Lead

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the melting point is above 300°C

Justification for type of information:

JUSTIFICATION FOR DATA WAIVING

Lead metal is stated to have a vapour pressure of 133 Pa at a temperature of 1000 °C. Based on a volatilisation enthalpy of ∆Hvap = 177.9 kJ/mol, this vapour pressure can be recalculated with the aid of the Clausius-Clapeyron equation to a vapour pressure of 8.2 * 10-7 Pa at the melting temperature of lead (326°C). Thus, it can safely be assumed that metallic lead will have a negligible vapour pressure at 20°C.

In accordance with REACH Annex VII, Section 7.5, Column 2, testing is not required.