{"id":17855,"date":"2026-04-19T00:08:13","date_gmt":"2026-04-18T18:38:13","guid":{"rendered":"https:\/\/aluminiummagazine.com\/mag\/?p=17855"},"modified":"2026-04-19T00:08:14","modified_gmt":"2026-04-18T18:38:14","slug":"aluminium-chlorohydrate-antiperspirant-uses","status":"publish","type":"post","link":"https:\/\/aluminiummagazine.com\/mag\/aluminium\/compounds\/aluminium-chlorohydrate-antiperspirant-uses.html","title":{"rendered":"Aluminum Chlorohydrate (Al\u2082(OH)\u2085Cl): The Complete Guide"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Aluminum chlorohydrate, often abbreviated as ACH, is a water-soluble, polymeric aluminum species that sits comfortably between the violent reactivity of anhydrous aluminum chloride and the benign inertness of aluminum hydroxide. It appears as a white to off-white powder or a clear to pale yellow solution. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike its anhydrous halide cousins, ACH is deliberately designed to be <strong>mild, safe, and highly effective<\/strong> in two vastly different domains: underarm antiperspirants and municipal drinking water purification.<\/p>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">1. <strong>Basic Identification<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Chemical Formula:<\/strong> Typically written as Al\u2082(OH)\u2085Cl \u00b7 2H\u2082O (the most common commercial form). The general formula is often represented as [Al\u2082(OH)\u2099Cl\u2086\u208b\u2099]\u2098, where n \u2248 5.<\/p><div class=\"pai-ad\" style=\"min-height:250px;visibility:hidden;\"><span style=\"display: block; text-align: center; font-size: 10px; margin: 0 0 10px 0; color: #999999;\">Ads<\/span>\r\n<!-- Display-300x250-1 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:300px;height:250px\"\r\n     data-ad-client=\"ca-pub-3838168351244230\"\r\n     data-ad-slot=\"9933646018\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Alternative Names:<\/strong> Aluminum chlorohydrate, ACH, aluminum chlorhydroxide, basic aluminum chloride, polyaluminum chloride (PAC \u2013 related but not identical).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Molecular Weight:<\/strong> Approximately 174.45 g\/mol (for the Al\u2082(OH)\u2085Cl unit, excluding waters of hydration).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>CAS Number:<\/strong> 1327-41-9 (basic aluminum chloride, generic); 12042-91-0 (specific ACH).<\/p><div class=\"pai-ad\" style=\"min-height:250px;visibility:hidden;\"><span style=\"display: block; text-align: center; font-size: 10px; margin: 0 0 10px 0; color: #999999;\">Ads<\/span>\r\n<!-- Display-300x250-1 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:300px;height:250px\"\r\n     data-ad-client=\"ca-pub-3838168351244230\"\r\n     data-ad-slot=\"9933646018\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Appearance:<\/strong> White to pale yellow free-flowing powder or a clear, slightly viscous solution (often 50% w\/w aqueous solution).<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">2. <strong>Physical Properties<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike anhydrous AlCl\u2083, ACH is stable in water and does not fume or hydrolyze violently. Its polymeric structure gives it a mild positive charge, which is key to its applications.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2.1 Key Data Table<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Property<\/th><th class=\"has-text-align-center\" data-align=\"center\">Aluminum Chlorohydrate (Solid)<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Melting Point<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Decomposes above 100\u202f\u00b0C without melting, losing water and HCl.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Bulk Density<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">~0.8\u20131.0 g\/cm\u00b3 (powder)<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Solution pH (50% w\/w)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">3.5 \u2013 4.5 (mildly acidic)<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Solubility in Water<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Extremely soluble (&gt;70% w\/w at 20\u202f\u00b0C)<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Stability<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Stable in sealed containers. Solutions may slowly hydrolyze if heavily diluted.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">2.2 Physical Description<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The solid form resembles fine table salt or baking soda \u2013 white, free\u2011flowing, and odorless. When dissolved in water, it forms a clear to faintly opalescent liquid with a mild astringent taste. Unlike anhydrous aluminum chloride, it does <strong>not<\/strong> fume in humid air, making it safe for consumer product formulation.