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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:
2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
equivalent or similar to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
no
Type of method:
dynamic method
Specific details on test material used for the study:
Name: 9-Octadecenoic acid (9Z)-, propyl ester
Product Description: Propyl oleate
CAS No.: 111-59-1
Physical state: pale yellow to yellow liquid at 20 °C
Batch No.: 37584
Re-certification date of batch: 08 March 2018
Purity: > 99 % (fatty acid propyl esters, max water content 0.3 % (w/w))
Free Fatty Acid, % Oleic: 0.1
Color, Gardner: 3
Iodine Value, cg I2/g 75
Cloud Point, degrees C 0
Saponification Number, mg KOH/g 177
Moisture, % 0,07
Stability: stable under test conditions
Storage condition of test material: Room temperature, protected from light
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
<= 0.021 Pa
Remarks on result:
other: calculation based on the lowest possible boiling temperature according to the definition in the OECD Guideline 104 (Grain-Watson estimation)
Key result
Test no.:
#2
Temp.:
50 °C
Vapour pressure:
<= 0.38 Pa
Remarks on result:
other: calculation based on the lowest possible boiling temperature according to the definition in the OECD Guideline 104 (Grain-Watson estimation)

Results

The test item has a vapour pressure of ≤ 2.1.2 x 10^-7 atm (≤ 2.1 x 10^-2 Pa; ≤ 2.1 x 10^-4 mbar) at 20 °C and of ≤ 3.8 x 10^-6 atm (≤ 3.8 x 10^-1 Pa; ≤ 3.8 x 10^-3 mbar) at 50 °C (the calculation is based on the lowest possible boiling temperature) according to the definition in the OECD Guideline 104 (Grain-Watson estimation).

The experimentally determined vapour pressure of the test item at 20 °C is not in the recommended range of 1 to 1000 mbar for DSC-measurements. Therefore an estimation procedure in accordance with the test method OECD Guideline 104 “OECD Guideline For The Testing Of Chemicals, adopted by the Council on 23rd March 2006, Vapour Pressure” ANNEX Estimation Method newest version (Robert S. Boethling, Donald Mackay, Handbook of Property Estimation Methods for Chemicals, Lewis Publishers, year of publication 2000, Cap. 3 - Vapour Pressure, Grain-Watson Method, p. 53 – 65) was used. This method is applied for vapour pressures between 10^3 to 10^-7 mbar.This deviates from the older version published in OECD Guideline 104. It was used due to the differentiation between solids and liquids, which results in a more precise estimate.

Conclusions:
The test item has a vapour pressure of ≤ 2.1 x 10^-7 atm (≤ 2.1 x 10^-2 Pa; ≤ 2.1 x 10^-4 mbar) at 20 °C and of ≤ 3.8 x 10^-6 atm (≤ 3.8 x 10^-1 Pa; ≤ 3.8 x 10^-3 mbar) at 50 °C (the calculation is based on the lowest possible boiling temperature) according to the definition in the OECD Guideline 104 (Grain-Watson estimation).
Executive summary:

The vapour pressure of the test item was determined in accordance with the test method OECD Guideline 104 “OECD Guideline For The Testing Of Chemicals, adopted by the Council on 23rd March 2006, Vapour Pressure” (similar to the test method A.4. "Vapour Pressure according to the Dynamic Method" as described in the Official Journal of the European Communities L383A). The test item has a vapour pressure of ≤ 2.1 x 10^-7 atm (≤ 2.1 x 10^-2 Pa; ≤ 2.1 x 10^-4 mbar) at 20 °C and of ≤ 3.8 x 10^-6 atm (≤ 3.8 x 10^-1 Pa; ≤ 3.8 x 10^-3 mbar) at 50 °C (the calculation is based on the lowest possible boiling temperature) according to the definition in the OECD Guideline 104 (Grain-Watson estimation).

Description of key information

The test item has a vapour pressure of ≤ 2.1 x 10^-7 atm (≤ 2.1 x 10^-2 Pa; ≤ 2.1 x 10^-4 mbar) at 20 °C and of ≤ 3.8 x 10^-6 atm (≤ 3.8 x 10^-1 Pa; ≤ 3.8 x 10^-3 mbar) at 50 °C (the calculation is based on the lowest possible boiling temperature) according to the definition in the OECD Guideline 104 (Grain-Watson estimation).

Key value for chemical safety assessment

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

Additional information