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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2002
Reliability:
2 (reliable with restrictions)

Data source

Reference
Reference Type:
review article or handbook
Title:
Unnamed
Year:
2002

Materials and methods

Principles of method if other than guideline:
Experimental measurement (data is taken from a reliable published summary report, information about the methodology is not available).
GLP compliance:
no
Type of method:
other:

Test material

Constituent 1
Reference substance name:
propylene oxide
IUPAC Name:
propylene oxide
Constituent 2
Reference substance name:
Methyloxirane
EC Number:
200-879-2
EC Name:
Methyloxirane
Cas Number:
75-56-9
IUPAC Name:
2-methyloxirane
Details on test material:
Test material was racemate from both R(+) and S(-) propylene oxide. This endpoint is not measured / determined with enantio-selective sensors.
Therefore the R(+) value is identical to the racemate endpoint.

Results and discussion

Vapour pressure
Temp.:
20 °C
Vapour pressure:
> 58.4 - < 61.2 kPa

Any other information on results incl. tables

The vapour concentration could only be estimated at the flash point temperature since the vapour pressure was only reported to -24.17°C and the Antoine constants calculated by McDonald et al. (1959) were only valid to -20°C. Therefore, it was not possible to validate the lower explosive limit or flash point in this way.

Applicant's summary and conclusion

Conclusions:
Several reliable measured vapour pressures are reported giving values in the range of 55 - 70 kPa between 19 and 25°C. The true value of the vapour pressure is probably between 58.4 and 61.2 kPa at 20°C. The middle of this range, 59.8 kPa, shall be used for exposure assessment.