{"id":18989,"date":"2024-09-03T09:02:58","date_gmt":"2024-09-03T00:02:58","guid":{"rendered":"https:\/\/askinno.com\/global\/?p=18989"},"modified":"2025-10-26T14:51:46","modified_gmt":"2025-10-26T05:51:46","slug":"yellowed-phone-cases-and-faded-chairs-are-they-really-on-us","status":"publish","type":"post","link":"https:\/\/askinno.com\/global\/archives\/18989","title":{"rendered":"Yellowed phone cases and faded chairs, are they really on us?"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-18995\" src=\"https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_thumb_3_\uba54\uc778_EN.png\" alt=\"\" width=\"1000\" height=\"558\" srcset=\"https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_thumb_3_\uba54\uc778_EN.png 800w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_thumb_3_\uba54\uc778_EN-300x167.png 300w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_thumb_3_\uba54\uc778_EN-768x428.png 768w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_thumb_3_\uba54\uc778_EN-250x139.png 250w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_thumb_3_\uba54\uc778_EN-600x335.png 600w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_thumb_3_\uba54\uc778_EN-700x390.png 700w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_thumb_3_\uba54\uc778_EN-323x180.png 323w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: 'Nanum Gothic', sans-serif; font-size: 13pt;\">You might have bought a sleek, clear phone case that eventually turned dingy yellow, leading you to question if it&#8217;s because of your hands. Or maybe you\u2019ve noticed seats at a sports stadium that look trampled on, causing you to wonder if someone stepped on them and feel uneasy about sitting down. Is it really just poor maintenance that causes plastics to fade? The truth is, there\u2019s more to this than meets the eye\u2014a hidden secret about plastics we often overlook.<\/span><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/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:\/\/askinno.com\/global\/archives\/18989\/#_The_mystery_behind_yellowed_plastics\" >| The mystery behind yellowed plastics<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/askinno.com\/global\/archives\/18989\/#_Why_plastics_lose_their_color_bending_fading_and_more\" >| Why plastics lose their color: bending, fading, and more<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/askinno.com\/global\/archives\/18989\/#_Techniques_to_preserve_plastics_original_hue\" >| Techniques to preserve plastic\u2019s original hue<\/a><\/li><\/ul><\/nav><\/div>\n<h2 style=\"text-align: left;\"><span class=\"ez-toc-section\" id=\"_The_mystery_behind_yellowed_plastics\"><\/span><span style=\"font-size: 15pt;\"><strong><span style=\"font-family: 'Nanum Gothic', sans-serif;\"><span style=\"color: #ff0000;\">|<\/span> The mystery behind yellowed plastics<\/span><\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<figure id=\"attachment_18996\" aria-describedby=\"caption-attachment-18996\" style=\"width: 790px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-wcbig wp-image-18996\" src=\"https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_1-800x463.png\" alt=\"\" width=\"800\" height=\"463\" srcset=\"https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_1-800x463.png 800w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_1-300x174.png 300w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_1-1024x593.png 1024w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_1-768x445.png 768w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_1-250x145.png 250w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_1-600x347.png 600w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_1-700x405.png 700w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_1-311x180.png 311w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_1-1036x600.png 1036w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_1-1209x700.png 1209w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_1.png 1240w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-18996\" class=\"wp-caption-text\">A clean phone case\/mouse vs. a discolored phone case\/mouse<\/figcaption><\/figure>\n<p style=\"text-align: justify;\"><span style=\"font-family: 'Nanum Gothic', sans-serif; font-size: 13pt;\">Many of us have seen plastic &#8220;age&#8221; over time, such as when a clear smartphone case gradually turns yellow. This doesn&#8217;t happen only with TPU (Thermoplastic Polyurethane), the primary material for \u201cgel\u201d phone cases; it also occurs with ABS (Acrylonitrile Butadiene Styrene), which is used in computer keyboards and mice. A once-white keyboard slowly turning yellow is a familiar sight, as these materials naturally change color over time<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-wcbig wp-image-18993\" src=\"https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_2_EN-800x361.png\" alt=\"\" width=\"800\" height=\"361\" srcset=\"https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_2_EN-800x361.png 800w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_2_EN-300x135.png 300w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_2_EN-1024x462.png 1024w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_2_EN-768x347.png 768w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_2_EN-250x113.png 250w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_2_EN-600x271.png 600w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_2_EN-700x316.png 700w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_2_EN-399x180.png 399w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_2_EN.png 1240w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: 'Nanum Gothic', sans-serif; font-size: 13pt;\">One commonly known cause of yellowing is ultraviolet (UV) rays. When plastics are exposed to sunlight, UV rays can alter existing color molecules or create new pigments, leading to discoloration. TPU, in particular, undergoes changes in its molecular structure when exposed to UV rays for extended periods. This process creates red molecules called quinoids, which gradually build up and turn the case yellow. Besides UV rays, prolonged exposure to high temperatures can weaken plastic&#8217;s stability, making it more prone to discoloration. This effect is often seen in electronic devices, where heat breaks down the molecular structure of plastics, causing them to change color over time.