{"id":20347,"date":"2025-11-05T06:00:55","date_gmt":"2025-11-05T12:00:55","guid":{"rendered":"https:\/\/ulprospector.ul.com\/?p=20347"},"modified":"2025-10-22T13:42:18","modified_gmt":"2025-10-22T19:42:18","slug":"pcc-beyond-the-bottle-formulating-next-generation-waterless-shampoo-bars","status":"publish","type":"post","link":"https:\/\/ulprospector.ul.com\/20347\/pcc-beyond-the-bottle-formulating-next-generation-waterless-shampoo-bars\/","title":{"rendered":"Beyond the Bottle: Formulating Next-Generation Waterless Shampoo Bars"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-14061\" src=\"http:\/\/ulprospector.ul.com\/wp-content\/uploads\/2023\/04\/GettyImages-1182872102-selecting-cosmetics-400x600-1-300x200.jpg\" alt=\"Selecting cosmetics\" width=\"300\" height=\"200\" srcset=\"https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2023\/04\/GettyImages-1182872102-selecting-cosmetics-400x600-1-300x200.jpg 300w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2023\/04\/GettyImages-1182872102-selecting-cosmetics-400x600-1.jpg 600w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/>The global shift toward sustainable and concentrated beauty is transforming traditional formulation science. Among the most dynamic areas of innovation:\u00a0<a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?k=waterless+shampoo%20bar&amp;st=31\" target=\"_blank\" rel=\"noopener\">waterless and low-water shampoo bars<\/a>. These solid formats eliminate the need for plastic bottles, reduce shipping weight, and appeal to eco-conscious consumers \u2014 but they also challenge formulators to deliver the same sensorial and functional performance as liquid shampoos, in a completely different medium.<\/p>\n<p><strong>Why Go Waterless?<\/strong><\/p>\n<p>Traditional liquid shampoos contain up to\u00a080\u201390% water, which acts as a solvent and carrier but also adds bulk, increases packaging needs, and requires preservatives. Solid shampoo bars, by contrast, remove most or all water, concentrating actives and allowing for\u00a0smaller formats, reduced carbon footprint, and simplified preservative systems.<\/p>\n<p>For formulators, the opportunity is clear: high-performance, low-impact cleansers that meet sustainability and consumer expectations for luxury, lather, and mildness.<\/p>\n<p><strong>The Foundation: Choosing the Right Surfactant System<\/strong><\/p>\n<p>At the core of every solid shampoo is its\u00a0<a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?k=%22surfactant+blend%22&amp;st=31&amp;utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">surfactant blend\u00a0<\/a>\u2014 the balance that determines cleansing strength, foam, and skin compatibility.<\/p>\n<ul>\n<li><strong>Solid Surfactants as Structural Bases:<\/strong><br \/>\n<a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?incival=Sodium+Cocoyl+Isethionate&amp;sug=1&amp;st=31&amp;utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">Sodium cocoyl isethionate<\/a> (SCI), <a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?incival=Sodium+Lauryl+Sulfoacetate&amp;sug=1&amp;st=31&amp;utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">sodium lauryl sulfoacetate<\/a> (SLSA), and <a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?incival=Disodium+Lauryl+Sulfosuccinate&amp;sug=1&amp;st=31&amp;utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">disodium lauryl sulfosuccinate<\/a> are favored for their mildness and solid-state compatibility. These powders and granules provide structure while maintaining good foam even at low water levels.<\/li>\n<li><strong>Balancing Performance and Mildness:<\/strong><br \/>\nCombining anionic surfactants (for cleansing) with amphoteric or nonionic surfactants \u2014 such as <a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?incival=Cocamidopropyl+Betaine&amp;sug=1&amp;st=31&amp;utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">cocamidopropyl betaine<\/a> or <a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?k=%22alkyl+polyglucoside%22&amp;st=31&amp;utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">alkyl polyglucosides<\/a> \u2014 helps achieve scalp comfort, reduces irritation, and enhances bar pliability.<\/li>\n<li><strong>Binding and Conditioning Agents:<\/strong><br \/>\nCationic polymers, hydrolyzed proteins, or natural conditioning agents like <a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?incival=Behentrimonium+Chloride&amp;sug=1&amp;st=31&amp;utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">behentrimonium chloride<\/a> and <a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?k=guar+hydroxypropyltrimonium+chloride&amp;st=31&amp;utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">guar hydroxypropyltrimonium chloride<\/a> improve combability and sensorial feel without requiring a liquid base.<\/li>\n<\/ul>\n<p><strong>Waterless Doesn\u2019t Mean Dry: The Role of Humectants and Lipids<\/strong><\/p>\n<p>While the format is solid,\u00a0maintaining moisture balance\u00a0in the hair and scalp remains essential. Formulators often incorporate <a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/Product\/search?k=Humectants&amp;sug=1&amp;st=31&amp;utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">humectants<\/a> like glycerin, sorbitol, or propanediol to retain hydration upon lathering.