data-end=\"3384\">A properly selected silicone material should balance:<\/p>\n<ul data-start=\"3386\" data-end=\"3459\">\n<li data-section-id=\"nwj2d1\" data-start=\"3386\" data-end=\"3399\">Flexibility<\/li>\n<li data-section-id=\"1iyy4uh\" data-start=\"3400\" data-end=\"3417\">Tear resistance<\/li>\n<li data-section-id=\"1g3p961\" data-start=\"3418\" data-end=\"3436\">Recovery ability<\/li>\n<li data-section-id=\"t6iy37\" data-start=\"3437\" data-end=\"3459\">Appearance stability<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"3461\" data-end=\"3542\">For OEM products, <a href=\"https:\/\/www.lyasilicone.com\/fr\/how-to-choose-silicone-hardness-custom-products\/\">choosing silicone only based on hardness<\/a> is usually not enough.<\/p>\n<p dir=\"auto\" data-start=\"3544\" data-end=\"3593\">The material should match the actual application.<\/p>\n<hr data-start=\"3595\" data-end=\"3598\" \/>\n<h2 dir=\"auto\" data-section-id=\"6kqzxv\" data-start=\"3600\" data-end=\"3647\"><span class=\"ez-toc-section\" id=\"Does_Softer_Silicone_Cause_More_White_Marks\"><\/span>Does Softer Silicone Cause More White Marks?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"3649\" data-end=\"3665\">Not necessarily.<\/p>\n<p dir=\"auto\" data-start=\"3667\" data-end=\"3698\">Soft silicone usually provides:<\/p>\n<ul data-start=\"3700\" data-end=\"3756\">\n<li data-section-id=\"1liy6ed\" data-start=\"3700\" data-end=\"3720\">Better flexibility<\/li>\n<li data-section-id=\"1jiklec\" data-start=\"3721\" data-end=\"3735\">Softer touch<\/li>\n<li data-section-id=\"i3fqy3\" data-start=\"3736\" data-end=\"3756\">Easier deformation<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"3758\" data-end=\"3866\">However, if the structure requires frequent stretching, excessive softness may increase visible deformation.<\/p>\n<p dir=\"auto\" data-start=\"3868\" data-end=\"3947\">A harder silicone material may reduce surface movement, but it may also affect:<\/p>\n<ul data-start=\"3949\" data-end=\"3998\">\n<li data-section-id=\"hljvc9\" data-start=\"3949\" data-end=\"3966\">Product feeling<\/li>\n<li data-section-id=\"16po99j\" data-start=\"3967\" data-end=\"3984\">User experience<\/li>\n<li data-section-id=\"nwj2d1\" data-start=\"3985\" data-end=\"3998\">Flexibility<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"4000\" data-end=\"4027\">The best choice depends on:<\/p>\n<ul data-start=\"4029\" data-end=\"4109\">\n<li data-section-id=\"862qz0\" data-start=\"4029\" data-end=\"4044\">Product shape<\/li>\n<li data-section-id=\"o8saq1\" data-start=\"4045\" data-end=\"4062\">Usage frequency<\/li>\n<li data-section-id=\"1epwm4c\" data-start=\"4063\" data-end=\"4085\">Expected deformation<\/li>\n<li data-section-id=\"1jixyqo\" data-start=\"4086\" data-end=\"4109\">Customer requirements<\/li>\n<\/ul>\n<hr data-start=\"4111\" data-end=\"4114\" \/>\n<h2 dir=\"auto\" data-section-id=\"198jf2\" data-start=\"4116\" data-end=\"4175\"><span class=\"ez-toc-section\" id=\"How_Does_Product_Thickness_Influence_Silicone_Whitening\"><\/span>How Does Product Thickness Influence Silicone Whitening?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"4177\" data-end=\"4223\">Thickness distribution is an important factor.<\/p>\n<p dir=\"auto\" data-start=\"4225\" data-end=\"4236\">Areas with:<\/p>\n<ul data-start=\"4238\" data-end=\"4319\">\n<li data-section-id=\"ysizbn\" data-start=\"4238\" data-end=\"4263\">Sharp thickness changes<\/li>\n<li data-section-id=\"10wmk77\" data-start=\"4264\" data-end=\"4276\">Thin edges<\/li>\n<li data-section-id=\"1e27jab\" data-start=\"4277\" data-end=\"4292\">Small corners<\/li>\n<li data-section-id=\"cwl67q\" data-start=\"4293\" data-end=\"4319\">Narrow connection points<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"4321\" data-end=\"4364\">may experience higher stress concentration.