{"id":9513,"date":"2026-01-29T04:32:05","date_gmt":"2026-01-29T04:32:05","guid":{"rendered":"https:\/\/changhongchemical.com\/?p=9513"},"modified":"2026-04-27T11:16:12","modified_gmt":"2026-04-27T11:16:12","slug":"how-to-choose-a-uv-absorber","status":"publish","type":"post","link":"https:\/\/changhongchemical.com\/pt\/how-to-choose-a-uv-absorber\/","title":{"rendered":"Como escolher um absorvedor de UV?"},"content":{"rendered":"<h1><strong>Como escolher um absorvedor de UV?<\/strong><\/h1>\n<p>Voc\u00ea j\u00e1 notou que as cadeiras de pl\u00e1stico deixadas ao lado da janela por muito tempo ficam quebradi\u00e7as e racham, ou que o revestimento das grades externas fica manchado e desbotado? Isso acontece porque a luz ultravioleta (UV) est\u00e1 silenciosamente \"decompondo\" os materiais. <a href=\"https:\/\/changhongchemical.com\/\">Absorvedores de UV<\/a> s\u00e3o como um \"protetor solar invis\u00edvel\" projetado especificamente para materiais polim\u00e9ricos. Eles absorvem os raios UV prejudiciais da luz solar e os convertem em calor inofensivo, protegendo assim pl\u00e1sticos, revestimentos, borracha e outros materiais contra \"queimaduras solares\" e envelhecimento.<\/p>\n<p>A escolha do \"protetor solar\" correto \u00e9 fundamental. Ele precisa atender a v\u00e1rias condi\u00e7\u00f5es essenciais: forte absor\u00e7\u00e3o dos raios UV nocivos na faixa de 290 a 400 nm, resist\u00eancia ao processamento em alta temperatura, boa compatibilidade com o material, al\u00e9m de ser est\u00e1vel, seguro e n\u00e3o lixiviar. Materiais diferentes exigem prote\u00e7\u00e3o \"protetora\" diferente. A seguir, analisaremos v\u00e1rios tipos principais de absorvedores de UV e veremos o que cada um \u00e9 mais adequado para proteger.<\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-9516\" src=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2026\/01\/UV-Absorber-2.webp\" alt=\"Absorvedor de UV-2\" width=\"3462\" height=\"1699\" srcset=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2026\/01\/UV-Absorber-2.webp 3462w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2026\/01\/UV-Absorber-2-768x377.webp 768w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2026\/01\/UV-Absorber-2-1536x754.webp 1536w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2026\/01\/UV-Absorber-2-2048x1005.webp 2048w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2026\/01\/UV-Absorber-2-18x9.webp 18w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2026\/01\/UV-Absorber-2-1280x628.webp 1280w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2026\/01\/UV-Absorber-2-600x294.webp 600w\" sizes=\"(max-width: 3462px) 100vw, 3462px\" \/><\/p>\n<h3><strong>Categoria 1: Compostos \u00e0 base de benzofenona (mais comumente usados, ampla gama de aplica\u00e7\u00f5es)<\/strong><\/h3>\n<p>Esse tipo de absorvedor de UV \u00e9 o mais amplamente utilizado. Suas principais caracter\u00edsticas s\u00e3o a boa compatibilidade e a excelente resist\u00eancia ao calor. A maioria deles pode ser usada em produtos de cor clara ou transparentes, o que os torna o \"protetor solar padr\u00e3o\" nos setores de pl\u00e1sticos e revestimentos.<\/p>\n<h3><strong>2,4-Dihidroxibenzofenona<\/strong><\/h3>\n<p>Apresenta-se como cristais em forma de agulha de cor clara ou p\u00f3 branco, quase insol\u00favel em \u00e1gua, mas facilmente sol\u00favel em solventes org\u00e2nicos, como acetona e etanol. Ele pode absorver luz ultravioleta com comprimento de onda de 280 a 340 nm, tem uma ampla gama de aplica\u00e7\u00f5es e pode ser usado em v\u00e1rios materiais, como cloreto de polivinila, poliestireno, resina ep\u00f3xi, revestimentos e borracha sint\u00e9tica. A quantidade de adi\u00e7\u00e3o convencional \u00e9 de 0,1%-1%. Uma desvantagem \u00e9 que seu efeito de estabiliza\u00e7\u00e3o de luz n\u00e3o \u00e9 excepcional e, normalmente, precisa ser usado em combina\u00e7\u00e3o com outros aditivos.