{"id":15841,"date":"2024-09-23T10:02:41","date_gmt":"2024-09-23T06:32:41","guid":{"rendered":"https:\/\/imenpol.com\/blog\/en\/?p=15841"},"modified":"2025-11-04T11:44:46","modified_gmt":"2025-11-04T08:14:46","slug":"yellowing-in-polyurethane-foam","status":"publish","type":"post","link":"https:\/\/imenpol.com\/blog\/en\/educational\/yellowing-in-polyurethane-foam\/","title":{"rendered":"Yellowing in polyurethane foam"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"15841\" class=\"elementor elementor-15841\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-61edf14 e-flex e-con-boxed e-con e-parent\" data-id=\"61edf14\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7191e04 content-table elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"7191e04\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;headings_by_tags&quot;:[&quot;h2&quot;,&quot;h3&quot;],&quot;container&quot;:&quot;.table-contents&quot;,&quot;exclude_headings_by_selector&quot;:[],&quot;no_headings_message&quot;:&quot;No headings were found on this page.&quot;,&quot;marker_view&quot;:&quot;numbers&quot;,&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<h6 class=\"elementor-toc__header-title\">\n\t\t\t\tTable of contents\t\t\t<\/h6>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__7191e04\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__7191e04\" aria-expanded=\"true\" aria-label=\"Close table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-up\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M240.971 130.524l194.343 194.343c9.373 9.373 9.373 24.569 0 33.941l-22.667 22.667c-9.357 9.357-24.522 9.375-33.901.04L224 227.495 69.255 381.516c-9.379 9.335-24.544 9.317-33.901-.04l-22.667-22.667c-9.373-9.373-9.373-24.569 0-33.941L207.03 130.525c9.372-9.373 24.568-9.373 33.941-.001z\"><\/path><\/svg><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__7191e04\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<svg class=\"elementor-toc__spinner eicon-animation-spin e-font-icon-svg e-eicon-loading\" aria-hidden=\"true\" viewBox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M500 975V858C696 858 858 696 858 500S696 142 500 142 142 304 142 500H25C25 237 238 25 500 25S975 237 975 500 763 975 500 975Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-62d24ad  table-contents e-flex e-con-boxed e-con e-parent\" data-id=\"62d24ad\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a6889dc elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"a6889dc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Almost all polymers are prone to yellowing during processing and use, and the most fundamental reason for yellowing is the instability of polymer structure, which is easily affected by light, oxidation, high temperature and so on. Some polymers are sensitive to light, so light stabilizers are added to the formulation, others are sensitive to oxidation, so antioxidants are used, and yellowing resistance agents may be specific to one or more of them.<\/p><p>The natural color of the foam immediately after production is white; however, the surface region of the foam begins to discolor and turns yellow over time although, it is a completely natural process, <a title=\"polyurethane\" href=\"\/en\/polyurethane\/\" target=\"_blank\" rel=\"noopener\">polyurethane<\/a> going yellow is annoying without a doubt. This discoloration can cause problems with the perception of the quality of the foam although no actual property degradation has occurred.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b59b4ba section pd-0 pb-0 pt-0 e-flex e-con-boxed e-con e-parent\" data-id=\"b59b4ba\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-30ba2fb e-con-full minimal-cta e-flex e-con e-child\" data-id=\"30ba2fb\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-f4cef8e e-con-full e-flex e-con e-child\" data-id=\"f4cef8e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a17816c section-subtitle elementor-widget__width-inherit elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"a17816c\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">After sales service<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a63855a section-title elementor-widget__width-inherit elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"a63855a\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:400}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">For price inquiries and purchasing liquid polyurethane for polyurethane foam production, please contact Imen Polymer Chemie Company.