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Cosmetic-grade Hydroxyaluminum Chloride, scientifically classified under the IUPAC nomenclature as aluminum chlorohydrate (ACH) and designated with the empirical formula Al2(OH)nCl6-n (where n is typically around 5), functions as the cornerstone active ingredient in global underarm sweat regulation and deodorizing solutions. In contrast to industrial coagulants used in wastewater treatment, cosmetic-grade ACH requires meticulous molecular design, high basicity profiles (exceeding 82%), and strict limits on trace heavy metal concentrations to ensure physiological safety and formulate stable, non-irritating skin emulsions.
Regulatory Compliance and Heavy Metal Tolerance limits: Strict quality parameters require Lead (Pb) ≤ 10 ppm, Arsenic (As) ≤ 2 ppm, Iron (Fe) ≤ 50 ppm, and Mercury (Hg) ≤ 1 ppm. Wuxi BS operates dedicated cleanroom synthesis lines to consistently achieve levels significantly cleaner than standard USP/NF monographs.
The performance of Hydroxyaluminum Chloride as an antiperspirant is fundamentally determined by its basicity value (calculated as the molar ratio of [Al]/[Cl]). At basicity levels above 82%, ACH forms specialized polymeric species known as Al13 and Al30 Keggin ions. Upon contact with sweat inside the eccrine gland ducts, the shift in pH causes these pre-formed polymeric complexes to cross-link into a temporary, safe physical plug. This molecular mechanism naturally restricts perspiration without disrupting the body's subcutaneous thermoregulation systems.
| Parameters (Cosmetic Grade Powder) | Standard Specification | Analytical Method Reference |
|---|---|---|
| Alumina Content (Al2O3) | 46.0% - 48.5% | ICP-OES / Complexometric Titration |
| Aluminum (Al) Content | 24.3% - 25.6% | Gravimetric Calcination |
| Chloride (Cl) Content | 15.8% - 17.5% | Silver Nitrate Potentiometric Titration |
| Basicity (Al/Cl Molar Ratio) | 82% - 85% (1.9:1 to 2.1:1 Molar) | Acid-Base Back Titration |
| Iron (Fe) Impurity | ≤ 15 ppm | Spectrophotometric / Phenanthroline Method |
| Arsenic (As) | ≤ 2 ppm | Atomic Absorption Spectroscopy (AAS) |
| pH Value (15% w/w Solution) | 4.0 - 4.5 | Glass Electrode Method |
The modern cosmetics industry is undergoing a major transition driven by regulatory updates and changing consumer preferences. In B2B chemical sourcing, this has created a strong demand for high-purity chemical bases that do not contain unnecessary auxiliary additives. B2B procurement managers now focus on sourcing raw materials that minimize skin irritation while optimizing the viscosity and shelf stability of underarm roll-ons, aerosols, sticks, and creams.
Wuxi BS leverages two primary chemical pathways to refine Hydroxyaluminum Chloride into stable solid phases: Advanced Spray Drying and Controlled Crystallization. The spray drying route atomizes high-basicity liquid ACH within a turbulent flow of hot air, creating hollow microspheres with excellent flowability and rapid dissolution kinetics. The crystallization pathway provides highly defined crystalline structures preferred for solid-stick antiperspirants, ensuring consistent hardness profiles and steady active release rates.
Cosmetic-grade Hydroxyaluminum Chloride is incredibly versatile and can be formulated into a wide variety of personal care formats. Depending on the final application, we customize physical particle size distributions, bulk densities, and solubility speeds:
Requires ultra-fine particle sizes (<10 microns) to prevent valve clogging and ensure soft, electrostatic mist delivery on the skin.
Designed for optimal oil-in-water stability. We adjust basicity levels to prevent phase separation and long-term formula splitting.
Engineered for high compatibility with cosmetic waxes and silicones, maintaining transparency and minimizing white residue.
Global cosmetic compliance is complex. Wuxi BS ensures all cosmetic-grade ACH shipments are fully documented, allowing B2B buyers to easily pass standard regulatory audits:
We continue to invest in R&D to develop advanced active ingredients. Our focus areas include: Aluminum-Zirconium Complexes (AZG) for enhanced efficacy, organic-inorganic hybrid formulations for sensitive skin, and bio-based stabilizers that reduce reliance on synthetic emulsifiers. By expanding our laboratory testing facilities in Wuxi, we support cosmetic formulation teams with pilot-scale batching and stability testing services.
Founded in 1998, Wuxi BS Water Treatment Chemicals Co., Ltd. is a verified technology leader specializing in high-purity inorganic coagulants, flocculants, and advanced cosmetic-grade active ingredients. Combining 27 years of manufacturing experience with modern production lines, we support B2B clients worldwide with robust logistics, consistent quality control, and custom formulation solutions.
We configure technical parameters, liquid solid packaging sizes, and shipping configurations to align with your manufacturing requirements.
Technical answers to key product questions from our chemical engineering team.
The main differences are chemical purity, basicity, and heavy metal concentrations. Cosmetic-grade Hydroxyaluminum Chloride requires a high basicity index (generally >82%) to optimize antiperspirant performance. It must also have low heavy metal concentrations (lead ≤ 10 ppm, arsenic ≤ 2 ppm, iron ≤ 15 ppm) to prevent skin irritation and formula discoloration.
When applied to the skin, Hydroxyaluminum Chloride dissolves in underarm sweat. The higher pH of sweat causes the active ingredients to form gel-like polymeric complexes that temporarily plug eccrine sweat ducts. These plugs naturally wash off through washing and skin renewal.
Because cosmetic-grade ACH is highly hygroscopic, it should be stored in dry, cool warehouses with temperatures under 30°C. Keep containers sealed tightly. We package our dry products in heat-sealed PE inner liners inside robust fiber drums or multi-ply moisture-barrier craft bags.
Yes. Every outgoing batch undergoes analytical testing at our in-house QC laboratory. We issue a comprehensive Certificate of Analysis (COA) specifying Al2O3 content, basicity, pH, particle size distribution, and heavy metal concentrations.
Have questions about technical specifications, sample requests, or custom pricing? Get in touch with our chemical experts today.
We review and respond to standard technical specifications and commercial quote requests within 12 working hours.
In addition to cosmetic actives, we supply wastewater coagulants, color-removal agents, and specialty flocculants to support global chemical manufacturing operations.
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