<\/p>\n<h3><strong>- 2-Hidroxi-4-metoxibenzofenona (UV-9)<\/strong><\/h3>\n<p>P\u00f3 cristalino amarelo-claro ou branco, inodoro, com boa resist\u00eancia ao calor (n\u00e3o se decomp\u00f5e a 200\u00b0C) e quase n\u00e3o absorve luz vis\u00edvel, o que o torna especialmente adequado para produtos pl\u00e1sticos transparentes e de cores claras. \u00c9 facilmente sol\u00favel na maioria dos solventes org\u00e2nicos, insol\u00favel em \u00e1gua e pode absorver luz ultravioleta de 280 a 340 nm. \u00c9 adequado para cloreto de polivinila, polimetilmetacrilato (plexiglass), resina ABS, resina de celulose, etc., com uma quantidade de adi\u00e7\u00e3o de 0,1%-1,5%. Tamb\u00e9m pode ser usado em tintas e borracha sint\u00e9tica. Tem alta seguran\u00e7a e, em alguns pa\u00edses, a quantidade m\u00e1xima de adi\u00e7\u00e3o \u00e9 limitada a 0,3% quando usado em produtos que entram em contato com alimentos.<\/p>\n<h3><strong>- 2-Hidroxi-4-n-octiloxibenzofenona (UV-531)<\/strong><\/h3>\n<p>P\u00f3 cristalino amarelo-claro ou branco com baixa densidade e baixa volatilidade. Tem excelente compatibilidade com v\u00e1rios pl\u00e1sticos e absorve fortemente a luz ultravioleta de 270 a 330 nm. \u00c9 adequado principalmente para polietileno, polipropileno, poliestireno, resina ABS, policarbonato etc., com uma quantidade de adi\u00e7\u00e3o de 0,1%-1%. Quando usado com antioxidantes, o efeito de prote\u00e7\u00e3o solar \u00e9 significativamente melhorado. Tem toxicidade muito baixa e v\u00e1rios pa\u00edses permitem seu uso em produtos pl\u00e1sticos que entram em contato com alimentos (como recipientes de polietileno e polipropileno), com limites de uso espec\u00edficos para diferentes materiais (0,2%-1%).<\/p>\n<h3><strong>Categoria 3: \u00c9steres de salicilato (alto custo-benef\u00edcio, adequado para pl\u00e1sticos de baixo custo)<\/strong><\/h3>\n<p>Esses absorvedores de UV s\u00e3o baratos e est\u00e3o prontamente dispon\u00edveis, mas t\u00eam uma faixa estreita de comprimento de onda de absor\u00e7\u00e3o e oferecem prote\u00e7\u00e3o solar moderada. Eles s\u00e3o usados principalmente em produtos pl\u00e1sticos que n\u00e3o exigem alta resist\u00eancia a intemp\u00e9ries, o que os torna uma \"op\u00e7\u00e3o econ\u00f4mica de prote\u00e7\u00e3o solar\".<\/p>\n<h3><strong>1. Salicilato de fenila<\/strong><\/h3>\n<p>Um p\u00f3 cristalino incolor com um leve aroma de \u00f3leo de gault\u00e9ria, facilmente sol\u00favel em solventes org\u00e2nicos, como \u00e9ter e benzeno, e quase insol\u00favel em \u00e1gua e glicerol. Ele tem uma faixa estreita de comprimento de onda de absor\u00e7\u00e3o e \u00e9 usado principalmente em produtos pl\u00e1sticos devido \u00e0 sua alta rela\u00e7\u00e3o custo-benef\u00edcio. Aprovado pela Food and Drug Administration (FDA) dos EUA para uso em produtos de resina acr\u00edlica que entram em contato com alimentos (como utens\u00edlios de mesa de acr\u00edlico).<\/p>\n<h3><strong>2. Monobenzoato de resorcinol<\/strong><\/h3>\n<p>A white crystalline powder, slightly soluble in water and benzene, and easily soluble in acetone and ethanol. Its sun protection performance is similar to that of <a href=\"https:\/\/changhongchemical.com\/product\/photoinitiator-bp-cas-119-61-9\/\">benzofenona<\/a> derivatives. Mainly used in polyvinyl chloride, cellulose resins, and polystyrene, with a typical addition amount of 1%-2%. Suitable for low-end products where cost is a concern and high weather resistance is not required.\u3002<\/p>\n<h3><strong>Categoria 4: Outros tipos especiais (adaptados a cen\u00e1rios espec\u00edficos)<\/strong><\/h3>\n<p>Essa categoria de <a href=\"https:\/\/changhongchemical.com\/\">Absorvedores de UV<\/a> tem faixas de absor\u00e7\u00e3o especiais ou diferentes mecanismos de a\u00e7\u00e3o e \u00e9 usado principalmente para materiais ou cen\u00e1rios espec\u00edficos com requisitos especiais, o que os torna altamente direcionados.