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Physical & Chemical properties

Vapour pressure

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Description of key information

Vapour pressure: 0.0217 hPa at 20 °C,
0.0405 hPa at 25 °C.

Key value for chemical safety assessment

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

Additional information

The study performed in experimental laboratory with GLP standards (Paulus, 2009, LAUS) dedicated to estimate the vapour pressure of the test material 3 -mercaptopropionic acid has been chosen as a key study. The vapour pressure has been determined (0.0217 hPa at 20 °C and 0.0405 hPa at 25 °C) by using of the effusion method (weight loss) according to current guidelines: method OECD 104 resp. EU A.4.

The study (Rampy, 1973, Dow) was not performed according to current standards, vapour pressure was calculated by extrapolation of data from temperature range 130 -140°C to 25 °C , while in the key study the vapour pressure is determined by interpolation. Therefore the later study presents more reliable result. Two studies (Rampy, 1973, Dow) and (Daubert and Danner, 1989) support the key study.