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Vapour pressure

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Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
9th-19th September, 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
23rd March, 2006
GLP compliance:
not specified
Type of method:
other: estimation using the Grain-Watson method
Specific details on test material used for the study:
Batch 7683104
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
<= 1.3 Pa
Test no.:
#2
Temp.:
50 °C
Vapour pressure:
<= 15 Pa

DSC plots are attached.

Conclusions:
The test item has an estimated vapour pressure of <= 1.3 Pa at 20 °C.
Executive summary:

The vapour pressure of the test item was determined in accordance with OECD TG 104. The experimentally-determined vapour pressure of the test item at 20°C was not in the recommended range of 1 to 1000 mbars for DSC measurements. Therefore an estimation procedure in accordance with OECD TG 104 was used (Grain-Watson method). This method is applied for vapour pressures between 10E03 to 10E-07 mbar. The estimated vapour pressure is <= 1.3 Pa at 20 °C and <= 15 Pa at 50 °C.

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
2017-06-13 - 2017-06-13
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
GLP compliance:
not specified
Type of method:
static method
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.45 Pa
Conclusions:
The vapour pressure was 0.45 Pa at 20 °C.
Executive summary:

The vapour pressure of the test item was measured according to EU Method A.4 (Static method). The vapour pressure was 0.45 Pa at 20 °C.

Description of key information

Based on a weight of evidence approach the test item has an estimated vapour pressure of 0.45 Pa at 20°C.

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the test item was determined in accordance with OECD TG 104. The experimentally determined vapour pressure of the test item at 20°C was not in the recommended range of 1 to 1000 mbar for DSC measurements. Therefore an estimation procedure in accordance with OECD TG 104 was used (Grain-Watson method). This method is applied for vapour pressures between 10E03 to 10E-07 mbar. The estimated vapour pressure is <= 1.3 Pa at 20 °C and <= 15 Pa at 50 °C.

A measured vapour pressure is available for Phosphoric acid, C4 and C12-14(even numbered) alkyl esters. Since this substance contains alkyl chain lengths that are generally lower than the substance itself, this measured result is considered to be more representative of the likely vapour pressure of the substance (and quite likely a worse-case) and is adopted for exposure assessment.