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: 'Nanum Gothic', sans-serif; font-size: 13pt;\">Oxidation and contaminants are also key factors in plastic discoloration. Over time, plastics can react with oxygen in the air, leading to oxidative reactions, especially common in older plastics, resulting in yellowing. Additionally, external contaminants like dust and dirt can accumulate on the surface, causing visible discoloration. While cleaning can partially restore the appearance, it can&#8217;t fully bring back the plastic&#8217;s original condition.<\/span><\/p>\n<h2 style=\"text-align: left;\"><span class=\"ez-toc-section\" id=\"_Why_plastics_lose_their_color_bending_fading_and_more\"><\/span><span style=\"font-size: 15pt;\"><strong><span style=\"font-family: 'Nanum Gothic', sans-serif;\"><span style=\"font-size: 15pt;\"><span style=\"color: #ff0000;\">|<\/span> <\/span>Why plastics lose their color: bending, fading, and more<\/span><\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-family: 'Nanum Gothic', sans-serif; font-size: 13pt;\">So, do plastics only turn yellow? Not really\u2014they can also turn white. This \u201cwhitening\u201d phenomenon is common in thermoplastics*.<\/span><br \/>\n<em><span style=\"font-family: 'Nanum Gothic', sans-serif; font-size: 10pt;\">*Thermoplastics, also known as thermosoftening plastics, are high polymers that melt when heated and return to a solid state when sufficiently cooled, making them recyclable<\/span><\/em><\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-wcbig wp-image-18998\" src=\"https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_5-800x361.png\" alt=\"\" width=\"800\" height=\"361\" srcset=\"https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_5-800x361.png 800w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_5-300x135.png 300w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_5-1024x462.png 1024w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_5-768x347.png 768w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_5-250x113.png 250w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_5-600x271.png 600w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_5-700x316.png 700w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_5-399x180.png 399w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_5.png 1240w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: 'Nanum Gothic', sans-serif; font-size: 13pt;\">When thermoplastics are bent or subjected to repeated pressure, their internal polymer structure shifts. These structural changes affect the material\u2019s density and light refraction, causing the plastic to appear white. Think of a chewed-on plastic straw or an old credit card you bend before discarding\u2014the stressed areas invariably turn white.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-wcbig wp-image-18997\" src=\"https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_3-800x361.png\" alt=\"\" width=\"800\" height=\"361\" srcset=\"https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_3-800x361.png 800w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_3-300x135.png 300w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_3-1024x462.png 1024w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_3-768x347.png 768w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_3-250x113.png 250w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_3-600x271.png 600w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_3-700x316.png 700w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_3-399x180.png 399w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_3.png 1240w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: 'Nanum Gothic', sans-serif; font-size: 13pt;\">In addition to external pressure, weathering or sunlight can also cause plastic to whiten. A typical example can be seen in the seats installed in sports stadiums. These plastic chairs are often exposed to intense sunlight for prolonged periods. As a result, UV rays alter the color molecules in the plastic, causing them to lose their original appearance.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: 'Nanum Gothic', sans-serif; font-size: 13pt;\">Moreover, moisture and extreme temperature changes can also trigger whitening. Some plastic materials naturally undergo this process over time. For instance, plastics used in products like cars often turn white due to direct sunlight, temperature fluctuations, and exposure to various pollutants that accelerate the aging process. These common scenarios illustrate how a variety of factors contribute to plastic discoloration.<\/span><\/p>\n<h2 style=\"text-align: left;\"><span class=\"ez-toc-section\" id=\"_Techniques_to_preserve_plastics_original_hue\"><\/span><span style=\"font-size: 15pt;\"><strong><span style=\"font-family: 'Nanum Gothic', sans-serif;\"><span style=\"font-size: 15pt;\"><span style=\"color: #ff0000;\">|<\/span> <\/span>Techniques to preserve plastic\u2019s original hue<\/span><\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-family: 'Nanum Gothic', sans-serif; font-size: 13pt;\">Plastic discoloration isn\u2019t just a cosmetic issue\u2014it can also compromise a product\u2019s performance, making it crucial to preserve and restore the original color of plastics. For instance, in the 1980s, car headlights were primarily made of plastic, but whitening caused by UV exposure reduced light transmission, impairing visibility during night driving and impacting safety. To address this problem, the automotive industry was motivated to improve plastic materials and develop UV-blocking coating technologies. So, what are the current technologies and methods available to prevent or restore plastic discoloration?