<\/p><div class=\"pai-ad\" style=\"min-height:250px;visibility:hidden;\"><span style=\"display: block; text-align: center; font-size: 10px; margin: 0 0 10px 0; color: #999999;\">Ads<\/span>\r\n<!-- Display-300x250-1 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:300px;height:250px\"\r\n     data-ad-client=\"ca-pub-3838168351244230\"\r\n     data-ad-slot=\"9933646018\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">3. <strong>Chemical Behavior and Reactions<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Aluminum chlorohydrate is a <strong>polymeric coordination complex<\/strong> where aluminum atoms are bridged by hydroxide groups. Its chemistry revolves around its positive charge and its ability to neutralize negatively charged particles.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3.1 Interaction with Skin (Antiperspirant Mechanism)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When applied to the skin, the acidic ACH solution diffuses into sweat ducts. There, it undergoes a pH increase (from sweat), causing it to hydrolyze and form an insoluble aluminum hydroxide gel plug.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Observation:<\/strong> The gel physically blocks the eccrine sweat gland ducts, reducing the flow of sweat to the skin surface. The effect is temporary and reversible as skin cells regenerate.<\/p><div class=\"pai-ad\" style=\"min-height:250px;visibility:hidden;\"><span style=\"display: block; text-align: center; font-size: 10px; margin: 0 0 10px 0; color: #999999;\">Ads<\/span>\r\n<!-- Display-300x250-1 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:300px;height:250px\"\r\n     data-ad-client=\"ca-pub-3838168351244230\"\r\n     data-ad-slot=\"9933646018\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">3.2 Coagulation in Water Treatment<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In raw water, suspended clay and organic particles carry a negative surface charge, causing them to repel each other. When ACH is added, its highly cationic (positive) polymer chains neutralize these charges, allowing particles to aggregate into larger flocs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Observation:<\/strong> The flocs settle rapidly, removing turbidity, color, and microorganisms. ACH is preferred over traditional alum (aluminum sulfate) because it works efficiently over a wider pH range and leaves less residual aluminum.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3.3 Synthesis (How It Is Made)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">ACH is manufactured by controlled hydrolysis of aluminum chloride solution.<\/p><div class=\"pai-ad\" style=\"min-height:250px;visibility:hidden;\"><span style=\"display: block; text-align: center; font-size: 10px; margin: 0 0 10px 0; color: #999999;\">Ads<\/span>\r\n<!-- Display-300x250-1 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:300px;height:250px\"\r\n     data-ad-client=\"ca-pub-3838168351244230\"\r\n     data-ad-slot=\"9933646018\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Reaction (simplified):<\/strong><\/p>\n\n\n\n<p class=\"has-large-font-size wp-block-paragraph\">AlCl\u2083 + 2.5 H\u2082O \u2192 Al\u2082(OH)\u2085Cl + 5 HCl<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Process:<\/strong> Aluminum metal, hydrochloric acid, and water are reacted under controlled temperature and pressure. The reaction is carefully monitored to achieve the desired basicity (typically 83% neutralized \u2013 meaning 5 out of 6 chloride ions are replaced by hydroxide). The product is then spray\u2011dried to a powder or sold as a concentrated solution.<\/p><div class=\"pai-ad\" style=\"min-height:250px;visibility:hidden;\"><span style=\"display: block; text-align: center; font-size: 10px; margin: 0 0 10px 0; color: #999999;\">Ads<\/span>\r\n<!-- Display-300x250-1 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:300px;height:250px\"\r\n     data-ad-client=\"ca-pub-3838168351244230\"\r\n     data-ad-slot=\"9933646018\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">4. <strong>Industrial and Consumer Applications<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Aluminum chlorohydrate is a high\u2011volume specialty chemical with two dominant uses.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4.1 Antiperspirants (The Most Recognized Use)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">ACH is the <strong>active ingredient<\/strong> in almost all over\u2011the\u2011counter antiperspirants \u2013 sticks, roll\u2011ons, sprays, and creams.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>How it works:<\/strong> As described above, it temporarily blocks sweat ducts.<\/li>\n\n\n\n<li><strong>Why ACH?<\/strong> It is mild enough for daily skin contact, does not cause significant irritation in most users, and is stable in cosmetic formulations.<\/li>\n\n\n\n<li><strong>Regulatory status:<\/strong> Approved by the FDA (US), EU Cosmetics Regulation, and other global bodies at concentrations up to 25% (as ACH).