{"id":1959,"date":"2026-06-09T11:52:36","date_gmt":"2026-06-09T10:52:36","guid":{"rendered":"https:\/\/saeschemicals.test.builders\/2026\/06\/09\/why-reliable-spf-testing-is-a-real-challenge\/"},"modified":"2026-07-13T12:00:12","modified_gmt":"2026-07-13T11:00:12","slug":"why-reliable-spf-testing-is-a-real-challenge","status":"publish","type":"post","link":"https:\/\/saeschemicals.test.builders\/it\/2026\/06\/09\/why-reliable-spf-testing-is-a-real-challenge\/","title":{"rendered":"Why reliable SPF testing is a real challenge"},"content":{"rendered":"\n<p>For formulators and R&amp;D teams, developing high-performance&nbsp;<strong>sunscreen formulations<\/strong>&nbsp;is about more than selecting active ingredients \u2014 it\u2019s about proving&nbsp;<strong>effective, measurable protection<\/strong>&nbsp;under the strictest&nbsp;<strong>global standards<\/strong>, while balancing sensory profile, filter load, and sustainability.<br>Traditionally, the most recognized methods for measuring SPF and UVA-PF are&nbsp;<strong>in vivo&nbsp;<\/strong>protocols, such as ISO 24444:2019 (SPF) and ISO 24443:2021 (UVA-PF).<\/p>\n\n\n\n<p>These methods rely on human volunteers \u2014 and in the case of SPF, involve controlled UV exposure to induce erythema (sunburn) as a means to assess protection.<br>While widely used, these protocols raise concerns about ethics, cost, and reproducibility \u2014 especially as the demand for cleaner, more&nbsp;<strong>sustainable SPF<\/strong>&nbsp;innovation grows across the industry.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">How the new ISO standards change the game<\/h2>\n\n\n\n<p>In recent years, two new standards were approved: ISO 23698 and ISO 23675.<br>Both aim to offer an alternative to&nbsp;<strong>in vivo<\/strong>&nbsp;testing \u2014 but they work in different ways:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ISO 23698 still involves human volunteers but uses a more ethical approach: instead of inducing erythema, it measures the&nbsp;<strong>UV absorption method<\/strong>&nbsp;directly on treated skin.<\/li>\n\n\n\n<li><strong>ISO 23675<\/strong>, the standard SAES Chemicals has chosen to adopt, is fully&nbsp;<strong>in vitro SPF validation<\/strong>&nbsp;\u2014 it works entirely on PMMA plates, with no need for volunteers at any stage.<\/li>\n<\/ul>\n\n\n\n<p>While technically more complex, ISO 23675 is the most&nbsp;<strong>ethical SPF testing<\/strong>&nbsp;method, offering high repeatability for validating&nbsp;<strong>next-generation suncare innovations<\/strong>. It improves consistency and reproducibility, supporting the development of&nbsp;<strong>hybrid SPF<\/strong>&nbsp;solutions that meet global demands.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">What makes ZeoSAES\u00ae UV Booster different<\/h2>\n\n\n\n<p><strong>ZeoSAES\u00ae UV Booster<\/strong>&nbsp;is an inorganic&nbsp;<strong>SPF booster<\/strong>&nbsp;based on engineered zeolites.<br>It delivers measurable improvements in UV protection&nbsp;<strong>(+75% SPF, +38% UVA-PF at just 3% dosage)<\/strong>&nbsp;and is tested following the ISO 23675&nbsp;<strong>in vitro<\/strong>&nbsp;protocol \u2014 alongside classic&nbsp;<strong>in vivo<\/strong>&nbsp;standards.<\/p>\n\n\n\n<p>This means:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Formulators get reliable, measurable SPF claims, validated across multiple recognized methods.<\/li>\n\n\n\n<li>Brands can highlight&nbsp;<strong>ethical SPF testing<\/strong>, aligning with modern&nbsp;<strong>suncare innovation<\/strong>&nbsp;and&nbsp;<strong>clean beauty<\/strong>&nbsp;standards.<\/li>\n\n\n\n<li>Your final\u00a0<strong>non-nano sunscreen<\/strong>\u00a0formula is more market-ready worldwide, featuring non-nano particles (&lt;10 \u03bcm) and full global compliance (EU, US, Korea, Brazil, China).<\/li>\n<\/ul>\n\n\n\n<div style=\"height:15px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button is-style-fill\"><a class=\"wp-block-button__link wp-element-button\">Discover our ZeoSAES\u00ae UV Booster<\/a><\/div>\n<\/div>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Why this matters for your formulation<\/h2>\n\n\n\n<p>With ZeoSAES\u00ae UV Booster, it\u2019s not just about the data \u2014 it\u2019s about flexibility and collaboration.<br>Our lab team can run dedicated tests on your own base, helping you optimize SPF performance while reducing overall filter load, greasiness, and instability.<br>Whether you\u2019re developing a daily sunscreen,&nbsp;<strong>hybrid SPF<\/strong>&nbsp;primer, baby care or sensitive skin SPF, the booster supports light textures and a satin-like, dry finish that both formulators and consumers expect.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Global compliance and clean label<\/h2>\n\n\n\n<p>High SPF, lower filters, better texture \u2014 plus full regulatory support for global markets, including China.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ISO 24444 (<strong>in vivo SPF<\/strong>)<\/li>\n\n\n\n<li>ISO 24443 (<strong>in vivo UVA-PF<\/strong>)<\/li>\n\n\n\n<li>ISO 23675 (<strong>in vitro SPF validation<\/strong>, PMMA-based, no human volunteers)<\/li>\n<\/ul>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Ready to test your next-generation sun protection?<\/h2>\n\n\n\n<p>Request technical documentation, test reports or discuss your next project with our team.<br>Write to us: <a href=\"mailto:chemicals@saes-group.com\">chemicals@saes-group.com<\/a><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>For formulators and R&amp;D teams, developing high-performance&nbsp;sunscreen formulations&nbsp;is about more than selecting active ingredients \u2014 it\u2019s about proving&nbsp;effective, measurable protection&nbsp;under the strictest&nbsp;global standards, while balancing sensory profile, filter load, and sustainability.Traditionally, the most recognized methods for measuring SPF and UVA-PF are&nbsp;in vivo&nbsp;protocols, such as ISO 24444:2019 (SPF) and ISO 24443:2021 (UVA-PF). These methods rely on [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1191,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[165],"tags":[],"class_list":["post-1959","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-journal"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why reliable SPF testing is a real challenge - Saes Chemicals<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why reliable SPF testing is a real challenge - Saes Chemicals\" \/>\n<meta property=\"og:description\" content=\"For formulators and R&amp;D teams, developing high-performance&nbsp;sunscreen formulations&nbsp;is about more than selecting active ingredients \u2014 it\u2019s about proving&nbsp;effective, measurable protection&nbsp;under the strictest&nbsp;global standards, while balancing sensory profile, filter load, and sustainability.Traditionally, the most recognized methods for measuring SPF and UVA-PF are&nbsp;in vivo&nbsp;protocols, such as ISO 24444:2019 (SPF) and ISO 24443:2021 (UVA-PF). 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