<\/p>\n<p>Meanwhile,\u00a0<a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/Product\/search?k=Emollients&amp;sug=1&amp;st=31&amp;utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">emollients<\/a> and <a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?k=%22lipids%22&amp;st=31&amp;utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">lipids<\/a>\u00a0\u2014 such as coconut oil, shea butter, esters, or silicone alternatives \u2014 enhance slip and provide barrier repair. These ingredients also help bind the formula, supporting both stability and performance.<\/p>\n<hr \/>\n<h3>Easily search Compliance Highlights, Natural and Organic claims and Certifications with Prospector Premium, learn more <a href=\"https:\/\/www.ulprospector.com\/pcc-basic?utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">here<\/a>!<\/h3>\n<hr \/>\n<p><strong>Structuring and Stability<\/strong><\/p>\n<p>Because waterless systems rely on\u00a0mechanical integrity\u00a0rather than viscosity, bar hardness and dissolution rate become key performance attributes. Solid binders (e.g., <a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?incival=Stearic+Acid&amp;sug=1&amp;st=31&amp;utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">stearic acid<\/a>, <a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?incival=Cetyl+Alcohol&amp;sug=1&amp;st=31&amp;utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">cetyl alcohol<\/a>, or hydrogenated plant waxes) help control structure and melting point.<\/p>\n<p>Maintaining uniform particle size and ensuring even surfactant distribution are critical for consistent foaming and wear rate. Processing methods such as\u00a0hot-melt extrusion or pressed-powder compaction\u00a0allow precise control of texture and density.<\/p>\n<p><strong>Rethinking Preservation and Shelf Life<\/strong><\/p>\n<p>With minimal water content, microbial growth is inherently lower \u2014 but\u00a0<a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?k=%22hygroscopic%22&amp;st=31&amp;utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">hygroscopic<\/a> ingredients\u00a0or consumer exposure can still introduce moisture. Formulators typically use\u00a0broad-spectrum, solid-compatible preservatives\u00a0such as <a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?incival=Sodium+Benzoate&amp;sug=1&amp;st=31&amp;utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">sodium benzoate<\/a>, <a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?incival=Potassium+Sorbate&amp;sug=1&amp;st=31&amp;utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">potassium sorbate<\/a>, or natural multi-functionals like <a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?incival=Caprylyl+Glycol&amp;sug=1&amp;st=31&amp;utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">caprylyl glycol<\/a>.<\/p>\n<p>Additionally, pH optimization (typically between 5 and 6) supports both preservation and scalp health.<\/p>\n<p><strong>Innovation Directions<\/strong><\/p>\n<p>Ingredient suppliers are responding rapidly with new\u00a0waterless-compatible surfactants, plasticizers, and conditioning actives. Examples include:<\/p>\n<ul>\n<li>Bio-based mild surfactants\u00a0derived from amino acids or sugars.<\/li>\n<li>Powdered natural extracts and oils\u00a0for targeted benefits.<\/li>\n<li>Anhydrous encapsulation systems\u00a0to deliver fragrance and vitamins.<\/li>\n<\/ul>\n<p>Emerging technology also includes\u00a0hybrid solid\/liquid systems\u00a0\u2014 soft bars, paste formats, or \u201cconcentrate drops\u201d \u2014 offering easier processing and consumer customization.<\/p>\n<p><strong>From Lab to Market<\/strong><\/p>\n<p>For formulators and manufacturers, moving from traditional liquids to <a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare\/search?k=waterless+shampoo%20bar&amp;st=31\" target=\"_blank\" rel=\"noopener\">waterless bars<\/a> involves rethinking everything from raw material handling to pilot-scale testing. Yet the rewards are substantial:\u00a0less water, less waste, and more innovation.<\/p>\n<p>As the <a href=\"https:\/\/www.ulprospector.com\/en\/na\/PersonalCare?utm_source=KnowledgeCenter&amp;utm_medium=article&amp;utm_campaign=waterless_shampoo_bar&amp;utm_term=2025PCC&amp;utm_content=SEO\" target=\"_blank\" rel=\"noopener\">personal care industry<\/a> redefines what \u201cclean\u201d means, solid formats demonstrate that sustainability can coexist with high performance \u2014 one bar at a time.<\/p>\n<p><strong>References &amp; Resources<\/strong><\/p>\n<ol>\n<li>UL Solutions Prospector.\u00a0<em>Formulation Examples: Solid Shampoo Bars and Concentrated Cleansers.<\/em><\/li>\n<li>Cosmetics &amp; Toiletries.\u00a0<em>Formulating Waterless Cleansers and Conditioning Bars (2024).<\/em><\/li>\n<li>Mintel GNPD.\u00a0<em>Trends in Solid and Waterless Haircare Formats (2023\u20132025).<\/em><\/li>\n<li>American Society of Cosmetic Chemists (SCC).\u00a0<em>Advances in Anhydrous Formulation Technology.<\/em><\/li>\n<li>UL Solutions.