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CAS 1 record

CAS 21645-51-2

CAS 21645-51-2 matches 1 EU annex record across Annex II–VI of Regulation 1223/2009.

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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)
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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.

Records for CAS 21645-51-2

1 total
No records found for this CAS number.

How CAS 21645-51-2 is used on this site

CAS 21645-51-2 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 1 EU annex record shares this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 21645-51-2 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.