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Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Between 3 October 1996 and 13 November 1996
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Version / remarks:
Commission Regulation (EC) No. 440/2008
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
differential scanning calorimetry
Remarks:
ASTM 537-86
Boiling pt.:
539 K
Atm. press.:
101.42 kPa
Decomposition:
yes
Remarks on result:
other: At the termination of each test, the appearance of the test material was a black tar-like residue.

Results

Thermograms and thermographic data for Determinations 1 and 2 are shown in the following tables

Thermographic Data-Determination 1

Thermal Event

 

Temperature

oC

oK

Minor compenent/impurity endotherm

Onset of exothermic decomposition of test material

Boiling endotherm of test material

227

267

289

500

540

562

 

Thermographic Data-Determination 2

Thermal Even

Temperature

oC

oK

 Minor compenent/impurity endotherm

Onset of exothermic decomposition of test material

Boiling endotherm of test material

225

265

285

498

539

559

 

Atmospheric pressure: 102.22 kPa

Mean melting temperature: 312±0.5K

Meanboilingand/ordecompositiontemperature:655±0.5K

 

Discussion

The determinations were performed under nitrogen atmospheres. This was to ensure that if any decomposition was observed, this was probably thermal and not oxidative.

To aid in DSC interpretation a visual assessment was performed using metal block apparatus. The test material was observed to bubble from approximately 220°C. The test material was observed to change to a light brown colour from approximately 280°C. This bubbling and colour change was indicative of boiling with decomposition.

 

Conclusions:
The test material decomposed from approximately 539 +/- 0.5K prior to boiling (101.49kPa).
Executive summary:

Method

The determination was carried out in a GLP-compliant study by differential scanning calorimetry (DSC) using the procedure specified in ASTM E537-86, Methods A.2 of Commission Directive 92/69/EEC (which constitutes Annex V of Council Directive 67/548/EEC).

 

Results

The test material decomposed from approximately 539 +/- 0.5K prior to boiling (101.42kPa).

 

Description of key information

The test material decomposed from approximately 539 ± 0.5 K prior to boiling (101.42kPa) (EU Method A.2).

Key value for chemical safety assessment

Additional information

Method

The determination was carried out in a GLP-compliant study by differential scanning calorimetry (DSC) using the procedure specified in ASTM E537-86, Methods A.2 of Commission Directive 92/69/EEC (which constitutes Annex V of Council Directive 67/548/EEC).

 

Results

The test material decomposed from approximately 539 +/- 0.5K prior to boiling (101.42kPa).