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Physical & Chemical properties

Vapour pressure

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Description of key information

The vapour pressure is very low and equals 0.48 Pa at 20 °C (Data from Roempp Encyclopedia). At higher temperature close to melting point, the vapour pressure is raised (see discussion)

Key value for chemical safety assessment

Vapour pressure:
0.48 Pa
at the temperature of:
20 °C

Additional information

Other reported data are:

NTP (National Toxicology Program (NTP) of the U.S. Department of Health and Human Services; 0.27 mm Hg at 25 °C

U.S. Environmental Protection Agency Office of Pollution Prevention and Toxics, and Syracuse Research Corporation (SRC)

Vapour Pressure Estimations (25 °C)(Using BP: 203.85 °C (estimated) and using MP: 31.50 °C (exp database)):

VP: 0.282 mm Hg (Antoine Method) = 37.6 Pa (Antoine Method)

VP: 0.239 mm Hg (Modified Grain Method) = 31.8 Pa (Modified Grain Method)

VP: 0.384 mm Hg (Mackay Method) = 51.2 Pa (Mackay Method)

Selected VP: 0.239 mm Hg (Modified Grain Method) = 31.8 Pa (Modified Grain Method)

Subcooled liquid VP: 0.273 mm Hg (25 °C, Mod-Grain method) = 36.4 Pa (25 deg C, Mod-Grain method)