Benzene-1,2:4,5-tetracarboxylic dianhydride

Boiling point

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

boiling point

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

Guideline:

OECD Guideline 103 (Boiling Point)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

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

Boiling pt.:

> 400 °C

Atm. press.:

100.91 kPa

Decomposition:

no

No boiling of the test item was observed up to the maximum temperature of 400°C. Two endothermic effects were observed:

- 225°C (499 K): loss of impurity/solvent:

- 287°C (561 K): melting of sample

Conclusions:

The test item has a boiling point of > 400°C under the conditions of this study.

Executive summary:

The study was performed accorrding to OECD no. 103 using the Differential Scanning Calorimetry method and performing two measurements.

No boiling of the test item was observed up to the maximum temperature of 400°C. Two endothermic effects were observed:

- 225°C (499 K): loss of impurity/solvent:

- 287°C (561 K): melting of sample

In conclusion, the boiling point was found to be > 400°C (673 K) (mean of two runs).

Reference 2

Endpoint:

boiling point

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

Guideline:

OECD Guideline 103 (Boiling Point)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

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

Boiling pt.:

> 400 °C

Atm. press.:

101.1 kPa

Decomposition:

no

As a significant residue remained on completion of each determination, it was confirmed that the boiling point of the test material was greater than 400°C (>673 K). It was noted that the melting point of the test material was lower than that determined during the definitive melting point test. Possibly the degree of conversion to the anhydride was reduced at the higher heating rate used for this test, since the exposure time to elevated temperatures was reduced.

Conclusions:

The test item has a boiling point of > 400°C under the conditions of this study.

Executive summary:

The study was performed accorrding to OECD no. 103 using the Differential Scanning Calorimetry method and performing two measurements. No boiling of the test item was observed up to 400°C. In conclusion, the boiling point was found to be > 400°C (561 K) (mean of two runs).

Reference 3

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Deviations:

no

GLP compliance:

not specified

Boiling pt.:

397 - 400 °C

Atm. press.:

other: pressure not available

Decomposition:

no

Conclusions:

The boiling point was determined to be 397-400°C.

Executive summary:

A study similar or equivalent to OECD Guideline 103 (boiling point) revealed a vapor pressure of 397-400°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.

Boiling point Pyromellitic dianhydride (PMDA)

The study was performed accorrding to OECD no. 103 using the Differential Scanning Calorimetry method and performing two measurements.

No boiling of the test item was observed up to the maximum temperature of 400°C. Two endothermic effects were observed:

- 225°C (499 K): loss of impurity/solvent:

- 287°C (561 K): melting of sample

In conclusion, the boiling point was found to be > 400°C (673 K) (mean of two runs). In a supporting study similar or equivalent to OECD no. 103, the boiling point was determined to be 397-400°C.

Boiling point Pyromellitic acid (PMA / read-across)

The study was performed accorrding to OECD no. 103 using the Differential Scanning Calorimetry method and performing two measurements. No boiling of the test item was observed up to 400°C.In conclusion, the boiling point was found to be > 400°C (561 K) (mean of two runs).

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

400 °C

Additional information

Source: GLP-report