<\/p>\n<h3><strong>1. Produto da rea\u00e7\u00e3o de o-Nitroanilina e p-Cresol<\/strong><\/h3>\n<p>Cristais incolores ou amarelo-claros, insol\u00faveis em \u00e1gua, facilmente sol\u00faveis em solventes org\u00e2nicos, como gasolina, benzeno e acetona, e n\u00e3o s\u00e3o facilmente decompostos por \u00e1cidos ou bases concentrados. Absorve luz UV em 270-280 nm (um comprimento de onda relativamente \u00fanico). \u00c9 usado principalmente em resinas como poli\u00e9ster, poli\u00e9ster clorado, acetato de celulose, cloreto de polivinila e poliacrilonitrila. Sua estabilidade em produtos transparentes \u00e9 melhor do que em produtos coloridos, com uma quantidade de adi\u00e7\u00e3o de 0,1%-0,5%.<\/p>\n<h3><strong>2. 2,2\u2032-Thiobis(4-tert-octylphenoxy)nickel (Complexo de n\u00edquel)<\/strong><\/h3>\n<p>P\u00f3 verde, adequado principalmente para materiais de poliolefina, como polietileno e polipropileno. Ele \u00e9 particularmente eficaz na prote\u00e7\u00e3o de filmes e fibras pl\u00e1sticas contra danos causados por raios UV e tamb\u00e9m pode melhorar o desempenho de processamento do material. Quando usado em combina\u00e7\u00e3o com outros absorvedores de UV, o efeito de prote\u00e7\u00e3o solar \u00e9 significativamente aprimorado. No entanto, suas desvantagens incluem a cor escura, que pode colorir o produto, e a possibilidade de tornar o produto preto-acinzentado em altas temperaturas. Ele tamb\u00e9m \u00e9 t\u00f3xico, exigindo cuidado extra durante o uso.<\/p>\n<h3><strong>3. Fosfito de tris(1,2,2,6,6-pentametilpiperidinil) (amina impedida)<\/strong><\/h3>\n<p>P\u00f3 branco cristalino, facilmente sol\u00favel em solventes org\u00e2nicos, moderadamente sol\u00favel em \u00e1gua e tem boa compatibilidade com poliolefinas. Sua caracter\u00edstica exclusiva \u00e9 que ele n\u00e3o absorve a luz UV, mas pode capturar os radicais livres ativos gerados durante a degrada\u00e7\u00e3o do material. Sua efic\u00e1cia de prote\u00e7\u00e3o solar \u00e9 de 2 a 4 vezes maior que a dos absorvedores de UV convencionais e tamb\u00e9m pode melhorar a resist\u00eancia do material ao envelhecimento oxidativo t\u00e9rmico. Adequado para pl\u00e1sticos como polietileno e polipropileno, tem baixa toxicidade, mas baixa resist\u00eancia ao calor. A temperatura de processamento n\u00e3o deve exceder 270\u00b0C, e n\u00e3o \u00e9 adequado para uso prolongado em \u00e1gua quente.<\/p>\n<h3><strong>4. 4-Benzoiloxi-2,2,6,6-tetrametilpiperidina (amina impedida)<\/strong><\/h3>\n<p>P\u00f3 cristalino branco, com boa resist\u00eancia ao calor (temperatura de decomposi\u00e7\u00e3o acima de 280 \u2103), insol\u00favel em \u00e1gua e facilmente sol\u00favel em solventes org\u00e2nicos, como tolueno e acetona.  Seu mecanismo de a\u00e7\u00e3o \u00e9 semelhante ao anterior; ele n\u00e3o absorve diretamente a luz ultravioleta, mas elimina com efici\u00eancia os radicais livres ativos, proporcionando um efeito de prote\u00e7\u00e3o solar v\u00e1rias vezes superior ao dos produtos convencionais. \u00c9 compat\u00edvel com v\u00e1rios pl\u00e1sticos, como polipropileno, polietileno, poliestireno e poliamida, e \u00e9 especialmente adequado para produtos de poliolefina. N\u00e3o causa colora\u00e7\u00e3o nem polui\u00e7\u00e3o e apresenta excelentes efeitos sin\u00e9rgicos quando usado em combina\u00e7\u00e3o com antioxidantes e absorvedores de UV.<\/p>\n<h3><strong>5. 2,4,6-Tris(2\u2032-n-butoxy-phenyl)-1,3,5-triazine<\/strong><\/h3>\n<p>Light yellow powder, slightly soluble in n-butanol, insoluble in water, and absorbs ultraviolet light in the 300-380nm range. Its sun protection performance is superior to benzophenone-based UV-9 and <a href=\"https:\/\/changhongchemical.com\/product\/lcsorb-uv-531-cas-1843-05-6\/\">UV-531<\/a>. It is suitable for plastics such as polyvinyl chloride, polyoxymethylene, and chlorinated polyether, with an addition amount not exceeding 1%. Its drawbacks include slight discoloration, causing the product to have a light yellow tint, and poor compatibility with some resins.