<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-50ce833 elementor-widget__width-initial elementor-absolute elementor-widget elementor-widget-image\" data-id=\"50ce833\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_position&quot;:&quot;absolute&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/imenpol.hinzaco.com\/wp-content\/uploads\/2024\/03\/hexagon-cta.svg\" title=\"\" alt=\"\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6c54e13 e-con-full button-minimal-cta e-flex e-con e-child\" data-id=\"6c54e13\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b65ab51 button elementor-widget elementor-widget-button\" data-id=\"b65ab51\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"\/en\/contact\" target=\"_blank\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Send massage<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8350e8b button elementor-widget elementor-widget-button\" data-id=\"8350e8b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"tel:%20+982157325\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Call Us<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-805216b  table-contents e-flex e-con-boxed e-con e-parent\" data-id=\"805216b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-216124b elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"216124b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><strong>Why does polyurethane foam turn yellow?<\/strong><\/h2>\nThere are various reasons that turn <a title=\"polyurethane foam\" href=\"\/blog\/en\/educational\/what-is-polyurethane-foam\/\" target=\"_blank\" rel=\"noopener\">polyurethane foam<\/a> to yellow, they are as follows:\n<ul>\n \t<li>During processing, the yellowing of thermal oxygen aging (scorching) caused by high temperature<\/li>\n \t<li>By exposure to the air, oxides of nitrogen will cause low oxidization reaction in the backbone of the polymer<\/li>\n \t<li>By exposure to the ultraviolet light (UV), aromatic isocyanate or unsaturated bond for the PU foam, may produce yellow substance due to the light cracking and the ultra violet light is a <a title=\"catalyst\" href=\"\/en\/product\/catalyst\" target=\"_blank\" rel=\"noopener\">catalyst<\/a> for the oxidation process<\/li>\n \t<li>In the presence of compound antioxidant system including butylated hydroxy toluene (BHT), the reaction of the phenolic antioxidant with NO<sub>2<\/sub> resulted in the formation of a quinone methide product (they turn polyurethane foam yellow)<\/li>\n \t<li>The polyurethane structure contains an amino group, which is easily oxidized and yellowed<\/li>\n<\/ul>\nAntioxidants are added to protect the color of a slabstock foam during processing. The foaming reactions are extremely exothermic, and the center of a large block of foam can reach 170\u00a0and remain hot for many hours. Under these conditions, thermal oxidation can yellow or \u2018scorch\u2019 the foam in the center. Antioxidants can reduce scorch, but if the block remains too hot for too long, any antioxidants will be overwhelmed and scorch will still be visible.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0e09f22 e-flex e-con-boxed e-con e-parent\" data-id=\"0e09f22\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7e0fc2a elementor-widget elementor-widget-image\" data-id=\"7e0fc2a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"584\" height=\"438\" src=\"https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2024\/09\/\u0632\u0631\u062f-\u0634\u062f\u06af\u06cc-\u0641\u0648\u0645-\u067e\u0644\u06cc-\u06cc\u0648\u0631\u062a\u0627\u0646.png\" class=\"attachment-full size-full wp-image-15845\" alt=\"polyurethane turned yellow\" srcset=\"https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2024\/09\/\u0632\u0631\u062f-\u0634\u062f\u06af\u06cc-\u0641\u0648\u0645-\u067e\u0644\u06cc-\u06cc\u0648\u0631\u062a\u0627\u0646.png 584w, https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2024\/09\/\u0632\u0631\u062f-\u0634\u062f\u06af\u06cc-\u0641\u0648\u0645-\u067e\u0644\u06cc-\u06cc\u0648\u0631\u062a\u0627\u0646-300x225.png 300w\" sizes=\"(max-width: 584px) 100vw, 584px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2217b10  table-contents e-flex e-con-boxed e-con e-parent\" data-id=\"2217b10\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-90f2bf2 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"90f2bf2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Antioxidants can have both positive and negative effects. As noted above, BHT is a commonly used and volatile antioxidant. When it oxidizes, yellow chromophores, a colored chemical species will be produced in polyurethane foam (PUF); that is why its use in the production of polyols for PUF is being phased out. Oxidation process has originated from reaction with oxides of nitrogen from sources such as air pollution.<\/p><p>Antioxidants\u00a0can be divided into two basic chemical types: amines and phenolics. Amine antioxidants usually discolor with aging and may not be the system of choice for light or brightly colored foams where the appearance of the product matters. Phenolic antioxidants, in contrast to amine antioxidants, do not discolor on aging but are generally less effective in preventing long-term oxidative degradation.