\u00a0<em>Ingredient Search for Mild, Solid-Compatible Surfactants.<\/em><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>The global shift toward sustainable and concentrated beauty is transforming traditional formulation science. Among the most dynamic areas of innovation:\u00a0waterless and low-water shampoo bars. These solid formats eliminate the need for plastic bottles, reduce shipping weight, and appeal to eco-conscious &hellip; <a href=\"https:\/\/ulprospector.ul.com\/20347\/pcc-beyond-the-bottle-formulating-next-generation-waterless-shampoo-bars\/\">Continued<\/a><\/p>\n","protected":false},"author":103,"featured_media":14061,"comment_status":"closed","ping_status":"closed","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":[607,5],"tags":[206,379,1017],"ppma_author":[1245],"class_list":{"0":"post-20347","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-articles","8":"category-personal-care-cosmetics-cleaners","9":"tag-sustainability","10":"tag-personal-care","11":"tag-waterless","12":"entry"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Beyond the Bottle: Formulating Next-Generation Waterless Shampoo Bars<\/title>\n<meta name=\"description\" content=\"Explore how formulators are creating waterless and low-water shampoo bars that deliver luxurious foam, mild cleansing, and sustainability. Learn about solid surfactant systems, conditioning agents, and formulation strategies shaping the future of haircare.\" \/>\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\/20347\/pcc-beyond-the-bottle-formulating-next-generation-waterless-shampoo-bars\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Beyond the Bottle: Formulating Next-Generation Waterless Shampoo Bars\" \/>\n<meta property=\"og:description\" content=\"Explore how formulators are creating waterless and low-water shampoo bars that deliver luxurious foam, mild cleansing, and sustainability. Learn about solid surfactant systems, conditioning agents, and formulation strategies shaping the future of haircare.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ulprospector.ul.com\/20347\/pcc-beyond-the-bottle-formulating-next-generation-waterless-shampoo-bars\/\" \/>\n<meta property=\"og:site_name\" content=\"Prospector Knowledge Center\" \/>\n<meta property=\"article:published_time\" content=\"2025-11-05T12:00:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2023\/04\/GettyImages-1182872102-selecting-cosmetics-400x600-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"600\" \/>\n\t<meta property=\"og:image:height\" content=\"400\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Staff\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Staff\" \/>\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\\\/20347\\\/pcc-beyond-the-bottle-formulating-next-generation-waterless-shampoo-bars\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/ulprospector.ul.com\\\/20347\\\/pcc-beyond-the-bottle-formulating-next-generation-waterless-shampoo-bars\\\/\"},\"author\":{\"name\":\"Staff\",\"@id\":\"https:\\\/\\\/ulprospector.ul.com\\\/#\\\/schema\\\/person\\\/75adb7eed2f5a6489678ba28ef7cad5a\"},\"headline\":\"Beyond the Bottle: Formulating Next-Generation Waterless Shampoo Bars\",\"datePublished\":\"2025-11-05T12:00:55+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/ulprospector.ul.com\\\/20347\\\/pcc-beyond-the-bottle-formulating-next-generation-waterless-shampoo-bars\\\/\"},\"wordCount\":660,\"image\":{\"@id\":\"https:\\\/\\\/ulprospector.ul.com\\\/20347\\\/pcc-beyond-the-bottle-formulating-next-generation-waterless-shampoo-bars\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/ulprospector.ul.com\\\/wp-content\\\/uploads\\\/2023\\\/04\\\/GettyImages-1182872102-selecting-cosmetics-400x600-1.jpg\",\"keywords\":[\"sustainability\",\"personal care\",\"waterless\"],\"articleSection\":[\"Articles\",\"Personal Care &amp; Cosmetics\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/ulprospector.ul.com\\\/20347\\\/pcc-beyond-the-bottle-formulating-next-generation-waterless-shampoo-bars\\\/\",\"url\":\"https:\\\/\\\/ulprospector.ul.com\\\/20347\\\/pcc-beyond-the-bottle-formulating-next-generation-waterless-shampoo-bars\\\/\",\"name\":\"Beyond the Bottle: Formulating Next-Generation Waterless Shampoo Bars\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/ulprospector.ul.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/ulprospector.ul.com\\\/20347\\\/pcc-beyond-the-bottle-formulating-next-generation-waterless-shampoo-bars\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/ulprospector.ul.com\\\/20347\\\/pcc-beyond-the-bottle-formulating-next-generation-waterless-shampoo-bars\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/ulprospector.ul.com\\\/wp-content\\\/uploads\\\/2023\\\/04\\\/GettyImages-1182872102-selecting-cosmetics-400x600-1.jpg\",\"datePublished\":\"2025-11-05T12:00:55+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/ulprospector.ul.com\\\/#\\\/schema\\\/person\\\/75adb7eed2f5a6489678ba28ef7cad5a\"},\"description\":\"Explore how formulators are creating waterless and low-water shampoo bars that deliver luxurious foam, mild cleansing, and sustainability. 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