\u3002<\/p>\n<h3><strong>6. Hexametilfosforamida<\/strong><\/h3>\n<p>L\u00edquido transparente, incolor ou amarelo-claro, com odor levemente de peixe e adstringente, \u00e9 misc\u00edvel com a maioria dos plastificantes e solventes e \u00e9 conhecido como um \"agente resistente a intemp\u00e9ries altamente eficaz para cloreto de polivinila\". Quando adicionado a filmes de cloreto de polivinila (2 a 5 partes), ele n\u00e3o apenas melhora significativamente a resist\u00eancia a intemp\u00e9ries e ao frio, mas tamb\u00e9m reduz a temperatura de processamento em aproximadamente 10\u00b0C. Al\u00e9m disso, ele tamb\u00e9m pode ser usado como um excelente solvente para pol\u00edmeros como poliamida, poliuretano e sulfeto de polifenileno, tornando suas aplica\u00e7\u00f5es ainda mais abrangentes.<\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-9515\" src=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2026\/01\/UV-Absorber-1.webp\" alt=\"Absorvedor de UV lcsorb\" width=\"3462\" height=\"1699\" srcset=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2026\/01\/UV-Absorber-1.webp 3462w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2026\/01\/UV-Absorber-1-768x377.webp 768w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2026\/01\/UV-Absorber-1-1536x754.webp 1536w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2026\/01\/UV-Absorber-1-2048x1005.webp 2048w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2026\/01\/UV-Absorber-1-18x9.webp 18w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2026\/01\/UV-Absorber-1-1280x628.webp 1280w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2026\/01\/UV-Absorber-1-600x294.webp 600w\" sizes=\"(max-width: 3462px) 100vw, 3462px\" \/><\/p>\n<h3><strong>Conclus\u00e3o: O valor principal e as t\u00e9cnicas de sele\u00e7\u00e3o dos absorvedores de UV<\/strong><\/h3>\n<p>Em resumo,<a href=\"https:\/\/changhongchemical.com\/\"> Absorvedores de UV<\/a> s\u00e3o o \"segredo da longevidade\" dos materiais polim\u00e9ricos.  Seja em utens\u00edlios de mesa e carca\u00e7as de eletrodom\u00e9sticos do dia a dia, seja em tubos e revestimentos pl\u00e1sticos para ambientes externos, sua prote\u00e7\u00e3o \u00e9 indispens\u00e1vel. Ao escolher, n\u00e3o h\u00e1 necessidade de buscar cegamente o \"alto desempenho\"; a chave \u00e9 combinar o material e o cen\u00e1rio de aplica\u00e7\u00e3o: para poliolefinas (polietileno, polipropileno), os tipos de benzotriazol ou amina impedida s\u00e3o os preferidos; para produtos transparentes\/claro-claros, os tipos de benzofenona (UV-9, UV-531) s\u00e3o os preferidos; para produtos de baixo custo, os tipos de salicilato podem ser usados; e para produtos em contato com alimentos, \u00e9 necess\u00e1rio seguir rigorosamente os limites de dosagem.<\/p>\n<p>Com o desenvolvimento do setor de materiais, os absorvedores de UV tamb\u00e9m est\u00e3o se aprimorando em dire\u00e7\u00e3o \u00e0 \"alta efici\u00eancia, baixa toxicidade e ampla compatibilidade\". No futuro, eles atender\u00e3o melhor \u00e0s necessidades de prote\u00e7\u00e3o solar de v\u00e1rios materiais, protegendo todos os produtos de pol\u00edmero em nossas vidas, prolongando sua vida \u00fatil e mantendo seu excelente desempenho.<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Have you ever noticed that plastic chairs left by the window for a long time become brittle and crack, or that the coating on outdoor railings becomes mottled and faded? This is because ultraviolet&#8230;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[143],"tags":[],"class_list":["post-9513","post","type-post","status-publish","format-standard","hentry","category-uv-light-curing-series"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Choose a UV Absorber?