<\/p>\n<p dir=\"auto\" data-start=\"4366\" data-end=\"4378\">For example:<\/p>\n<p dir=\"auto\" data-start=\"4380\" data-end=\"4493\">A silicone toy with thin connecting sections may show whitening earlier than a product with smoother transitions.<\/p>\n<p dir=\"auto\" data-start=\"4495\" data-end=\"4552\">A well-designed structure distributes stress more evenly.<\/p>\n<hr data-start=\"4554\" data-end=\"4557\" \/>\n<h2 dir=\"auto\" data-section-id=\"zw57rt\" data-start=\"4559\" data-end=\"4612\"><span class=\"ez-toc-section\" id=\"Why_Do_Silicone_Toys_Show_White_Lines_More_Easily\"><\/span>Why Do Silicone Toys Show White Lines More Easily?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"4614\" data-end=\"4672\">Silicone educational toys and baby products often include:<\/p>\n<ul data-start=\"4674\" data-end=\"4737\">\n<li data-section-id=\"sz8y80\" data-start=\"4674\" data-end=\"4695\">Stretching features<\/li>\n<li data-section-id=\"naf9c0\" data-start=\"4696\" data-end=\"4713\">Soft structures<\/li>\n<li data-section-id=\"1djeq6h\" data-start=\"4714\" data-end=\"4737\">Thin connecting areas<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"4739\" data-end=\"4775\">During use, children may repeatedly:<\/p>\n<ul data-start=\"4777\" data-end=\"4799\">\n<li data-section-id=\"1j49lal\" data-start=\"4777\" data-end=\"4783\">Pull<\/li>\n<li data-section-id=\"177lbtx\" data-start=\"4784\" data-end=\"4791\">Twist<\/li>\n<li data-section-id=\"174vvgv\" data-start=\"4792\" data-end=\"4799\">Press<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"4801\" data-end=\"4843\">These actions create repeated deformation.<\/p>\n<p dir=\"auto\" data-start=\"4845\" data-end=\"4873\">Good design should consider:<\/p>\n<ul data-start=\"4875\" data-end=\"4952\">\n<li data-section-id=\"1oskfya\" data-start=\"4875\" data-end=\"4894\">Stretch direction<\/li>\n<li data-section-id=\"1vh58r9\" data-start=\"4895\" data-end=\"4915\">Material thickness<\/li>\n<li data-section-id=\"fk9fb\" data-start=\"4916\" data-end=\"4937\">Rounded transitions<\/li>\n<li data-section-id=\"70xgqk\" data-start=\"4938\" data-end=\"4952\">Stress areas<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"4954\" data-end=\"4978\">before <a href=\"https:\/\/www.lyasilicone.com\/fr\/custom-silicone-mold-development-checklist\/\">mold development<\/a>.<\/p>\n<hr data-start=\"4980\" data-end=\"4983\" \/>\n<h2 dir=\"auto\" data-section-id=\"peeh95\" data-start=\"4985\" data-end=\"5038\"><span class=\"ez-toc-section\" id=\"Can_Mold_Design_Affect_Silicone_Surface_Whitening\"><\/span>Can Mold Design Affect Silicone Surface Whitening?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"5040\" data-end=\"5044\">Oui.<\/p>\n<p dir=\"auto\" data-start=\"5046\" data-end=\"5106\">The molding process influences the final silicone structure.<\/p>\n<p dir=\"auto\" data-start=\"5108\" data-end=\"5134\">Important factors include:<\/p>\n<ul data-start=\"5136\" data-end=\"5240\">\n<li data-section-id=\"aw8nqc\" data-start=\"5136\" data-end=\"5160\">Mold surface condition<\/li>\n<li data-section-id=\"3818do\" data-start=\"5161\" data-end=\"5179\">Material filling<\/li>\n<li data-section-id=\"v71g5f\" data-start=\"5180\" data-end=\"5201\">Temperature control<\/li>\n<li data-section-id=\"q6zksq\" data-start=\"5202\" data-end=\"5220\">Pressure control<\/li>\n<li