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Physical & Chemical properties

Water solubility

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Description of key information

The water solubility of boron carbide has been determined by the flask method OECD 105 as 0.072mg/L at 20°C. This is an upper limit, as the test substance  as an impurity always contains soluble boron oxide (B2O3).

Key value for chemical safety assessment

Water solubility:
0.072 mg/L
at the temperature of:
20 °C

Additional information

Boron carbide (B4C) always contains as an impurity soluble diboron trioxide (B2O3), which stems from the production process (boric acid as starting raw material, see section 3.1). As the solubility of boron carbide calculated from boron concentration in water extracts is < 0.1mg/L, boron carbide can be considered as insoluble.