Official EU label nameGlossary entry 7743

CUPROUS OXIDE

This record confirms an official common ingredient name for EU cosmetic product labelling. It does not by itself confirm that the substance is permitted, unrestricted or safe.

Global evidence snapshot

The resolved identity has matching regulatory evidence in 0 of 13 indexed market datasets: 0 country records and 0 EU Annex records. Every result and evidence gap is listed below.

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Resolved identifiers

Resolved substance identity

CAS:1317-39-1

EC:215-270-7

Ingredient index records:

CUPROUS OXIDE

Cosmetic functions: SKIN CONDITIONING

Cuprous Oxide is the inorganic oxide. See "Regulatory and Ingredient Use Information," for Colorants in Volume 1, Introduction, Part A.

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1 matched or reported name

CUPROUS OXIDE

Regulatory evidence across markets

None of the 13 markets tracked here holds an imported rule under the name CUPROUS OXIDE.

That is a statement about this inventory, not about the law: no imported rule is not evidence that a substance is permitted. A rule may exist under a different name, under a CAS or EC number this glossary entry does not carry, or in a dataset not yet imported.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 1317-39-1

CAS 1317-39-1PubChem CID 18346908

Copper oxide (Cu2O)

Copper(I) oxide is an oxide of copper. It is found naturally as the mineral cuprite and is formed by the slow oxidation of copper when exposed to oxygen. Copper(I) oxide is commonly used as a pigment, a fungicide, and an antifouling agent for marine paints. It is also a semiconductor. Copper is a chemical element with the symbol Cu and atomic number 29. Copper is an essential elements in plants and animals as it is required for the normal functioning of more than 30 enzymes. It occurs naturally throughout the environment in rocks, soil, water, and air. (L277, L278, L288) — Toxin and Toxin Target Database (T3DB)

IUPAC name: copper;oxocopper

Molecular formula: Cu2O
Molecular weight: 143.09 g/mol
Exact mass: 141.854109 Da
Topological polar surface area: 17.1 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 1
Covalent units: 2
Defined stereocentres: 0

Also known as

(cupriooxy)copperRefChem:1082154Brown copper oxideCaocobreCaswell No. 266CI 77402Copoxcopper (I) oxide

16 more reported names

Copper hemioxideCopper NordoxCopper oxide, redCopper protoxideCopper SandozCopper sardezCopper suboxideCopper(1+) oxideCopper(I) oxideCopper-sandozCupper oxideCupramarCuprocideCuprous Oxide Type TwoCuprous Oxide, AA GradeDicopper monoxide

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Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Additional authoritative substance research

Each link searches that source for this identity. A link is a research route, not a claim that the source holds an exact record. What each source is, and its legal weight

Cosmetic Ingredient Review safety assessments FDA Global Substance Registration System ILO/WHO International Chemical Safety Cards Japan NITE-CHRIP NIOSH Pocket Guide to Chemical Hazards OECD eChemPortal US EPA CompTox CTX APIs

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Official source and scope

Imported from Commission Implementing Decision (EU) 2025/1175 (dataset version EU 2025/1175). The glossary supplies common ingredient names for the ingredient list required by Article 19(1)(g); it is not an approval or safety list.

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