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CAS 21908-53-2

CAS 21908-53-2 matches 0 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 21908-53-2
CAS 21908-53-2PubChem CID 30856

Mercuric oxide

Mercuric oxide, [solid] appears as red or orange-red odorless, dense crystalline powder or scales, yellow when finely powdered. Used as a chemical intermediate for mercury salts, organic mercury compounds, and chlorine monoxide; antiseptic in pharmaceuticals; component of dry cell batteries; pigment and glass modifier; fungicide; preservative in cosmetics; analytical reagent; formerly used in antifouling paints. (EPA, 1998) — CAMEO Chemicals

IUPAC name
oxomercury
Molecular formula
HgO
Molecular weight
216.59 g/mol
Exact mass
217.965558 Da
Topological polar surface area
17.1 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
1
Covalent units
1
Defined stereocentres
0

Also known as

Mercury(II) oxideMercuric oxide, redSantarRed PrecipitateRed mercuric oxideMercury oxide (HgO)Mercuric oxide, yellowSantar M
16 more reported names
Yellow precipitateMercuric oxide redNatural montroyditeMercury(2+) oxideRed oxide of mercuryGelbes quecksilberoxydHydrargyrum oxid flavYellow mercuric oxideMercuric oxide (red)Oxide mercurique jauneMercuric oxide (HgO)Caswell No. 544AYellow oxide of mercuryOxido amarillo de mercurioOxyde de mercureEPA Pesticide Chemical Code 052102
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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 21908-53-2

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How CAS 21908-53-2 is used on this site

CAS 21908-53-2 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 0 EU annex records share 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 21908-53-2 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.