- Changhong Chemical<\/title>\n<meta name=\"description\" content=\"Have you ever noticed that plastic chairs left by the window for a long time become brittle and crack, and the coating on outdoor railings becomes patchy and faded? Behind this phenomenon, ultraviolet (UV) radiation is silently &quot;degrading&quot; the materials. UV absorbers are essentially &quot;invisible sunscreens&quot; specifically designed for polymer materials. They absorb harmful UV rays from sunlight and convert them into harmless heat, thus protecting plastics, coatings, rubber, and other materials from &quot;sunburn&quot; and aging.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/changhongchemical.com\/pt\/how-to-choose-a-uv-absorber\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Choose a UV Absorber?- Changhong Chemical\" \/>\n<meta property=\"og:description\" content=\"Have you ever noticed that plastic chairs left by the window for a long time become brittle and crack, and the coating on outdoor railings becomes patchy and faded? Behind this phenomenon, ultraviolet (UV) radiation is silently &quot;degrading&quot; the materials. UV absorbers are essentially &quot;invisible sunscreens&quot; specifically designed for polymer materials. They absorb harmful UV rays from sunlight and convert them into harmless heat, thus protecting plastics, coatings, rubber, and other materials from &quot;sunburn&quot; and aging.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/changhongchemical.com\/pt\/how-to-choose-a-uv-absorber\/\" \/>\n<meta property=\"og:site_name\" content=\"Changhong Chemical\" \/>\n<meta property=\"article:published_time\" content=\"2026-01-29T04:32:05+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-27T11:16:12+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2026\/01\/UV-Absorber-2.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"3462\" \/>\n\t<meta property=\"og:image:height\" content=\"1699\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Changhong Chemical\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Changhong Chemical\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/how-to-choose-a-uv-absorber\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/how-to-choose-a-uv-absorber\\\/\"},\"author\":{\"name\":\"Changhong Chemical\",\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/#\\\/schema\\\/person\\\/2a9593ff69d6db8f8ca0567ca3ed6b5d\"},\"headline\":\"How to Choose a UV Absorber?\",\"datePublished\":\"2026-01-29T04:32:05+00:00\",\"dateModified\":\"2026-04-27T11:16:12+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/how-to-choose-a-uv-absorber\\\/\"},\"wordCount\":1401,\"publisher\":{\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/how-to-choose-a-uv-absorber\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/changhongchemical.com\\\/wp-content\\\/uploads\\\/2026\\\/01\\\/UV-Absorber-2.webp\",\"articleSection\":[\"UV light curing series\"],\"inLanguage\":\"pt-BR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/how-to-choose-a-uv-absorber\\\/\",\"url\":\"https:\\\/\\\/changhongchemical.com\\\/how-to-choose-a-uv-absorber\\\/\",\"name\":\"How to Choose a UV Absorber?- Changhong Chemical\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/how-to-choose-a-uv-absorber\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/changhongchemical.com\\\/how-to-choose-a-uv-absorber\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/changhongchemical.com\\\/wp-content\\\/uploads\\\/2026\\\/01\\\/UV-Absorber-2.webp\",\"datePublished\":\"2026-01-29T04:32:05+00:00\",\"dateModified\":\"2026-04-27T11:16:12+00:00\",\"description\":\"Have you ever noticed that plastic chairs left by the window for a long time become brittle and crack, and the coating on outdoor railings becomes patchy and faded? Behind this phenomenon, ultraviolet (UV) radiation is silently \\\"degrading\\\" the materials. UV absorbers are essentially \\\"invisible sunscreens\\\" specifically designed for polymer materials. 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