<\/span><\/p>\n<figure id=\"attachment_18999\" aria-describedby=\"caption-attachment-18999\" style=\"width: 790px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-wcbig wp-image-18999\" src=\"https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/afb56-tpu-case-8-800x500.jpg\" alt=\"\" width=\"800\" height=\"500\" srcset=\"https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/afb56-tpu-case-8-800x500.jpg 800w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/afb56-tpu-case-8-300x188.jpg 300w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/afb56-tpu-case-8-768x480.jpg 768w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/afb56-tpu-case-8-250x156.jpg 250w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/afb56-tpu-case-8-600x375.jpg 600w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/afb56-tpu-case-8-700x438.jpg 700w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/afb56-tpu-case-8-288x180.jpg 288w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/afb56-tpu-case-8-960x600.jpg 960w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/afb56-tpu-case-8.jpg 1024w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-18999\" class=\"wp-caption-text\">Various colors of TPU cases (source: <span style=\"text-decoration: underline;\"><span style=\"color: #0000ff;\"><a style=\"color: #0000ff; text-decoration: underline;\" href=\"https:\/\/blog.easyacc.com\/2016\/04\/29\/tpu-case\/\" target=\"_blank\" rel=\"noopener\">EasyAcc<\/a><\/span><\/span>)<\/figcaption><\/figure>\n<p style=\"text-align: justify;\"><span style=\"font-family: 'Nanum Gothic', sans-serif; font-size: 13pt;\">Various methods have been developed to prevent plastic discoloration. Recently, efforts have focused on creating plastics with UV-blocking layers or incorporating materials that resist discoloration. For example, transparent smartphone cases often use polycarbonate for the back panel, which is relatively resistant to yellowing, while TPU is used only for the edges. In some cases, color is added to the TPU material to minimize noticeable discoloration. Additionally, \u201cUV-blocking layers\u201d and \u201coverheating prevention layers\u201d can be applied to prevent discoloration caused by UV rays and heat generated by smartphones.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: 'Nanum Gothic', sans-serif; font-size: 13pt;\">There are also various ways to restore discolored plastics. For example, if a computer keyboard or mouse has yellowed, applying diluted hydrogen peroxide and exposing it to direct sunlight or a UV lamp can restore its original white color. This method works by utilizing the bleaching effect of hydrogen peroxide, which reacts with the stained molecules on the plastic surface.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-wcbig wp-image-18994\" src=\"https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_4_EN-800x361.png\" alt=\"\" width=\"800\" height=\"361\" srcset=\"https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_4_EN-800x361.png 800w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_4_EN-300x135.png 300w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_4_EN-1024x462.png 1024w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_4_EN-768x347.png 768w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_4_EN-250x113.png 250w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_4_EN-600x271.png 600w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_4_EN-700x316.png 700w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_4_EN-399x180.png 399w, https:\/\/askinno.com\/global\/wp-content\/uploads\/sites\/2\/2024\/09\/\ud504\ub808\uc7780902_img_4_EN.png 1240w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: 'Nanum Gothic', sans-serif; font-size: 13pt;\">Another method to whiten plastic involves using a torch. This technique is applicable for thermoplastics and is commonly used to restore seats in sports stadiums. By carefully applying a hot flame to the discolored seats, the thin UV-damaged surface layer burns away, revealing the intact layer underneath and making the plastic appear as if it has regained its original color.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: 'Nanum Gothic', sans-serif; font-size: 13pt;\">Plastic discoloration can occur for various reasons, but there are many ways to address this issue. Because changes in color can affect both product performance and the user experience, the industry is continuously developing technologies to prevent discoloration and searching for more durable materials. These efforts result in the creation of better products. It\u2019s exciting to think that UV-resistant and fade-proof plastics may soon become a standard part of our everyday lives.<\/span><\/p>\n<div style=\"width: 100%; max-width: 11240px; border: 2px solid #d5d5d5; padding: 5px 0px; line-height: 26px; font-size: 16px;\">\n<div style=\"padding: 0px 10px;\">\n<div style=\"margin-top: 10px; margin-bottom: 10px;\"><span style=\"font-family: 'Nanum Gothic', sans-serif; font-size: 13pt;\"><span style=\"font-family: 'Nanum Gothic', sans-serif; font-size: 13pt;\"><strong>\u25a0 Related articles <\/strong><br \/>\n&#8211;<a href=\"https:\/\/askinno.com\/global\/archives\/18639\" target=\"_blank\" rel=\"noopener\"> Unveil the wonders of starry summer nights with a telescope<\/a><br \/>\n&#8211;<a href=\"https:\/\/askinno.com\/global\/archives\/18571\" target=\"_blank\" rel=\"noopener\"> \u201cFaster, Higher, Stronger!\u201d \u2013 Discover the secrets of high-tech sports gear in Paris<\/a><br \/>\n&#8211;<a href=\"https:\/\/askinno.com\/global\/archives\/18301\" target=\"_blank\" rel=\"noopener\"> A rooftop garden? A tennis court? Why are most rooftops in Korea green?<\/a><\/span><\/span><\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>You might have bought a sleek, clear phone case that eventually turned dingy yellow, leading you to question if it&#8217;s because of your hands. Or maybe you\u2019ve noticed seats at a sports stadium that look trampled on, causing you to wonder if someone stepped on them and feel uneasy about sitting down. 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