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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:
24 December 2018 - 28 February 2019
Reliability:
1 (reliable without restriction)
Qualifier:
equivalent or similar to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry
Specific details on test material used for the study:
Identification: 4,4'-(4-methylpentane-2,2-diyl)bis((heptyloxy)benzene)
Batch (Lot) Number: AS455433
Expiry date: 01 November 2020 (retest date) (taken from label)
Physical Description: Colourless to light yellow viscous liquid
Purity/Composition: 98.5%
Storage Conditions: At room temperature protected from light
Key result
Temp.:
ca. 20 °C
Vapour pressure:
0.002 Pa
Key result
Temp.:
ca. 25 °C
Vapour pressure:
0.004 Pa
Conclusions:
The isothermal TGA effusion method was applied for the determination of the vapour pressure of 4,4'-(4-methylpentane-2,2-diyl)bis((heptyloxy)benzene).
The vapour pressure of the test item at 20°C (293K) was <1.5 x 10^-3 Pa / < 1.1 x 10^-5 mm Hg
The vapour pressure of the test item at 25°C (298K) was < 4.1 x 10^-3 Pa / < 3.1 x 10^-5 mm Hg
Executive summary:

The vapour pressure of the test item (PT) was determined by the isothermal thermogravimetric effusion method. The method is validated in the range 10^-8 - 10^3 Pa using a set of five reference substances with known vapour pressures. The validity of the method was verified maximum one month before this study using hexachlorobenzene as reference control substance. Since the logarithm of the evaporation rate at 20°C (log vT, 20) deviated < 10% from the average value obtained during the validation test, it was possible to apply the constants obtained with the validation test for the determination of the vapour pressure of the test item.

The vapour pressure of the test item at 20°C (293K) was <1.5 x 10^-3 Pa / < 1.1 x 10^-5 mm Hg

The vapour pressure of the test item at 25°C (298K) was < 4.1 x 10^-3 Pa / < 3.1 x 10^-5 mm Hg

Description of key information

The isothermal TGA effusion method was applied for the determination of the vapour pressure of 4,4'-(4-methylpentane-2,2-diyl)bis((heptyloxy)benzene).

The vapour pressure of the test item at 20°C (293K) was <1.5 x 10^-3 Pa / < 1.1 x 10^-5 mm Hg

The vapour pressure of the test item at 25°C (298K) was < 4.1 x 10^-3 Pa / < 3.1 x 10^-5 mm Hg

Key value for chemical safety assessment

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

Additional information

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