Dicopper oxide

Endpoint summary

Additional information

The physical and chemical properties are summarised in the following table:

Property	Value	Remarks
Physical state at 20°C and 101.3 kPa	Solid	Form: Powder Colour: Orange Odour: Odourless
Melting/freezing point	> 673 K	ca. 101.72 kPa
Boiling point	Not applicable	Boiling point will occur at temperatures greater than 360°C, based on determination of melting point.
Relative density	5.87
Vapour pressure	Not applicable	It is not possible to determine a vapour pressure due to the high melting point (and hence the high boiling point) of cuprous oxide.
Surface tension	Not applicable	Not required for substances with a water solubility of < 1 mg/l.
Water solubility	28.6 g/l pH 4.0 6.39x10^-4g/l (pH 6.5 – 6.6) 5.39x10^-4g/l (pH 9.7 – 9.8)	Tested at 20.0 ± 0.5 ºC
Partition coefficient n-octanol/water (log value)	Not applicable	The octanol:water partition coefficient, Pow, is defined as the ratio of the equilibrium concentrations of a dissolved substance in each of the phases in a two phase system consisting of octanol and water. It is usually expressed on a log scale. It is a key parameter in studies of the environmental fate of organic substances, indicating the potential for bioaccumulation and soil absorption. However, the mechanisms of absorption of Cu^2+into organic matter and living cells are understood to be different from those traditionally attributed to carbon-based substances and the parameter therefore has little relevance to ionic copper. The parameter is therefore not considered to be relevant to cuprous oxide.
Flash point	Not applicable	A flash-point value was not determined as this is not relevant to solid compounds such as cuprous oxide.
Flammability	Not applicable	Based on the high melting point for cuprous oxide, a determination of the flammability, including auto-flammability, is unnecessary.
Explosive properties	Not applicable	Based on the chemical composition and experience in use, it is considered that this test would give a negative result for cuprous oxide.
Self-ignition temperature	Not applicable	Based on the high melting point for cuprous oxide, a determination of the flammability, including auto-flammability is unnecessary.
Oxidising properties	Not applicable	Based on the chemical composition and experience in use, it is considered that cuprous oxide would not have oxidising properties.
Granulometry	Volume-rated particle size distribution by laser diffraction: D(v,0.1) 0.374 µm; D (v,0.5) 1.53 µm; D(v,0.9) 3.42 µm. Number-rated particle size distribution by laser diffraction: D(n,0.1) 0.125 µm; D (n,0.5) 0.174 µm; D(n,0.9) 0.342 µm.	Joint registrants that produce or import dicopper oxide corresponding to this specification are able to refer to the Lead Registrant's granulometry data for the purpose of REACH registration. The material does not fall under the category of nanomaterial (50% < 0.1 µm based on particle number). The Exposure Scenarios developed under REACH are based on the worst-case assumption that 100% of any material becoming airbourne is respirable.
Stability in organic solvents and identity of relevant degradation products	Not applicable	As stated in the REACH regulations, the study does not need to be conducted if the substance is inorganic.
Dissociation constant	Not applicable	No testing is possible by Method 112 of the OECD Guidelines for the Testing of Chemicals, due to the negligible solubility of the test material in water. Any addition of acid to solutions of the test material would result in reaction with the cuprous oxide.
Viscosity	Not applicable	A determination of viscosity is not applicable to a solid, such as cuprous oxide
Auto flammability	Not applicable	Based on the high melting point for cuprous oxide, a determination of the flammability, including auto-flammability is unnecessary.