data-section-id=\"doq2i4\" data-start=\"5221\" data-end=\"5240\">Curing conditions<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"5242\" data-end=\"5276\">Poor process stability may create:<\/p>\n<ul data-start=\"5278\" data-end=\"5362\">\n<li data-section-id=\"1srna1h\" data-start=\"5278\" data-end=\"5305\">Uneven material structure<\/li>\n<li data-section-id=\"k2ile4\" data-start=\"5306\" data-end=\"5325\">Surface variation<\/li>\n<li data-section-id=\"z79m1u\" data-start=\"5326\" data-end=\"5362\">Different elasticity between areas<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"5364\" data-end=\"5464\">For custom silicone products, stable production conditions are important for appearance consistency.<\/p>\n<hr data-start=\"5466\" data-end=\"5469\" \/>\n<h2 dir=\"auto\" data-section-id=\"1aqt0hb\" data-start=\"5471\" data-end=\"5518\"><span class=\"ez-toc-section\" id=\"How_Does_Surface_Texture_Affect_White_Marks\"><\/span>How Does Surface Texture Affect White Marks?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"5520\" data-end=\"5577\">Surface texture changes how light reflects from silicone.<\/p>\n<p dir=\"auto\" data-start=\"5579\" data-end=\"5631\">Different finishes may show deformation differently.<\/p>\n<p dir=\"auto\" data-start=\"5633\" data-end=\"5645\">For example:<\/p>\n<p dir=\"auto\" data-start=\"5647\" data-end=\"5663\">Smooth surfaces:<\/p>\n<ul data-start=\"5665\" data-end=\"5698\">\n<li data-section-id=\"jf9tdm\" data-start=\"5665\" data-end=\"5698\">Show color changes more clearly<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"5700\" data-end=\"5718\">Textured surfaces:<\/p>\n<ul data-start=\"5720\" data-end=\"5742\">\n<li data-section-id=\"ycn158\" data-start=\"5720\" data-end=\"5742\">May hide minor marks<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"5744\" data-end=\"5778\">However, deep textures may affect:<\/p>\n<ul data-start=\"5780\" data-end=\"5830\">\n<li data-section-id=\"bb6lsd\" data-start=\"5780\" data-end=\"5790\">Cleaning<\/li>\n<li data-section-id=\"eqp2xi\" data-start=\"5791\" data-end=\"5803\">Appearance<\/li>\n<li data-section-id=\"wwz4cb\" data-start=\"5804\" data-end=\"5830\">Manufacturing difficulty<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"5832\" data-end=\"5908\">Surface design should consider both visual requirements and practical usage.<\/p>\n<hr data-start=\"5910\" data-end=\"5913\" \/>\n<h2 dir=\"auto\" data-section-id=\"1in1hzm\" data-start=\"5915\" data-end=\"5973\"><span class=\"ez-toc-section\" id=\"Why_Do_Some_Silicone_Products_Recover_After_Stretching\"><\/span>Why Do Some Silicone Products Recover After Stretching?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"5975\" data-end=\"6009\">Silicone has excellent elasticity.<\/p>\n<p dir=\"auto\" data-start=\"6011\" data-end=\"6092\">After releasing external force, many products can return to their original shape.<\/p>\n<p dir=\"auto\" data-start=\"6094\" data-end=\"6143\">Temporary whitening may disappear after recovery.<\/p>\n<p dir=\"auto\" data-start=\"6145\" data-end=\"6161\">This depends on:<\/p>\n<ul data-start=\"6163\" data-end=\"6246\">\n<li data-section-id=\"101mnu6\" data-start=\"6163\" data-end=\"6181\">Material quality<\/li>\n<li data-section-id=\"g0xjjo\" data-start=\"6182\" data-end=\"6201\">Deformation level<\/li>\n<li data-section-id=\"1srm4vq\" data-start=\"6202\" data-end=\"6221\">Product structure<\/li>\n<li data-section-id=\"15tk7np\" data-start=\"6222\" data-end=\"6246\">Production consistency<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"6248\" data-end=\"6331\">However, permanent whitening may indicate excessive stress or material limitations.