<\/p><p>In the manufacturing of polyurethane foam, there\u2019s a reaction between <a title=\"polyol\" href=\"\/en\/product\/polyol\" target=\"_blank\" rel=\"noopener\">polyol<\/a>, an aromatic isocyanate, plus blowing agent. If water used as blowing agent and an amine forms (an isocyanate reacts with water and an amine forms), the resulting aromatic amine is susceptible to oxidation, which forms quinone.\u00a0Quinones\u00a0are yellow, and the continued formation of this compound will result in more yellowing.\u00a0In other words, the quinones only form from aromatic isocyanates. In fact, the yellowing of polyurethane foam is caused by a side reaction to a quinone urethane. Since this side reaction is dependent upon oxygen and ultraviolet light, there are some ways to slow down the phenomenon, as follows:<\/p><ul><li>Using Completely BHT-Free additives<\/li><li>Using light stabilizers or UV absorbers<\/li><li>Using antioxidants<\/li><\/ul><p>It has to be mentioned that unwanted aging processes are one of the most common reasons for material damage in polyurethanes. Causes of this damage are oxidation processes induced by light and\/or heat. Due to its open-pored structure soft polyurethane foam is affected especially often by yellowing.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-89bfb06 section related-products e-flex e-con-boxed e-con e-parent\" data-id=\"89bfb06\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c9e49ed section-subtitle elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"c9e49ed\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-heading-title elementor-size-default\">Some of<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a5990fc section-title elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"a5990fc\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;,&quot;_animation_delay&quot;:500}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Polyurethane Products<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7b2ee22 e-con-full e-flex e-con e-child\" data-id=\"7b2ee22\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-882932a elementor-widget__width-initial related-product elementor-position-top elementor-widget elementor-widget-image-box\" data-id=\"882932a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image-box.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-image-box-wrapper\"><figure class=\"elementor-image-box-img\"><a href=\"\/en\/product\/polyol\/\" target=\"_blank\" tabindex=\"-1\"><img decoding=\"async\" width=\"1200\" height=\"630\" src=\"https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2025\/04\/\u067e\u0644\u06cc-\u0627\u0644-\u0634\u0627\u062e\u0635.jpg\" class=\"attachment-full size-full wp-image-17320\" alt=\"polyol\" srcset=\"https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2025\/04\/\u067e\u0644\u06cc-\u0627\u0644-\u0634\u0627\u062e\u0635.jpg 1200w, https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2025\/04\/\u067e\u0644\u06cc-\u0627\u0644-\u0634\u0627\u062e\u0635-300x158.jpg 300w, https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2025\/04\/\u067e\u0644\u06cc-\u0627\u0644-\u0634\u0627\u062e\u0635-1024x538.jpg 1024w, https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2025\/04\/\u067e\u0644\u06cc-\u0627\u0644-\u0634\u0627\u062e\u0635-768x403.jpg 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/a><\/figure><div class=\"elementor-image-box-content\"><div class=\"elementor-image-box-title\"><a href=\"\/en\/product\/polyol\/\" target=\"_blank\">Polyol<\/a><\/div><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-92c272c elementor-widget__width-initial related-product elementor-position-top elementor-widget elementor-widget-image-box\" data-id=\"92c272c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image-box.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-image-box-wrapper\"><figure class=\"elementor-image-box-img\"><a href=\"\/en\/product\/isocyanate\/\" target=\"_blank\" tabindex=\"-1\"><img decoding=\"async\" width=\"1200\" height=\"630\" src=\"https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2025\/04\/\u0627\u06cc\u0632\u0648\u0633\u06cc\u0627\u0646\u0627\u062a.jpg\" class=\"attachment-full size-full wp-image-17321\" alt=\"Isocyanate\" srcset=\"https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2025\/04\/\u0627\u06cc\u0632\u0648\u0633\u06cc\u0627\u0646\u0627\u062a.jpg 1200w, https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2025\/04\/\u0627\u06cc\u0632\u0648\u0633\u06cc\u0627\u0646\u0627\u062a-300x158.jpg 300w, https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2025\/04\/\u0627\u06cc\u0632\u0648\u0633\u06cc\u0627\u0646\u0627\u062a-1024x538.jpg 