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4.2 Water and Wastewater Treatment (High\u2011Volume Industrial Use)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">ACH is a <strong>coagulant<\/strong> used in drinking water plants, industrial process water, and municipal wastewater treatment.<\/p><div class=\"pai-ad\" style=\"min-height:250px;visibility:hidden;\"><span style=\"display: block; text-align: center; font-size: 10px; margin: 0 0 10px 0; color: #999999;\">Ads<\/span>\r\n<!-- Display-300x250-1 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:300px;height:250px\"\r\n     data-ad-client=\"ca-pub-3838168351244230\"\r\n     data-ad-slot=\"9933646018\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Advantages over alum:<\/strong> Lower pH adjustment needed, produces less sludge, works better in cold water, and removes more natural organic matter.<\/li>\n\n\n\n<li><strong>Result:<\/strong> Cleaner, safer drinking water with reduced disinfection by\u2011products.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4.3 Other Specialized Uses<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Paper sizing:<\/strong> Improves ink holdout and water resistance.<\/li>\n\n\n\n<li><strong>Textile treatment:<\/strong> Enhances dye uptake in some applications.<\/li>\n\n\n\n<li><strong>Catalyst support precursor:<\/strong> After calcination, it forms high\u2011surface\u2011area alumina.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">5. <strong>Safety and Hazard Management<\/strong><\/h2>\n\n\n\n<p class=\"has-large-font-size wp-block-paragraph\">\u26a0\ufe0f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>GHS07<\/strong><br>Irritant<\/p>\n\n\n\n<p class=\"has-large-font-size wp-block-paragraph\">\ud83d\udca7<\/p><div class=\"pai-ad\" style=\"min-height:250px;visibility:hidden;\"><span style=\"display: block; text-align: center; font-size: 10px; margin: 0 0 10px 0; color: #999999;\">Ads<\/span>\r\n<!-- Display-300x250-1 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:300px;height:250px\"\r\n     data-ad-client=\"ca-pub-3838168351244230\"\r\n     data-ad-slot=\"9933646018\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>No Water Reactivity<\/strong><br>Stable in water<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>General Safety:<\/strong> Aluminum chlorohydrate is <strong>not<\/strong> a dangerous water\u2011reactive solid like AlCl\u2083. It is classified as a mild irritant. Consumer antiperspirants containing it have an exceptional safety record.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5.1 Health Effects<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Route of Exposure<\/th><th>Effect<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Inhalation<\/strong><\/td><td>Dust may cause mild respiratory irritation. Not expected to cause pulmonary damage.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Skin Contact<\/strong><\/td><td>Slight irritation possible in sensitive individuals. Prolonged contact with concentrated solution may cause mild redness.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Eye Contact<\/strong><\/td><td>Direct contact with powder or concentrated solution causes stinging and redness.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Ingestion<\/strong><\/td><td>Low toxicity. Large doses may cause gastrointestinal discomfort, nausea, or vomiting.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">5.2 Personal Protective Equipment (PPE)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For industrial handling of powder or concentrated solution:<\/p><div class=\"pai-ad\" style=\"min-height:250px;visibility:hidden;\"><span style=\"display: block; text-align: center; font-size: 10px; margin: 0 0 10px 0; color: #999999;\">Ads<\/span>\r\n<!-- Display-300x250-1 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:300px;height:250px\"\r\n     data-ad-client=\"ca-pub-3838168351244230\"\r\n     data-ad-slot=\"9933646018\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Respiratory:<\/strong> Dust mask (N95) when handling powder.<\/li>\n\n\n\n<li><strong>Hands:<\/strong> Nitrile or rubber gloves.<\/li>\n\n\n\n<li><strong>Eyes:<\/strong> Safety glasses or goggles.<\/li>\n\n\n\n<li><strong>Body:<\/strong> Lab coat or industrial apron.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5.3 First Aid Measures<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Eyes:<\/strong> Rinse with water for 15 minutes. Remove contact lenses.<\/li>\n\n\n\n<li><strong>Skin:<\/strong> Wash with soap and water.<\/li>\n\n\n\n<li><strong>Inhalation:<\/strong> Move to fresh air.<\/li>\n\n\n\n<li><strong>Ingestion:<\/strong> Rinse mouth. Drink water. Do not induce vomiting unless directed by medical personnel.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5.4 Firefighting Information<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Suitable Extinguishers:<\/strong> Water spray, CO\u2082, dry chemical, foam.