<\/p>\n<hr data-start=\"6333\" data-end=\"6336\" \/>\n<h2 dir=\"auto\" data-section-id=\"1yyvo4c\" data-start=\"6338\" data-end=\"6388\"><span class=\"ez-toc-section\" id=\"How_Should_OEM_Brands_Test_Silicone_Appearance\"><\/span>How Should OEM Brands Test Silicone Appearance?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"6390\" data-end=\"6437\">Before mass production, brands should evaluate:<\/p>\n<h3 dir=\"auto\" data-section-id=\"1kcg7q7\" data-start=\"6439\" data-end=\"6455\">Stretch Test<\/h3>\n<p dir=\"auto\" data-start=\"6457\" data-end=\"6497\">Apply controlled stretching and observe:<\/p>\n<ul data-start=\"6499\" data-end=\"6548\">\n<li data-section-id=\"9pi6z7\" data-start=\"6499\" data-end=\"6513\">Color change<\/li>\n<li data-section-id=\"qu2m9n\" data-start=\"6514\" data-end=\"6529\">Surface marks<\/li>\n<li data-section-id=\"1g3p961\" data-start=\"6530\" data-end=\"6548\">Recovery ability<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"135ts72\" data-start=\"6551\" data-end=\"6571\">Compression Test<\/h3>\n<p dir=\"auto\" data-start=\"6573\" data-end=\"6612\">Check whether repeated pressing causes:<\/p>\n<ul data-start=\"6614\" data-end=\"6654\">\n<li data-section-id=\"1ktxk54\" data-start=\"6614\" data-end=\"6637\">Permanent deformation<\/li>\n<li data-section-id=\"18mx4bf\" data-start=\"6638\" data-end=\"6654\">Surface change<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"93p1vh\" data-start=\"6657\" data-end=\"6673\">Bending Test<\/h3>\n<p dir=\"auto\" data-start=\"6675\" data-end=\"6707\">Evaluate flexible areas such as:<\/p>\n<ul data-start=\"6709\" data-end=\"6758\">\n<li data-section-id=\"j2650x\" data-start=\"6709\" data-end=\"6718\">Handles<\/li>\n<li data-section-id=\"xed9e1\" data-start=\"6719\" data-end=\"6734\">Thin sections<\/li>\n<li data-section-id=\"1pudbzk\" data-start=\"6735\" data-end=\"6758\">Connecting structures<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"jz81k6\" data-start=\"6761\" data-end=\"6786\">Appearance Inspection<\/h3>\n<p dir=\"auto\" data-start=\"6788\" data-end=\"6794\">Check:<\/p>\n<ul data-start=\"6796\" data-end=\"6854\">\n<li data-section-id=\"1ynyb17\" data-start=\"6796\" data-end=\"6815\">Color consistency<\/li>\n<li data-section-id=\"1pcnrsr\" data-start=\"6816\" data-end=\"6833\">Surface defects<\/li>\n<li data-section-id=\"1go28bb\" data-start=\"6834\" data-end=\"6854\">Texture uniformity<\/li>\n<\/ul>\n<hr data-start=\"6856\" data-end=\"6859\" \/>\n<h2 dir=\"auto\" data-section-id=\"1t00gx8\" data-start=\"6861\" data-end=\"6911\"><span class=\"ez-toc-section\" id=\"How_Can_Silicone_Whitening_Problems_Be_Reduced\"><\/span>How Can Silicone Whitening Problems Be Reduced?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"6913\" data-end=\"6931\">Solutions include:<\/p>\n<h3 dir=\"auto\" data-section-id=\"xxaz6c\" data-start=\"6933\" data-end=\"6964\">Optimize Material Selection<\/h3>\n<p dir=\"auto\" data-start=\"6966\" data-end=\"6995\">Choose silicone according to:<\/p>\n<ul data-start=\"6997\" data-end=\"7066\">\n<li data-section-id=\"3l9z1d\" data-start=\"6997\" data-end=\"7015\">Product function<\/li>\n<li data-section-id=\"115n1je\" data-start=\"7016\" data-end=\"7041\">Flexibility requirement<\/li>\n<li data-section-id=\"8ahydn\" data-start=\"7042\" data-end=\"7066\">Durability expectation<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"60vhk2\" data-start=\"7069\" data-end=\"7098\">Improve Product Structure<\/h3>\n<p dir=\"auto\" data-start=\"7100\" data-end=\"7106\">Avoid:<\/p>\n<ul