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Vapour pressure

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Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
April - May 2008
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: vapour pressure balance
Specific details on test material used for the study:
- Description: pale yellow crystalline solid
- Batch number: 7X18A
- Storage conditions: approximately 4 °C in the dark over silica gel
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Key result
Transition / decomposition:
no
Remarks on result:
other: max. temperature tested was 140°C; far below the decomposition temp. of 210°C
Conclusions:
The vapour pressure of the test material has been determined to be 2.8 x 10 Exp.-6 Pa at 25°C.
Executive summary:

The study was performed according EU testing method A.4. The vapour pressure balance effusion method was chosen. The vapour pressure of the test item was determined above the melting range and was: at 25 °C: 2.8 × 10 Exp.-6 Pa (mean of six determinations).

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
March - May 2008
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
Pyromellitic dianhydride is not stable under certain conditions (e.g. in water). Therefore, a read-across is done to the corresponding decomposition product Pyromellitic acid for several endpoints. The present supporting test with PMA serves as bridging 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: vapour pressure balance
Specific details on test material used for the study:
- Description: white powder
- Batch number: 8M30N
- Storage conditions: room temperature in the dark upto 04 April 2008, thereafter at approximately 4 °C, over silica gel, in the dark
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Key result
Transition / decomposition:
no
Remarks on result:
other: max. temperature tested was 140°C; far below the decomposition temp. of 210°C
Conclusions:
The vapour pressure of the test material has been determined to be 6.3 x 10 Exp.-7 Pa at 25°C.
Executive summary:

The study was performed according EU testing method A.4. The vapour pressure balance effusion method was chosen. The vapour pressure of the test item was determined above the melting range and was: at 25 °C: 6.3 × 10 Exp.-7 Pa (mean of six determinations).

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
GLP compliance:
not specified
Temp.:
305 °C
Vapour pressure:
30 mm Hg
Conclusions:
The vapor pressure was determined to be 30 mm Hg at 305 °C.
Executive summary:

A study similar or equivalent to OECD Guideline 104 (Vapour Pressure Curve) revealed a vapor pressure of 30 mm Hg at 305 °C.

Description of key information

Pyromellitic dianhydride is not stable under certain conditions (e.g. in water). Therefore, a read-across is done to the corresponding decomposition product Pyromellitic acid for several endpoints. The present supporting test with PMA serves as bridging study.

Vapor pressure Pyromellitic dianhydride (PMDA)

The study was performed according EU testing method A.4. The vapour pressure balance effusion method was chosen. The vapour pressure of the test item was determined above the melting range and was: at 25 °C: 2.8 × 10 Exp.-6 Pa (mean of six determinations). In a supporting study similar or equivalent to OECD no. 104, the vapor pressure was found to be 30 mm Hg at 305°C.

Boiling point Pyromellitic acid (PMA / read-across)

The study was performed according EU testing method A.4. The vapour pressure balance effusion method was chosen. The vapour pressure of the test item was determined above the melting range and was: at 25 °C: 6.3 × 10 Exp.-7 Pa (mean of six determinations).

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
25 °C

Additional information

Source: GLP-report