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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
GLP compliance:
yes (incl. QA statement)
Type of method:
static method
Specific details on test material used for the study:
Dried and ground before testing
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
12.89 Pa
Test no.:
#2
Remarks on result:
other: Invalid test
Remarks:
As test runs 1 and 3 were in agreement it is suspected that the degassing period for run 2 was insufficient and is considered invalid.
Key result
Test no.:
#3
Temp.:
20 °C
Vapour pressure:
13.79 Pa

Comment

Run 1: 9.88 g of powder used in the analysis. The total degassing time was approximately 85 hours. The vacuum at the start of analysis was 0.0029 mbar.

Run 2: 11.22 g of sample was used in the analysis. The total degassing time was approximately 21 hours. The vacuum at start of analysis was 0.0032mbar. Due to the variance in results between run 1 and 2 (23.5 Pa at 20°C) a third test run was performed.

Run 3: 10.60 g of sample was used in the analysis. The total degassing time was approximately 41 hours. The vacuum at start of analysis was 0.0023mbar.

As test runs 1 and 3 were in agreement it is suspected that the degassing period for run 2 was insufficient and is considered invalid.

Conclusions:
13.3 Pa at 20°C (mean of runs 1 & 3)

Description of key information

13.3 Pa at 20°C (mean of runs 1 & 3)

Key value for chemical safety assessment

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

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