data-start=\"7108\" data-end=\"7173\">\n<li data-section-id=\"31koo6\" data-start=\"7108\" data-end=\"7134\">Sudden thickness changes<\/li>\n<li data-section-id=\"3zwfyc\" data-start=\"7135\" data-end=\"7150\">Sharp corners<\/li>\n<li data-section-id=\"i021di\" data-start=\"7151\" data-end=\"7173\">Excessive thin areas<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"7nc2x0\" data-start=\"7176\" data-end=\"7199\">Improve Mold Design<\/h3>\n<p dir=\"auto\" data-start=\"7201\" data-end=\"7208\">Review:<\/p>\n<ul data-start=\"7210\" data-end=\"7261\">\n<li data-section-id=\"3l2335\" data-start=\"7210\" data-end=\"7227\">Filling balance<\/li>\n<li data-section-id=\"15baeha\" data-start=\"7228\" data-end=\"7244\">Surface finish<\/li>\n<li data-section-id=\"1hjwivo\" data-start=\"7245\" data-end=\"7261\">Mold precision<\/li>\n<\/ul>\n<h3 dir=\"auto\" data-section-id=\"1upqcc8\" data-start=\"7264\" data-end=\"7297\">Control Production Parameters<\/h3>\n<p dir=\"auto\" data-start=\"7299\" data-end=\"7323\">Maintain consistency in:<\/p>\n<ul data-start=\"7325\" data-end=\"7363\">\n<li data-section-id=\"1f3vflw\" data-start=\"7325\" data-end=\"7338\">Temp\u00e9rature<\/li>\n<li data-section-id=\"1od8urx\" data-start=\"7339\" data-end=\"7349\">Pressure<\/li>\n<li data-section-id=\"1rlb22h\" data-start=\"7350\" data-end=\"7363\">Curing time<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"alignnone size-medium wp-image-11321\" src=\"https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/09\/silicone-product-design-optimization.jpg-300x300.jpg\" alt=\"Silicone product design optimization for OEM\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/09\/silicone-product-design-optimization.jpg-300x300.jpg 300w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/09\/silicone-product-design-optimization.jpg-150x150.jpg 150w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/09\/silicone-product-design-optimization.jpg-768x768.jpg 768w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/09\/silicone-product-design-optimization.jpg-12x12.jpg 12w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/09\/silicone-product-design-optimization.jpg-600x600.jpg 600w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/09\/silicone-product-design-optimization.jpg-100x100.jpg 100w, https:\/\/www.lyasilicone.com\/wp-content\/uploads\/2026\/09\/silicone-product-design-optimization.jpg.jpg 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<hr data-start=\"7365\" data-end=\"7368\" \/>\n<h2 dir=\"auto\" data-section-id=\"1h8xtng\" data-start=\"7370\" data-end=\"7422\"><span class=\"ez-toc-section\" id=\"Example_Custom_Silicone_Baby_Product_Development\"><\/span>Example: Custom Silicone Baby Product Development<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"7424\" data-end=\"7468\">A silicone baby feeding product may include:<\/p>\n<ul data-start=\"7470\" data-end=\"7525\">\n<li data-section-id=\"1svi5b7\" data-start=\"7470\" data-end=\"7491\">Soft body structure<\/li>\n<li data-section-id=\"416n87\" data-start=\"7492\" data-end=\"7509\">Flexible handle<\/li>\n<li data-section-id=\"n5p5ej\" data-start=\"7510\" data-end=\"7525\">Rounded edges<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"7527\" data-end=\"7605\">If the handle area is too thin, repeated pulling may create visible whitening.<\/p>\n<p dir=\"auto\" data-start=\"7607\" data-end=\"7620\">By adjusting:<\/p>\n<ul data-start=\"7622\" data-end=\"7673\">\n<li data-section-id=\"1kfygu\" data-start=\"7622\" data-end=\"7633\">Thickness<\/li>\n<li data-section-id=\"1n5gozj\" data-start=\"7634\" data-end=\"7653\">Radius transition<\/li>\n<li data-section-id=\"p1kx87\" data-start=\"7654\" data-end=\"7673\">Material hardness<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"7675\" data-end=\"7735\">the product can maintain better appearance during daily use.