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Physical & Chemical properties

Vapour pressure

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Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
From 29 October 2015 to 30 November 2015
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:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: Knudsen cell
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 Pa
Remarks on result:
other: extrapolated result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0 Pa
Remarks on result:
other: extrapolated result

The vapour pressure was too low to be measured at 52°C (results for this temperature were excluded from calculations of final results), but good results were achieved from 91 to 115°C giving confidence in the extrapolated results.

Conclusions:
The vapour pressure was found to be 1.875E-8 Pa at 20°C and 3.685E-8 Pa at 25°C
Executive summary:

The vapour pressure of Chlorendic Acid was determined in accordance with OECD Testing Guideline 104 and EU Method A4 using the Knudsen cell effusion method. The vapour pressure was too low to be measured at 52°C (results for this temperature were excluded from calculations of final results), but good results were achieved from 91 to 115°C giving confidence in the extrapolated results. The vapour pressure was calculated to be 1.875E-8 Pa at 20°C and 3.685E-8 Pa at 25°C.

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
6 June to 3 July 2002
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study undertaken at GLP accredited laboratory.
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: vapour pressure balance
Temp.:
25 °C
Vapour pressure:
ca. 0.003 Pa
Transition / decomposition:
no

Three runs were performed between 27 and 79 C. The same sample was used for each tes, with the pressure being kept at less than 1*10 -5 Torr.

Conclusions:
The vapour pressure of chlorendic anhydride is 2.68 x 10 -3 Pa at 25°C.

Description of key information

Although the vapour pressure of chlorendic anhydride was measured as 2.68E-03 Pa at 25°C, chlorendic anhydride hydrolyses to chlorendic acid in the environment.  Therefore the vapour pressure of chlorendic acid (1.875E-8 Pa at 20°C) was used for the Chemical Safety Assessment.

Key value for chemical safety assessment

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

Additional information