Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

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:Dark blue (Munsell colour value of 5PB 2.5/1) at 21.0 ± 0.5 °C.

Odour: Odourless.

Melting/freezing point

507 °C.

Melts with transformation.

Boiling point

Not applicable.

Not required for substances with a melting point greater than 300°C.

Relative density

4.76 g/cm3.

Temperature: Near room temperature.

Vapour pressure

Not applicable.

The substance is inorganic in nature and as such has negligible vapour pressure at environmentally relevant temperatures.

Surface tension

Not applicable.

Test not conducted because the water solubility of copper sulphide is less than 1 mg/L.

Water solubility

Not applicable.

Copper sulphide is known to be very insoluble in water, and measurement of actual solubility is problematic. Theoretical estimates range from 3.31E-11µg/L to 2.4E-10µg/L. Analytical limits of determination for copper in water samples typically range between 0.1 and 10 µg/l, depending on the purity of the water and instrument sensitivity. Given the orders of magnitude difference between the expected solubility and the analytical constraints, it is not technically feasible to provide experimental data to support the water solubility of copper sulphide.

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 Cu2+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 copper sulphide.

Flash point

Not applicable.

Not required as the substance is solid.

Flammability

Not flammable.

A preliminary screening test failed to ignite the sample in a test conducted in accordance with EU Method A.10. Based on experience in use, copper sulphide is not pyrophoric (EU Method A.13) and is not flammable in contact with water (EU Method A.12).

Explosive properties

Not explosive.

Copper sulphide was assessed for chemical groups that imply explosive properties. Since none of these are present in the chemical structure of the test substance, copper sulphide is considered not to be explosive.

Self-ignition temperature

Copper sulphide has been determined to have a relative self-ignition temperature of 260 °C.

 

Oxidising properties

No oxidising properties.

Copper sulphide was assessed for chemical groups that imply oxidising properties. Since none of these are present in the chemical structure of the test substance, copper sulphide is considered not to possess any oxidising properties.

Granulometry

Five different copper compounds were subjected to total particle size analysis, resulting in d50 values in the range 3.3 - 220.4 µm. The results of this exercise are illustrative of the range of Particle Size Distributions found across whole copper compound industry and are therefore inclusive of copper sulphide from the large majority of sources.

To account for the possibility that materials with a smaller particle size may be produced for certain specialist uses, the Exposure Scenarios developed under REACH are based on the worst-case assumption that 100% of any material becoming airborne 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.

Due to the low water solubility of copper sulphide, it was not possible to determine the dissociation constant in water.

Viscosity

Not applicable.

Not applicable to solids.

Auto flammability

Copper sulphide has been determined to have a relative self-ignition temperature of 260 °C.