{"id":12131,"date":"2026-04-14T08:49:02","date_gmt":"2026-04-14T08:49:02","guid":{"rendered":"https:\/\/ideal-pro.com\/?p=12131"},"modified":"2026-04-14T09:01:41","modified_gmt":"2026-04-14T09:01:41","slug":"why-do-plastic-colored-products-fade-a-deep-dive-into-color-stability","status":"publish","type":"post","link":"https:\/\/ideal-pro.com\/ja\/why-do-plastic-colored-products-fade-a-deep-dive-into-color-stability\/","title":{"rendered":"Why Do Plastic Colored Products Fade? A Deep Dive into Color Stability"},"content":{"rendered":"

Why Do Plastic Colored Products Fade? A Deep Dive into Color Stability<\/h1>\n

Have you ever wondered why some plastic products lose their vibrant color over time while others stay bright for years? The fading of plastic coloring products is a complex issue influenced by multiple factors.<\/p>\n

Generally, the colorfastness of a plastic product depends on the lightfastness, antioxidant properties, heat resistance, and acid\/alkali resistance<\/strong> of the colorants, as well as the characteristics of the resin used.<\/p>\n

Below is a detailed analysis of the four primary factors causing plastic coloring to fade.<\/p>\n

\"Why<\/p>\n

\n

1. Lightfastness of Colorants<\/h3>\n

The lightfastness of a colorant directly dictates the longevity of a product's color. This is especially critical for outdoor products exposed to strong light.<\/p>\n

    \n
  • The Problem:<\/strong> If the lightfastness rating is poor, the product will fade quickly during use. Ultraviolet (UV) rays can also trigger changes in the molecular structure of the carrier resin, leading to fading.<\/li>\n
  • The Solution:<\/strong> Adding UV absorbers and other light stabilizers to the masterbatch can significantly improve the lightfastness of both the colorant and the plastic product.<\/li>\n<\/ul>\n

    Recommended Lightfastness Ratings:<\/strong><\/p>\n\n\n\n\n\n\n
    Application Environment<\/th>\nRecommended Lightfastness Rating<\/th>\nNotes<\/th>\n<\/tr>\n<\/thead>\n
    Outdoor \/ Weather-resistant<\/strong><\/td>\nLevel 7 - 8<\/strong><\/td>\nIdeally Level 7 or 8; minimum Level 6.<\/td>\n<\/tr>\n
    Indoor Use<\/strong><\/td>\nLevel 4 - 5<\/strong><\/td>\nSufficient for environments without direct sunlight.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    \n

    💡 Pro Tip:<\/strong> Always check the lightfastness等级 (rating) of your pigment. For outdoor durability, never compromise on a Level 6 minimum.<\/p>\n<\/blockquote>\n

    \n

    2. Heat Resistance<\/h3>\n

    Heat stability refers to the degree to which a pigment loses weight, changes color, or fades at processing temperatures.<\/p>\n

      \n
    • Inorganic Pigments:<\/strong> Composed of metal oxides and salts, these generally possess excellent thermal stability.<\/li>\n
    • Organic Pigments:<\/strong> These are more sensitive. At specific temperatures, their molecular structures can change or decompose.<\/li>\n<\/ul>\n

      This is particularly crucial for engineering plastics like PP (Polypropylene), PA (Nylon), and PET<\/strong>, which have processing temperatures exceeding 280°C<\/strong>. When selecting colorants for these resins, you must consider both the temperature limit and the residence time<\/strong> (typically 4–10 minutes).<\/p>\n

      \n

      3. Antioxidant Properties<\/h3>\n

      Oxidation is a silent killer of color vibrancy. Certain organic pigments fade gradually after undergoing macromolecular degradation due to oxidation.<\/p>\n

