{"id":1771,"date":"2015-01-02T08:00:49","date_gmt":"2015-01-02T13:00:49","guid":{"rendered":"https:\/\/www.ulprospector.com\/knowledge\/?p=1771"},"modified":"2015-05-12T09:32:53","modified_gmt":"2015-05-12T14:32:53","slug":"pcc-cosmetic-formulators-guide-stability-testing","status":"publish","type":"post","link":"https:\/\/ulprospector.ul.com\/1771\/pcc-cosmetic-formulators-guide-stability-testing\/","title":{"rendered":"Cosmetic Formulators\u2019 Guide to Stability Testing"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-2474\" src=\"https:\/\/ulprospector.ul.com\/media\/2015\/05\/Cosmetics-300x199.jpg\" alt=\"Cosmetics\" width=\"300\" height=\"199\" srcset=\"https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2015\/05\/Cosmetics-300x199.jpg 300w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2015\/05\/Cosmetics.jpg 600w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/>One of the most common types of testing cosmetic formulators perform is <a href=\"https:\/\/ulprospector.ul.com\/2470\/pcc-understanding-cosmetic-stability-testing-perry-romanowski\/\" target=\"_blank\">stability testing<\/a>. Unfortunately, this is not a topic covered in college, so most people who start in the cosmetic industry know very little about the subject.<\/p>\n<p>Having a thorough knowledge of what stability testing is, when you need to conduct tests and how you do them is critical for anyone who wants to be a successful formulator. We will cover some key aspects of cosmetic stability testing in this article.<\/p>\n<p><strong>What is stability testing?<\/strong><\/p>\n<p>When putting together a cosmetic product, your primary goal as a formulator is to create a product that looks, feels, smells and performs the same way for the consumer as it did on the first day that you made it.\u00a0 Products that fail these standards are low-quality and may even be considered unsafe.\u00a0 The way you ensure a high-quality product is to conduct a stability test, which subjects your formula to different environmental conditions over a specific amount of time.\u00a0 You track any changes that might occur and decide whether the changes are significant.<\/p>\n<p><strong>When do you stability test formulas?<\/strong><\/p>\n<p>Since you\u2019ll be making hundreds or thousands of prototypes during your career, it won\u2019t be practical to run a stability test on all of them. You\u2019ll also find that projects change so rapidly at your company that you won\u2019t have time to properly test many of your formulas. But there are times when you need to do stability testing.\u00a0 These include the following:<\/p>\n<ul>\n<li>New prototypes<\/li>\n<li>New raw material qualifications<\/li>\n<li>New manufacturing procedures<\/li>\n<li>New packaging<\/li>\n<\/ul>\n<p><strong>Philosophy of stability testing<\/strong><\/p>\n<p>Stability testing is simply an experiment in which you create a batch of your formula and put samples of it at different environmental conditions for a set period of time. These conditions vary in temperature and light levels and are meant to simulate what will happen to the product during its life cycle.<\/p>\n<p>At various time intervals you evaluate your samples for various physical, chemical and performance characteristics and determine whether any changes are significant based on your company standards.\u00a0 If nothing changes significantly (which is your hope) then your formula is said to have \u201cpassed\u201d stability testing. This means you can be confident that when the formula is shipped to stores and ultimately customers, it will still be as good as when it was first manufactured.\u00a0 It&#8217;s common in the cosmetic industry to strive for a formula that is stable at room temperature for at least one year.<\/p>\n<p>One underlying assumption in stability testing is that increasing storage temperature speeds up aging reactions that might occur. An industry rule-of-thumb is that a sample stored at 45\u00b0C for 8 weeks is equivalent to one that is stored at room temperature for one year.\u00a0 Stability testing isn&#8217;t exact science, but it\u2019s good enough for the purposes of cosmetic products.<\/p>\n<p><strong>How do you stability test a cosmetic?<\/strong><\/p>\n<p>In the US, there are no set rules on how you must conduct a stability test for cosmetic products. For cosmetic OTC products like <a href=\"http:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/Functionalities\/3699\/Sunscreen-Agents\/search?k=sunscreen&amp;st=31\" target=\"_blank\">sunscreens<\/a> (<a href=\"http:\/\/www.ulprospector.com\/en\/eu\/PersonalCare\/Product\/search?k=Sunscreen+Agents&amp;sug=1&amp;st=31\" target=\"_blank\">EU<\/a>), AP\/DO, or <a href=\"http:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?k=dandruff+shampoos&amp;st=31\" target=\"_blank\">dandruff shampoos<\/a> (<a href=\"http:\/\/www.ulprospector.com\/en\/eu\/PersonalCare\/search?k=dandruff+shampoos&amp;st=31\" target=\"_blank\">EU<\/a>) the FDA has specific stability test requirements that you have to follow. See the FDA website for more information.<\/p>\n<p>For cosmetic products, here is a basic format to follow when conducting a stability test:<\/p>\n<ul>\n<li>Make your batches. Sometimes a test and a control batch need to be made.<\/li>\n<li>Fill samples. Ideally, this will be in the finished packaging. Using glass jars is advisable too.<\/li>\n<li>Take initial readings. This way you\u2019ll know where the formula started.<\/li>\n<li>Put samples at various conditions. Try temperature ranges from 4\u00b0C \u2013 50\u00b0C. Also, vary lighting conditions.<\/li>\n<li>Evaluate samples at time intervals. Typically, 2, 4, 8 and 12 week intervals are used.\u00a0 Don&#8217;t forget to do a microbial challenge test.<\/li>\n<li>Determine stability.\u00a0 If the formula has changed little in 8 weeks at elevated temperatures, it will likely last for a year at room temperature.<\/li>\n<\/ul>\n<p>Stability testing is a crucial part of creating safe and effective cosmetic products. Whenever you launch a new product or make a significant change to a current one, be sure to do a proper stability test.