<\/p>\n<p dir=\"auto\" data-start=\"7737\" data-end=\"7783\">The goal is not simply making silicone softer.<\/p>\n<p dir=\"auto\" data-start=\"7785\" data-end=\"7827\">The goal is creating a balanced structure.<\/p>\n<hr data-start=\"7829\" data-end=\"7832\" \/>\n<h2 dir=\"auto\" data-section-id=\"1t8oz2t\" data-start=\"7834\" data-end=\"7887\"><span class=\"ez-toc-section\" id=\"What_Should_Brands_Confirm_Before_Mass_Production\"><\/span>What Should Brands Confirm Before Mass Production?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"7889\" data-end=\"7934\">Before production, OEM buyers should confirm:<\/p>\n<ul data-start=\"7936\" data-end=\"8104\">\n<li data-section-id=\"lrk0o3\" data-start=\"7936\" data-end=\"7960\">Silicone material type<\/li>\n<li data-section-id=\"6pbw77\" data-start=\"7961\" data-end=\"7983\">Hardness requirement<\/li>\n<li data-section-id=\"kf2g8e\" data-start=\"7984\" data-end=\"8000\">Color standard<\/li>\n<li data-section-id=\"qm4rmd\" data-start=\"8001\" data-end=\"8020\">Product thickness<\/li>\n<li data-section-id=\"70xgqk\" data-start=\"8021\" data-end=\"8035\">Stress areas<\/li>\n<li data-section-id=\"1dwnq13\" data-start=\"8036\" data-end=\"8059\">Stretching conditions<\/li>\n<li data-section-id=\"sryj3l\" data-start=\"8060\" data-end=\"8082\">Surface requirements<\/li>\n<li data-section-id=\"a5ebu5\" data-start=\"8083\" data-end=\"8104\">Inspection standard<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"8106\" data-end=\"8183\">Clear communication before tooling helps avoid expensive modifications later.<\/p>\n<hr data-start=\"8185\" data-end=\"8188\" \/>\n<h2 dir=\"auto\" data-section-id=\"1qd4guu\" data-start=\"8190\" data-end=\"8254\"><span class=\"ez-toc-section\" id=\"How_LYA_Silicone_Supports_Custom_Silicone_Product_Development\"><\/span>How LYA Silicone Supports Custom Silicone Product Development<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"8256\" data-end=\"8302\">LYA Silicone provides <a href=\"https:\/\/www.lyasilicone.com\/fr\/oem-service\/\">OEM and ODM support<\/a> for:<\/p>\n<ul data-start=\"8304\" data-end=\"8412\">\n<li data-section-id=\"18eyf80\" data-start=\"8304\" data-end=\"8328\">Produits en silicone pour b\u00e9b\u00e9s<\/li>\n<li data-section-id=\"gk43c9\" data-start=\"8329\" data-end=\"8352\"><a href=\"https:\/\/www.lyasilicone.com\/fr\/categorie-produit\/silicone-pet-products\/\">Produits en silicone pour animaux de compagnie<\/a><\/li>\n<li data-section-id=\"1sbkfzk\" data-start=\"8353\" data-end=\"8380\">Silicone outdoor products<\/li>\n<li data-section-id=\"sluzhr\" data-start=\"8381\" data-end=\"8412\">Silicone educational products<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"8414\" data-end=\"8447\">The development process includes:<\/p>\n<ul data-start=\"8449\" data-end=\"8560\">\n<li data-section-id=\"19j6hqb\" data-start=\"8449\" data-end=\"8469\">Product discussion<\/li>\n<li data-section-id=\"by5atc\" data-start=\"8470\" data-end=\"8485\">Design review<\/li>\n<li data-section-id=\"vnvfht\" data-start=\"8486\" data-end=\"8504\">Mold development<\/li>\n<li data-section-id=\"1xdfdgh\" data-start=\"8505\" data-end=\"8526\">Sample confirmation<\/li>\n<li data-section-id=\"16pv9wr\" data-start=\"8527\" data-end=\"8539\">Production<\/li>\n<li data-section-id=\"y6rpqz\" data-start=\"8540\" data-end=\"8560\">Quality inspection<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"8562\" data-end=\"8710\">By considering material, structure and manufacturing together, brands can develop silicone products with stable appearance and reliable performance.