<\/li>\n\n\n\n<li><strong>Special hazards:<\/strong> None significant. Decomposes at high temperatures (>200\u202f\u00b0C) to release hydrogen chloride fumes.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">6. <strong>Storage and Handling Guidelines<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">6.1 Storage Conditions<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Container:<\/strong> HDPE drums, bags, or IBC totes. For solutions, plastic or lined tanks.<\/li>\n\n\n\n<li><strong>Atmosphere:<\/strong> No special atmosphere required. Keep dry to prevent caking of powder.<\/li>\n\n\n\n<li><strong>Temperature:<\/strong> Store above freezing (solutions freeze around -10\u202f\u00b0C). Avoid prolonged heat above 40\u202f\u00b0C.<\/li>\n\n\n\n<li><strong>Incompatibles:<\/strong> Strong alkalis (causes precipitation of aluminum hydroxide), strong oxidizing agents.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">6.2 Disposal Considerations<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Powder\/solution:<\/strong> Dilute and neutralize if necessary. Dispose as non\u2011hazardous waste in most jurisdictions, but check local regulations.<\/li>\n\n\n\n<li><strong>Empty containers:<\/strong> Rinse thoroughly before recycling.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">7. <strong>Environmental Impact<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ACH is not persistent in the environment. In water treatment, it is consumed by forming flocs that are removed as sludge. Residual aluminum is converted to natural clay\u2011like minerals. Aquatic toxicity is low at neutral pH. However, large spills into water bodies should be avoided as they can temporarily lower pH and stress aquatic life.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">8. <strong>Comparison with Other Aluminum Compounds<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Compound<\/th><th class=\"has-text-align-center\" data-align=\"center\">Formula<\/th><th class=\"has-text-align-center\" data-align=\"center\">Water Reactivity<\/th><th>Primary Use<\/th><th>Safety Profile<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Aluminum Chlorohydrate<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Al\u2082(OH)\u2085Cl<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Stable, soluble<\/strong><\/td><td><strong>Antiperspirant, coagulant<\/strong><\/td><td><strong>Mild irritant<\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Aluminum Chloride (anhydrous)<\/td><td class=\"has-text-align-center\" data-align=\"center\">AlCl\u2083<\/td><td class=\"has-text-align-center\" data-align=\"center\">Violent (HCl gas)<\/td><td>Friedel\u2011Crafts catalyst<\/td><td>Corrosive, water\u2011reactive<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Aluminum Sulfate (alum)<\/td><td class=\"has-text-align-center\" data-align=\"center\">Al\u2082(SO\u2084)\u2083<\/td><td class=\"has-text-align-center\" data-align=\"center\">Exothermic, but stable<\/td><td>Water treatment, paper<\/td><td>Irritant<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Aluminum Hydroxide<\/td><td class=\"has-text-align-center\" data-align=\"center\">Al(OH)\u2083<\/td><td class=\"has-text-align-center\" data-align=\"center\">Insoluble<\/td><td>Antacid, vaccine adjuvant<\/td><td>Very low toxicity<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">9. <strong>Frequently Asked Questions<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: Is aluminum chlorohydrate in antiperspirants dangerous? Has it been linked to cancer or Alzheimer\u2019s?<\/strong><br>A: Extensive scientific reviews (including by the FDA, European Commission, and Cancer Research UK) have found <strong>no convincing evidence<\/strong> linking ACH in antiperspirants to breast cancer or Alzheimer\u2019s disease. The aluminum from skin application is minimally absorbed, and the body efficiently excretes it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: Why does my antiperspirant say \u201caluminum chlorohydrate\u201d on the label?<\/strong><br>A: It is the active ingredient that temporarily reduces sweating. It is regulated as an over\u2011the\u2011counter drug in the US and as a cosmetic ingredient in the EU.<\/p><div class=\"pai-ad\" style=\"min-height:250px;visibility:hidden;\"><span style=\"display: block; text-align: center; font-size: 10px; margin: 0 0 10px 0; color: #999999;\">Ads<\/span>\r\n<!-- Display-300x250-1 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:300px;height:250px\"\r\n     data-ad-client=\"ca-pub-3838168351244230\"\r\n     data-ad-slot=\"9933646018\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: Can I use aluminum chlorohydrate to clean my pool?<\/strong><br>A: No. Pool water treatment uses different aluminum salts (alum or PAC). ACH is suitable for drinking water coagulation but is not formulated for pool use.