<\/p>\n<p>Enjoy this article? Perry Romanowski will be presenting a free webinar on stability testing via Prospector on June 9th at 9am CDT! <a href=\"https:\/\/ulprospector.ul.com\/2470\/pcc-understanding-cosmetic-stability-testing-perry-romanowski\/\" target=\"_blank\">Learn more&#8230;<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>One of the most common types of testing cosmetic formulators perform is stability testing. Unfortunately, this is not a topic covered in college, so most people who start in the cosmetic industry know very little about the subject. Having a &hellip; <a href=\"https:\/\/ulprospector.ul.com\/1771\/pcc-cosmetic-formulators-guide-stability-testing\/\">Continued<\/a><\/p>\n","protected":false},"author":24,"featured_media":1776,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"episode_type":"","audio_file":"","podmotor_file_id":"","podmotor_episode_id":"","cover_image":"","cover_image_id":"","duration":"","filesize":"","filesize_raw":"","date_recorded":"","explicit":"","block":"","itunes_episode_number":"","itunes_title":"","itunes_season_number":"","itunes_episode_type":"","footnotes":""},"categories":[5],"tags":[],"ppma_author":[1258],"class_list":{"0":"post-1771","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-personal-care-cosmetics-cleaners","8":"entry"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Formulator&#039;s Guide to Stability Testing by Perry Romanowski<\/title>\n<meta name=\"description\" content=\"Guest author Perry Romanowski explains the ins and outs of stability testing for cosmetic formulators in this exclusive article.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ulprospector.ul.com\/1771\/pcc-cosmetic-formulators-guide-stability-testing\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Formulator&#039;s Guide to Stability Testing by Perry Romanowski\" \/>\n<meta property=\"og:description\" content=\"Guest author Perry Romanowski explains the ins and outs of stability testing for cosmetic formulators in this exclusive article.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ulprospector.ul.com\/1771\/pcc-cosmetic-formulators-guide-stability-testing\/\" \/>\n<meta property=\"og:site_name\" content=\"Prospector Knowledge Center\" \/>\n<meta property=\"article:published_time\" content=\"2015-01-02T13:00:49+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2015-05-12T14:32:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2015\/01\/StabilityTestingFeatured.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"495\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Perry Romanowski\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Perry Romanowski\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/ulprospector.ul.com\\\/1771\\\/pcc-cosmetic-formulators-guide-stability-testing\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/ulprospector.ul.com\\\/1771\\\/pcc-cosmetic-formulators-guide-stability-testing\\\/\"},\"author\":{\"name\":\"Perry Romanowski\",\"@id\":\"https:\\\/\\\/ulprospector.ul.com\\\/#\\\/schema\\\/person\\\/82bb1138f34c1275f0c5dda74e5037fc\"},\"headline\":\"Cosmetic Formulators\u2019 Guide to Stability Testing\",\"datePublished\":\"2015-01-02T13:00:49+00:00\",\"dateModified\":\"2015-05-12T14:32:53+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/ulprospector.ul.com\\\/1771\\\/pcc-cosmetic-formulators-guide-stability-testing\\\/\"},\"wordCount\":717,\"commentCount\":7,\"image\":{\"@id\":\"https:\\\/\\\/ulprospector.ul.com\\\/1771\\\/pcc-cosmetic-formulators-guide-stability-testing\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/ulprospector.ul.com\\\/wp-content\\\/uploads\\\/2015\\\/01\\\/StabilityTestingFeatured.jpg\",\"articleSection\":[\"Personal Care &amp; 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His primary focus has been on hair and\u00a0hair-related products. He is currently vice president of Brains\u00a0Publishing, which specialized in science education. In 2014,\u00a0Romanowski founded the Practical Cosmetic Formulating online training\u00a0program to provide cosmetic chemists continuing education across a broad\u00a0range of formula categories. Previously, Romanowski worked for Alberto Culver\u00a0serving as a senior project leader for hair care innovation. He is currently\u00a0the Area II National Director for the Society of Cosmetic Chemists (SCC). \u00a0Additionally, he has made numerous media appearances including spots on popular TV shows including\u00a0the Dr. Oz show and the Rachel Ray show. Romanowski received his B.S. in Chemistry from DePaul University. He has written and edited numerous articles and\u00a0books, taught the SCC\u2019s Beginning Cosmetic Chemistry continuing\u00a0education class, and developed websites including ChemistsCorner.com and TheBeautyBrains.com.\u00a0 His latest book \"It's OK to Have Lead in Your Lipstick\" answers common questions about cosmetic products.\u00a0 In addition, he\u00a0provides consulting services for cosmetic formulating, testing and\u00a0Internet solutions; he can be reached through his\u00a0website,\u00a0www.ChemistsCorner.com.","sameAs":["http:\/\/ulprospector.com"],"url":"https:\/\/ulprospector.ul.com\/author\/perry-romanowski\/"}]}},"authors":[{"term_id":1258,"user_id":24,"is_guest":0,"slug":"perry-romanowski","display_name":"Perry Romanowski","avatar_url":"https:\/\/ulprospector.ul.com\/media\/2017\/10\/Perry-Romanowski_avatar_1508793389-96x96.jpg","0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""}],"_links":{"self":[{"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/posts\/1771","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/users\/24"}],"replies":[{"embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/comments?post=1771"}],"version-history":[{"count":0,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/posts\/1771\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/media\/1776"}],"wp:attachment":[{"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/media?parent=1771"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/categories?post=1771"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/tags?post=1771"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/ppma_author?post=1771"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}