<\/p>\n<hr data-start=\"8712\" data-end=\"8715\" \/>\n<h2 dir=\"auto\" data-section-id=\"1r8frcv\" data-start=\"8717\" data-end=\"8746\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 dir=\"auto\" data-section-id=\"1gvmpka\" data-start=\"8748\" data-end=\"8798\">Is silicone whitening after stretching normal?<\/h3>\n<p dir=\"auto\" data-start=\"8800\" data-end=\"8912\">Temporary whitening can occur because silicone changes under stress. Permanent marks require further evaluation.<\/p>\n<h3 dir=\"auto\" data-section-id=\"1wp1u2z\" data-start=\"8914\" data-end=\"8963\">Can silicone whitening be completely avoided?<\/h3>\n<p dir=\"auto\" data-start=\"8965\" data-end=\"9067\">The risk can be reduced through proper material selection, design optimization and production control.<\/p>\n<h3 dir=\"auto\" data-section-id=\"9ry4p8\" data-start=\"9069\" data-end=\"9116\">Does silicone hardness determine whitening?<\/h3>\n<p dir=\"auto\" data-start=\"9118\" data-end=\"9226\">Hardness affects behavior, but it is only one factor. Structure and material formulation are also important.<\/p>\n<h3 dir=\"auto\" data-section-id=\"19f360y\" data-start=\"9228\" data-end=\"9280\">Are white marks a sign of poor silicone quality?<\/h3>\n<p dir=\"auto\" data-start=\"9282\" data-end=\"9357\">Not always. The cause depends on material, stress level and product design.<\/p>\n<hr data-start=\"9359\" data-end=\"9362\" \/>\n<h2 dir=\"auto\" data-section-id=\"1h6it2t\" data-start=\"9364\" data-end=\"9415\"><span class=\"ez-toc-section\" id=\"Develop_Silicone_Products_With_Stable_Appearance\"><\/span>Develop Silicone Products With Stable Appearance<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"auto\" data-start=\"9417\" data-end=\"9469\">Silicone products need more than attractive designs.<\/p>\n<p dir=\"auto\" data-start=\"9471\" data-end=\"9528\">Successful OEM development requires coordination between:<\/p>\n<ul data-start=\"9530\" data-end=\"9629\">\n<li data-section-id=\"vrp23n\" data-start=\"9530\" data-end=\"9550\">Material selection<\/li>\n<li data-section-id=\"1srm4vq\" data-start=\"9551\" data-end=\"9570\">Product structure<\/li>\n<li data-section-id=\"1ba3nww\" data-start=\"9571\" data-end=\"9584\">Mold design<\/li>\n<li data-section-id=\"15eifkf\" data-start=\"9585\" data-end=\"9608\">Manufacturing control<\/li>\n<li data-section-id=\"y6rpqz\" data-start=\"9609\" data-end=\"9629\">Quality inspection<\/li>\n<\/ul>\n<p dir=\"auto\" data-start=\"9631\" data-end=\"9746\">For custom silicone product projects, LYA Silicone helps brands transform ideas into stable mass-produced products.<\/p>\n<p dir=\"auto\" data-start=\"9748\" data-end=\"9817\"><a href=\"https:\/\/www.lyasilicone.com\/fr\/contact\/\">Contactez nous<\/a> to discuss your silicone product development requirements.<\/p>","protected":false},"excerpt":{"rendered":"<p>Answer Excerpt Silicone products may develop temporary or permanent white marks after stretching, bending or repeated deformation. This phenomenon is [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":11319,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"Silicone Whitening After Stretching: Causes and Solutions for OEM Products | LYA","_seopress_titles_desc":"Learn why silicone products develop white marks after stretching, bending or compression. 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