1024w, https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2025\/04\/\u0627\u06cc\u0632\u0648\u0633\u06cc\u0627\u0646\u0627\u062a-768x403.jpg 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/a><\/figure><div class=\"elementor-image-box-content\"><div class=\"elementor-image-box-title\"><a href=\"\/en\/product\/isocyanate\/\" target=\"_blank\">Isocyanate<\/a><\/div><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ab74e76 elementor-widget__width-initial related-product elementor-hidden-mobile elementor-position-top elementor-widget elementor-widget-image-box\" data-id=\"ab74e76\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image-box.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-image-box-wrapper\"><figure class=\"elementor-image-box-img\"><a href=\"\/en\/product\/catalyst\/\" target=\"_blank\" tabindex=\"-1\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"630\" src=\"https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2025\/04\/\u06a9\u0627\u062a\u0627\u0644\u06cc\u0633\u062a.jpg\" class=\"attachment-full size-full wp-image-17323\" alt=\"catalyst\" srcset=\"https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2025\/04\/\u06a9\u0627\u062a\u0627\u0644\u06cc\u0633\u062a.jpg 1200w, https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2025\/04\/\u06a9\u0627\u062a\u0627\u0644\u06cc\u0633\u062a-300x158.jpg 300w, https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2025\/04\/\u06a9\u0627\u062a\u0627\u0644\u06cc\u0633\u062a-1024x538.jpg 1024w, https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2025\/04\/\u06a9\u0627\u062a\u0627\u0644\u06cc\u0633\u062a-768x403.jpg 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/a><\/figure><div class=\"elementor-image-box-content\"><div class=\"elementor-image-box-title\"><a href=\"\/en\/product\/catalyst\/\" target=\"_blank\">Catalyst<\/a><\/div><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c1395cb  table-contents e-flex e-con-boxed e-con e-parent\" data-id=\"c1395cb\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-fabad51 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"fabad51\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><strong>Inhibition of yellowing in polyurethane foams<\/strong><\/h2><p>Most designers believe it\u2019s impossible to stop PU foam from discoloring, therefore colorants are added to improve the aesthetic appeal, hide the natural yellowing and give an easy way to tell different foam grades apart. These are supplied as both a pigment and a paste in a low molecular weight for addition into polyol. So, if designers use these colors, they try to mask the discolored foam and it is not a hindrance solution. The only sure way to make non-discoloring foam is to modify formulation with anti-yellowing agents and if possible, changing the storage and using conditions to prevent it from direct exposure to sunlight or air. They not only can effectively solve the yellowing problem by the polyurethane foam from acid gas, light degradation and the processed of high temperature conditions. Moreover, it will not be affected while mixed even it can reach the required of yellowing from manufacturers with the good compatibility.<\/p><p>In conclusion, such yellowing and\/or discoloration problems of polyurethane foam appear to be the result of a combination of factors which can be divided into environmental (external factors) and processing conditions (internal factors). Since in both cases the structure of the polymer has changed, once it happened yellow pigmentation cannot be removed or extracted from the foam.<\/p><p>However, the type of environmental induced color change is different from scorching discoloration resulting from thermal induced degradation and does not have any significant impact on the physical properties of the foam.<\/p><p>Thus, it would be highly desirable to be able to produce such a foam by the addition of a relatively low cost additive have no significant deleterious effect on the resultant foam; that is why anti-yellowing agents are added to the formulation. \u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Almost all polymers are prone to yellowing during processing and use, and the most fundamental reason for yellowing is the instability of polymer structure, which is easily affected by light, oxidation, high temperature and so on. <\/p>\n","protected":false},"author":4,"featured_media":15843,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[85],"class_list":["post-15841","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-educational","tag-polyurethane-foam-articles"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>why does foam turn yellow? 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