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InventoryRef 7421524/05/2018

ALUMINUM HYDROXIDE

Aluminium hydroxide

ALUMINUM HYDROXIDE is linked to 1 EU annex record on this page.

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Regulatory evidence by market

This matrix separates verified ingredient rules from sources that are mapped but not yet imported. No imported rule does not mean the ingredient is permitted.

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MarketEvidence statusRecordsSource language
European UnionEvidence linked
Positive-list entry with conditions
Open this evidence		1English and EU languages
Great BritainSource mapped
Official source mapped; ingredient rule not imported
0English
CanadaSource mapped
Official source mapped; ingredient rule not imported
0English and French
New ZealandSource mapped
Official source mapped; ingredient rule not imported
0English
ASEANSource mapped
Official source mapped; ingredient rule not imported
0English and national languages
ChinaSource mapped
Official source mapped; ingredient rule not imported
0Chinese with selected English material
JapanSource mapped
Official source mapped; ingredient rule not imported
0Japanese; official English translation available
South KoreaSource mapped
Official source mapped; ingredient rule not imported
0Korean with some English names
United StatesSource mapped
Official source mapped; ingredient rule not imported
0English
AustraliaSource mapped
Official source mapped; ingredient rule not imported
0English
BrazilSource mapped
Official source mapped; ingredient rule not imported
0Portuguese with INCI crosswalks
IndiaSource mapped
Official source mapped; ingredient rule not imported
0English and Hindi
Saudi ArabiaSource mapped
Official source mapped; ingredient rule not imported
0Arabic and English

Chemical identity and properties

PubChem 2D chemical structure for CAS 21645-51-2
CAS 21645-51-2PubChem CID 10176082

Aluminum Hydroxide

Aluminum hydroxide is an inorganic salt used as an antacid. It is a basic compound that acts by neutralizing hydrochloric acid in gastric secretions. Subsequent increases in pH may inhibit the action of pepsin. An increase in bicarbonate ions and prostaglandins may also confer cytoprotective effects. — DrugBank

IUPAC name
aluminum trihydroxide
Molecular formula
AlH3O3
Molecular weight
78.004 g/mol
Exact mass
77.9897574 Da
Topological polar surface area
3.0 Ų
Hydrogen-bond donors
3
Hydrogen-bond acceptors
3
Covalent units
4
Defined stereocentres
0

Also known as

Hydrated aluminaaluminum hydrateDried aluminium hydroxideAluminum hydroxide, driedAluminium hydroxide, driedAluminum hydroxide gel, driedAluminium hydroxide gel, driedHydroxyde d' aluminium
16 more reported names
aluminium(III) hydroxideDi-mu-hydroxytetrahydroxydialuminumAlum AdjuvantBasalgelDermadroxSarpepDermaMedALterna GELAlumane TrihydrateAlumina, HydratedHydroxide, AluminumASTONEAGRANTENDERGRANAluminum oxide hydratedRefChem:5538Aluminium hydroxide (Al(OH)3)
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Inventory details for ALUMINUM HYDROXIDE

INCI name

ALUMINUM HYDROXIDE

INN name

aluminium hydroxide

Description

Aluminium hydroxide

Record provenance

Inventory reference
74215
Imported identity
ALUMINUM HYDROXIDE
Source update
24/05/2018
European Commission CosIng source notes
Annex IV Shared CAS number
Entry 118

CI 77002

CAS: 1332-73-6; 21645-51-2; 8011-94-7
EC: 215-573-4; 244-492-7; -

Key data

CAS
21645-51-2
EC
244-492-7
Restriction
—
Function
HUMECTANT
Retaining and/or preserving the moisture in a product during use.
OPACIFYING
Reducing transparency or translucency of cosmetics.
SKIN CONDITIONING - EMOLLIENT
Acting as lubricants on the skin surface providing the skin with a soft and smooth appearance.
SKIN PROTECTING
Helping to avoid harmful effects to the skin from external factors.
VISCOSITY CONTROLLING
Increasing or decreasing the viscosity (thickness) of cosmetics.

Official EU ingredient-name evidence

The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.

#1588 · ALUMINUM HYDROXIDE

Ingredients with overlapping formulation functions

ALUMINUM CAPRYLATEANTICAKING, EMULSION STABILISING, OPACIFYING, VISCOSITY CONTROLLING
ALUMINUM DILINOLEATEANTICAKING, EMULSION STABILISING, OPACIFYING, VISCOSITY CONTROLLING
ALUMINUM DIMYRISTATEANTICAKING, EMULSION STABILISING, OPACIFYING, VISCOSITY CONTROLLING
ALUMINUM DISTEARATEANTICAKING, EMULSION STABILISING, OPACIFYING, VISCOSITY CONTROLLING
ALUMINUM ISOSTEARATEANTICAKING, EMULSION STABILISING, OPACIFYING, VISCOSITY CONTROLLING
ALUMINUM ISOSTEARATES/LAURATES/PALMITATESANTICAKING, EMULSION STABILISING, OPACIFYING, VISCOSITY CONTROLLING
ALUMINUM ISOSTEARATES/LAURATES/STEARATESANTICAKING, EMULSION STABILISING, OPACIFYING, VISCOSITY CONTROLLING
ALUMINUM ISOSTEARATES/MYRISTATESANTICAKING, EMULSION STABILISING, OPACIFYING, VISCOSITY CONTROLLING

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicalsPubChem PUG RESTEU Safety Gate cosmetic product alertsECHA CHEMUS EPA CompToxCosmetic Ingredient Review safety assessmentsFDA Global Substance Registration SystemILO/WHO International Chemical Safety CardsJapan NITE-CHRIPNIOSH Pocket Guide to Chemical HazardsOECD eChemPortal

How ALUMINUM HYDROXIDE appears in the CosIng inventory

The CosIng inventory lists ALUMINUM HYDROXIDE as a cosmetic ingredient and this page links it to 1 annex record. The inventory entry captures names and identifiers, while the annex record shows where the substance is prohibited, restricted or positively listed in EU cosmetics law.

ALUMINUM HYDROXIDE is also tagged with 5 cosmetic functions in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

ALUMINUM HYDROXIDE appears in the EU CosIng inventory and has linked annex records. Check the annex records above for applicable restrictions, concentration limits and conditions of use. Annex II listing means prohibited; Annex III means restricted; Annexes IV, V and VI mean permitted under specified conditions.

According to the EU CosIng inventory, ALUMINUM HYDROXIDE carries the following function designation(s):

CAS 21645-51-2 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.
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Source note for ALUMINUM HYDROXIDE

This page combines the CosIng inventory entry for ALUMINUM HYDROXIDE with 1 linked Annex II–VI record from the local dataset built from public European Commission cosmetic ingredient materials.

Use this inventory page to research ALUMINUM HYDROXIDE and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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