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Physical & Chemical properties

Vapour pressure

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Description of key information

Vapour pressure at 20 °C: < 0.0000000133 Pa (OECD 104/EU A.4; isothermal thermogravimetric effusion method)

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the substance 2-methyl-N-(4-sulfamoylphenyl) prop-2-enamide (SPM-N) was determined according to OECD Guideline 104 and EU Method A.4, using isothermal thermogravimetric effusion method.

The experimentally determined weight losses (temperature range 210 - 240 °C) leading to log vT values of the substance were plotted as a function of the reciprocal temperatures. The resulting linear regression curve was extrapolated to 20 °C and provided a value of -15.5 for the log vT,20 of the test substance.

When fitting this value in the reference substances regression curve, a vapour pressure of 2.33E-13 Pa = 1.75E-15 mm Hg was obtained for SPM-N. As this value was obtained by extrapolation of the regression curve, the vapour pressure of the test substance is reported as < 1.33E-8 Pa = < 1.00E-10 mm Hg (the vapour pressure of the reference substance with the lowest PT,20 value, i.e. benzo(ghi)perylene).