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Annex IV Entry 118 14/08/2020

Aluminium hydroxide sulphate

CI 77002

Aluminium hydroxide sulphate appears in Annex IV as a positive-list colorant entry for EU cosmetics.

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Permitted colorant— Annex IV, EU Regulation 1223/2009
Entry: 118

Chemical identity and properties

PubChem 2D chemical structure for CAS 1332-73-6
CAS 1332-73-6PubChem CID 159381

Aluminum hydroxide sulfate (Al(OH)(SO4))

IUPAC name
aluminum;hydroxide;sulfate
Molecular formula
AlHO5S
Molecular weight
140.05 g/mol
Exact mass
139.9360077 Da
Topological polar surface area
89.6 Ų
Hydrogen-bond donors
1
Hydrogen-bond acceptors
5
Covalent units
3
Defined stereocentres
0

Also known as

Aluminium hydroxide sulphateUNII-9QO62ZS7VOaluminum hydroxide sulfate(1:1:1)9QO62ZS7VOAluminum monohydroxide monosulfateAluminum monohyddroxide monosulfateEINECS 215-573-4RefChem:111674
3 more reported names
STNCDALPBBWSTC-UHFFFAOYSA-KAluminium hydroxide sulfate (1/1/1)Tetraaluminium hexahydroxide tris(sulphate)
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.

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.

Record details

Colour index or glossary

CI 77002

Chemical name

Aluminium hydroxide sulphate

Chemical / IUPAC name

Aluminium hydroxide sulphate

Color

White

Regulatory information

Regulation

(EC) 2009/1223

See every entry this act set

Identified ingredients

Key data

CAS
1332-73-6; 21645-51-2; 8011-94-7
EC
215-573-4; 244-492-7; -
Annex
IV
Entry number
118

Inventory links for Aluminium hydroxide sulphate

Inventory Restriction reference
Ref 32812

CI 77002

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

Direct matches are limited for this record, so nearby entries from Annex IV are shown as well.

Annex IV 117
Nearby record in the same annex

CI 77000

CAS: 7429-90-5
EC: 231-072-3
Annex IV 119
Nearby record in the same annex

CI 77004

CAS: 1302-78-9
EC: 215-108-5
Annex IV 116
Nearby record in the same annex

CI 75810

CAS: 11006-34-1; 8049-84-1
EC: 234-242-5; 232-471-5 ; 215-800-7 / 207-536-6 / 208-272-4 / 287-483-3 / 239-830-5 / 246-020-5
Annex IV 120
Nearby record in the same annex

CI 77007

CAS: 12769-96-9; 1317-97-1; 57455-37-5
EC: 235-811-0; -; -;
Annex IV 115
Nearby record in the same annex

CI 75470

CAS: 1260-17-9; 1343-78-8; -
EC: 215-724-4; 215-680-6; 215-023-3
Annex IV 121
Nearby record in the same annex

CI 77015

CAS: 1309-37-1/1332-25-8
EC: - / 310-127-6
Annex IV 114
Nearby record in the same annex

CI 75300

CAS: 458-37-7; 94875-80-6
EC: 207-280-5; -
Annex IV 122
Nearby record in the same annex

CI 77120

CAS: 7727-43-7
EC: 231-784-4
Annex IV 113
Nearby record in the same annex

CI 75170

CAS: 73-40-5
EC: 200-799-8
Annex IV 123
Nearby record in the same annex

CI 77163

CAS: 7787-59-9
EC: 232-122-7
Annex IV 112
Nearby record in the same annex

CI 75135

CAS: 3763-55-1
Annex IV 124
Nearby record in the same annex

CI 77220

CAS: 471-34-1
EC: 207-439-9 / 215-279-6

What Annex IV means for Aluminium hydroxide sulphate

Aluminium hydroxide sulphate is an approved colorant listed in Annex IV of EU Cosmetics Regulation 1223/2009. Only colorants on this positive list may be used to colour cosmetic products on the EU market.

Some colorants in Annex IV are restricted by product type — for example, prohibited from use around the eyes or in products applied to mucous membranes. Check the product type and conditions fields above before use.

This record is linked to 2 CosIng inventory ingredients for name and identifier cross-reference. The page also surfaces 12 related annex records with overlapping identifiers, annex logic or naming patterns.

Compliance checklist

  • Confirm colorant is used only in permitted product types listed above.
  • Record the Colour Index number and CAS identifier in the ingredient declaration.

Frequently asked questions

Yes. Aluminium hydroxide sulphate is included in Annex IV of EU Cosmetics Regulation 1223/2009 as a permitted colorant. Only colorants on this positive list may be used to colour cosmetic products in the EU. Check the product type conditions above for any use restrictions.

CAS 1332-73-6; 21645-51-2; 8011-94-7 is the unique numerical identifier assigned to Aluminium hydroxide sulphate by the Chemical Abstracts Service. In cosmetic compliance work, the CAS number is used to cross-reference the substance across regulatory databases, raw material specifications and safety assessment reports. Multiple EU annex entries may share the same CAS number if the same substance appears under different conditions or in different annexes.

Use the INCI Checker tool on this site to paste your full ingredient list (INCI) and scan it against all Annex II–VI entries. The tool highlights any ingredients that match restricted, prohibited or allergen-flagged records. This is useful for rapid compliance screening of finished product formulas or raw material declarations.
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Source note for Annex IV record Aluminium hydroxide sulphate

This page summarizes one Annex IV record for Aluminium hydroxide sulphate from public European Commission cosmetic materials and adds linked inventory or identifier matches when available.

Use this record page to review Annex IV conditions for Aluminium hydroxide sulphate, but confirm any final regulatory decision against the current official annex wording and source files.

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