Aluminium sulfate (anhydrous) is an aluminium sulfate that contains no water of crystallisation.
Definition
US FDA substance register · UNII I7T908772F · registered name ALUMINUM SULFATE ANHYDROUS · single chemical substance
Aluminium sulfate (anhydrous) is an aluminium sulfate that contains no water of crystallisation.
Source: PubChem
Cosmetic roles
Safety & regulatory references
Argentina · Brazil
- Field of application and/or use : Antitranspirants.
- Maximum concentration permitted at final product : 8% as aluminum sulfate buffered with 8% aluminum lactate.
- Other limitations and requirements : Do not use in sprayable systems (aerosols and sprays)
- Use conditions and warnings that must appear on the label : -Do not apply to irritated or damaged skin. - Discontinue use if irritation.
Source: MFDS (Korea) cosmetic regulatory information
Not classified under Korea’s toxic-substance GHS list · existing chemical substance
More data — names, identifiers, properties, test records, literature
Official labels & definitions
JCIA labelling name 硫酸Ａｌ: 本品は、硫酸（＊）のアルミニウム塩であり、次の化学式で表される。
Source: JCIA labelling names (Japan)
Names & identifiers
- CAS No.chemical registry number
- 10043-01-3
- EC No.EU chemical inventory number
- 233-135-0
- DTXSIDUS EPA chemical ID
- DTXSID2040317
- DTXCIDUS EPA compound ID
- DTXCID0020317
- IUPAC
- Aluminium sulfate (2/3)
- Molecular formula
- Al2O12S3
- Molecular weight
- 342.13 g/mol
Measured properties
- Appearance
- Anhydrous aluminum sulfate is a white crystalline solid. Aluminum sulfate is also obtained as an 18-hydrate Al2(SO4)3.18H2O. Both forms are soluble in water, noncombustible, and nontoxic. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment. It is used in paper making, in firefighting foams, and in sewage treatment and water pu · Aluminum sulfate, solution appears as a clear colorless aqueous solution. Noncombustible. Nontoxic. Density 10.9 lb / gal. Used in paper making, in firefighting foams, as a fireproofing agent, in sewage treatment and water purification.
- Odour
- ODORLESS · odourless
- Boiling point
- 214 °F at 760 mmHg (USCG, 1999) · 1600
- Melting point
- 3.9 °F (USCG, 1999) · 700
- Solubility
- 86.9 g/ 100 ml · Freely soluble in water, insoluble in ethanol
- Density
- 2.71 at 68 °F 1.7 at 20 °C (USCG, 1999) - Denser than water, will sink · 1.29 to 1.34 at 59 °F (USCG, 1999)
- Stability
- Stable in air. · Low melting solids or colorless, volatile liquids. /Alkylaluminum halides/
- pH
- 2,9 or above (5 % solution) · Aq soln (1 g/1 ml water) not less than 2.9
- Colour
- white
- Melting/freezing point
- 770 ℃(calc.)
- Vapour pressure
- (31 mbar at 0 C)
- Relative density
- 1.61
- Decomposition temperature
- 770 ℃
- Molecular weight
- 342.14
Values measured on the substance itself. The KOSHA data are a reference for writing and reviewing safety data sheets, not a specification for a commercial raw material.
Source: PubChem · KOSHA safety data sheets (Korea)
What products actually use it for
What the 53 products reported to the US EPA with this ingredient use it for. Products outside cosmetics are included, so the top few rows are its main uses.
- Processing aids not otherwise specified7
- Soil amendments6
- Flocculating agent5
- pH regulating agent4
- Solids separation (precipitating) agent, not other4
- Filler3
- Dye2
- Cloud-point depressant2
19 other uses
- Sizing agent2
- Propellants, non-motive (blowing agents)1
- Chelating agent1
- Astringent (EPA)1
- Catalyst1
- Softener and conditioner1
- Chemical reaction regulator1
- Deodorizer1
- Surface modifier1
- Coalescing agent1
- Reducing agent1
- Antiperspirant (EPA)1
- Stabilizing agent1
- Emulsifier1
- Intermediate1
- Waterproofing agent1
- Fixing agent (mordant)1
- Aerating and deaerating agents1
- Flux agent1
Source: US EPA CompTox dashboard
Irritation and sensitisation studies
1 skin studies and 2 eye studies are on record.
The study conclusions largely agree (100%). These tests are on the raw material itself; irritation at the amount in a finished product is a different question.
See all 3 studies
- Category 6.3A (Category 2)
Skin Irritation · Read Across - Category 6.4A (Category 2A)
Eye Irritation · Read Across - Serious eye damage/eye irritation - Category 2
Eye Irritation · Screening
Source: US EPA CompTox dashboard
Related literature
- Assessment of Quicklime and Aluminum Sulfate for pH Neutralization and Organic Matter Reduction in Dug Well Water in Jongaya, Indonesia · 2025
- Environmental Risk Assessment of Liquid Aluminum Sulfate Water Treatment Agent Prepared from Waste Sulfuric Acid in the Integrated Circuit Industry · 2025
- Preparation and hydration mechanism of aluminum formate/aluminum sulfate based alkali-free composite accelerator for sprayed concrete · 2022
- Histological study on the acute injection of aluminum sulfate on different organs of rats · 2020
- Aluminum sulfate significantly reduces the skin test response to common allergens in sensitized patients · 2006
Linked databases 21
- Australian Industrial Chemicals Inventory (AICIS)
- ChEBI
- ChEMBL
- China inventory of existing ingredients (IECIC)
- EU CosIng ingredient list 2
- JCIA labelling names (Japan)
- Korea Cosmetic Association ingredient dictionary
- Korea toxic substances GHS register (NIER)
- KOSHA safety data sheets (Korea)
- MFDS (Korea) cosmetic ingredient register 2
- MFDS (Korea) cosmetic regulatory information 2 3
- NIST Chemistry WebBook
- PubChem 2
- Tlooto literature search 2 3 4 5
- UniChem cross-reference IDs
- US EPA CompTox dashboard 2
- US EPA DSSTox chemical database
- US FDA substance registration (GSRS)
- US FDA Unique Ingredient Identifier (UNII)
- Wikidata
- Wikipedia · Korean · English · Japanese · Chinese