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Vapour pressure

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Description of key information

The vapour pressure of the test item was measured acc. to OECD 104. In addition to that the vapour pressures of the C-chain pure substances C20- and C22-trimethylammonium chloride were calculated from the molecular structure with commercially available software.

Key value for chemical safety assessment

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

Additional information

In a well conducted non-glp guideline study the vapour pressure was determined. The results are presented in the table below.

The vapour pressure was extrapolated :

T in °C

p in hPa

p in Pa


7.0× 10-7

7.0× 10-5


9.9× 10-7

9.9× 10-5


4.8× 10-6

4.8× 10-4

These findings are in good agreement with the results achieved by calculation. The vapour pressures for the C-chain pure materials with C20 and C22 at 20°C < 0.001 Pa.

Thus, for regulatory purposes the vapour pressure of < 0.001 Pa can be used as a default value