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: What is the difference between aluminum chlorohydrate and polyaluminum chloride (PAC)?<\/strong><br>A: Both are polymeric aluminum coagulants, but ACH has a higher basicity (OH\/Al ratio ~2.5) and is more pre\u2011hydrolyzed. PAC typically has a lower basicity (1.0\u20132.0). ACH is often more effective and produces less sludge.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">10. <strong>Summary Data Sheet<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\"><strong>Chemical Name<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\">Aluminum Chlorohydrate (ACH)<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Formula<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Al\u2082(OH)\u2085Cl \u00b7 2H\u2082O (typical)<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Appearance<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">White powder or clear solution<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Solubility<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Freely soluble in water<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>pH (50% solution)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">3.5 \u2013 4.5<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Primary Hazard<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Mild irritant (dust\/eyes)<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Primary Uses<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Antiperspirants; drinking water coagulant<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Storage<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Dry, cool area; keep sealed<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Regulatory Status<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">FDA\u2011approved for antiperspirants; NSF\/ANSI 60 for drinking water<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/p><div class=\"pai-ad\" style=\"min-height:250px;visibility:hidden;\"><span style=\"display: block; text-align: center; font-size: 10px; margin: 0 0 10px 0; color: #999999;\">Ads<\/span>\r\n<!-- Display-300x250-1 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:300px;height:250px\"\r\n     data-ad-client=\"ca-pub-3838168351244230\"\r\n     data-ad-slot=\"9933646018\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div><script>document.addEventListener(\"DOMContentLoaded\",function(){\n        if(window.innerWidth <= 768){\n            if (\"immediate\" === \"delay\") {\n                setTimeout(function(){document.querySelectorAll(\".pai-ad\").forEach(el=>el.style.visibility=\"visible\")},0);\n            } else if (\"immediate\" === \"scroll\") {\n                window.addEventListener(\"scroll\",function(){\n                    let s=window.scrollY\/(document.body.scrollHeight-window.innerHeight);\n                    if(s>0.1){\n                        document.querySelectorAll(\".pai-ad\").forEach(el=>el.style.visibility=\"visible\");\n                    }\n                });\n            } else {\n                document.querySelectorAll(\".pai-ad\").forEach(el=>el.style.visibility=\"visible\");\n            }\n        } else {\n            document.querySelectorAll(\".pai-ad\").forEach(el=>el.remove());\n        }\n    });<\/script>","protected":false},"excerpt":{"rendered":"<p>Aluminum chlorohydrate, often abbreviated as ACH, is a water-soluble, polymeric aluminum species that sits comfortably between the violent reactivity of anhydrous aluminum chloride and the benign inertness of aluminum hydroxide. It appears as a white to off-white powder or a clear to pale yellow solution. Unlike its anhydrous halide cousins, ACH is deliberately designed to &#8230; <a title=\"Aluminum Chlorohydrate (Al\u2082(OH)\u2085Cl): The Complete Guide\" class=\"read-more\" href=\"https:\/\/aluminiummagazine.com\/mag\/aluminium\/compounds\/aluminium-chlorohydrate-antiperspirant-uses.html\" aria-label=\"Read more about Aluminum Chlorohydrate (Al\u2082(OH)\u2085Cl): The Complete Guide\">Read more<\/a><\/p>\n","protected":false},"author":12,"featured_media":17949,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4155],"tags":[4141,4142],"class_list":["post-17855","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-compounds","tag-aluminium-compounds","tag-aluminum-formula"],"_links":{"self":[{"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/posts\/17855","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/comments?post=17855"}],"version-history":[{"count":0,"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/posts\/17855\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/media\/17949"}],"wp:attachment":[{"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/media?parent=17855"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/categories?post=17855"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/tags?post=17855"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}