Copper Oxide Red

Copper Oxide Red, also known as cuprous oxide or copper(I) oxide (Cu₂O), is a red to reddish-brown crystalline powder used in ceramics, antifouling paints, and pyrotechnics. It is the reduced form of black copper(II) oxide (CuO), converting to CuO in oxidizing conditions.​

Identity and Composition

Chemical name: Copper(I) oxide; cuprous oxide.​

Molecular formula: Cu₂O; molecular weight 143.09 g/mol.​

Grade specifications: Typically 96–99% purity, fine powder with particle size influencing color (yellowish for smaller particles).​

Physical Properties

Appearance: Red, yellow, or brown solid (polycrystalline).​

Density: 5.75–6.0 g/cm³.​

Melting point: 1232 °C; boiling point: 1800 °C.​

Solubility: Insoluble in water; soluble in ammonia, acids (HCl, H₂SO₄, HNO₃).​

Typical Uses

Antifouling paints for marine applications.​

Pigment in ceramics/glazes (green colors in oxidation), glass, and enamels.​

Catalyst, semiconductor, antifungicide, and pyrotechnics for red flames.​

Handling and Safety

Stable in dry air but oxidizes in moist air to CuO; toxic if inhaled/swallowed, irritant. Store sealed away from acids/reductants.​

For catalog purposes: “Copper Oxide Red (Cu₂O), 96–99%, red crystalline powder, mp 1232 °C, insoluble in water, for paints/ceramics; oxidizes in moist air.”​