      This process occurs in two main ways:<\/p>\n

        \n
      1. High-temperature oxidation<\/strong> during the processing phase.<\/li>\n
      2. Chemical oxidation<\/strong> when encountering strong oxidizing agents (e.g., chromate radicals in Chrome Yellow).<\/li>\n<\/ol>\n

        ⚠️ Common Compatibility Issue:<\/strong>\nMixing lake pigments or azo pigments with Chrome Yellow can cause the red color to diminish over time due to oxidation reactions.<\/p>\n

        \n

        4. Acid and Alkali Resistance<\/h3>\n

        The fading of colored plastic products is also closely related to the chemical resistance of the colorant (specifically acid\/alkali resistance and oxidation-reduction resistance).<\/p>\n

          \n
        • Molybdate Red:<\/strong> Resistant to dilute acids but sensitive to alkalis.<\/li>\n
        • Cadmium Yellow:<\/strong> Not acid-resistant.<\/li>\n
        • Phenolic Resins:<\/strong> These can exert a strong reducing effect on certain colorants, severely impacting heat resistance and weatherability, leading to fading.<\/li>\n<\/ul>\n
          \n

          📊 Summary: Factors Affecting Plastic Colorfastness<\/h3>\n\n\n\n\n\n\n\n\n
          Factor<\/th>\nPrimary Cause of Fading<\/th>\nKey Consideration<\/th>\n<\/tr>\n<\/thead>\n
          Lightfastness<\/strong><\/td>\nUV radiation breaking down molecular bonds.<\/td>\nUse UV stabilizers; choose Level 7+ for outdoors.<\/td>\n<\/tr>\n
          \u8010\u71b1\u6027<\/strong><\/td>\nThermal decomposition during processing.<\/td>\nCheck max processing temp vs. pigment stability.<\/td>\n<\/tr>\n
          Oxidation<\/strong><\/td>\nReaction with oxygen or oxidizing agents.<\/td>\nAvoid incompatible pigment mixes (e.g., Azo + Chrome).<\/td>\n<\/tr>\n
          \u8010\u85ac\u54c1\u6027<\/strong><\/td>\nReaction to acids, alkalis, or resin additives.<\/td>\nMatch pigment chemistry to the polymer matrix.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
          \n

          ✅ Conclusion<\/h3>\n

          To prevent fading in plastic coloring products, a comprehensive evaluation is required. You must assess the pigments, dyes, surfactants, dispersants, carrier resins, and anti-aging additives<\/strong> based on the specific processing conditions and end-use requirements of the plastic product.<\/h2>","protected":false},"excerpt":{"rendered":"

          Why Do Plastic Colored Products Fade? A Deep Dive into Color Stability Have you ever wondered why some plastic products […]<\/p>\n","protected":false},"author":2,"featured_media":12136,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_robots_primary_cat":"none","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[21],"tags":[172,171],"class_list":["post-12131","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-color-masterbatch","tag-plastic-fading"],"acf":[],"_links":{"self":[{"href":"https:\/\/ideal-pro.com\/ja\/wp-json\/wp\/v2\/posts\/12131","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ideal-pro.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ideal-pro.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ideal-pro.com\/ja\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ideal-pro.com\/ja\/wp-json\/wp\/v2\/comments?post=12131"}],"version-history":[{"count":3,"href":"https:\/\/ideal-pro.com\/ja\/wp-json\/wp\/v2\/posts\/12131\/revisions"}],"predecessor-version":[{"id":12137,"href":"https:\/\/ideal-pro.com\/ja\/wp-json\/wp\/v2\/posts\/12131\/revisions\/12137"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ideal-pro.com\/ja\/wp-json\/wp\/v2\/media\/12136"}],"wp:attachment":[{"href":"https:\/\/ideal-pro.com\/ja\/wp-json\/wp\/v2\/media?parent=12131"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ideal-pro.com\/ja\/wp-json\/wp\/v2\/categories?post=12131"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ideal-pro.com\/ja\/wp-json\/wp\/v2\/tags?post=12131"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}