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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:
07 March 2018 to 28 March 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling Point)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7220 (Boiling Point / Boiling Range)
Deviations:
no
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Key result
Decomposition:
yes
Decomp. temp.:
> 200 °C
Remarks on result:
other: boiling of the test item was not observed below the temperature at which reaction and/or decomposition started.

PRELIMINARY TEST

- The TGA curve of the test item is shown in Figure 1 (attached).

- Starting at 250°C, the weight of the sample decreased significantly.

- At 309 °C, the sample weight had decreased by 25%.

- After the experiment, a colourless residue remained in the sample container (original colour: colourless).

 

MAIN STUDY

- The DSC curve obtained with Experiment 1 is shown in Figure 2(attached). 

- During cooling,an exothermic peak between -25 °C and -10 °C was found (results are archived in the raw data). The effect was obtained due to crystallisation of the test item. 

- A glass transition was observed between -70 °C and -40 °C. During heating, a glass transition was observed between -75°C and -50°C. 

- The inflection point of the glass transition was -54.595 °C. Exothermic and endothermic peaks were observed between -50 °C and 25 °C directly followed by a broad endothermic effect between 25 °C and 100 °C. 

- The peak maximum of the endothermic peaks were -16.099 °C (first peak), -7.500 °C (second peak) and 9.328 °C (third peak). 

- The exothermic effects were due to crystallisation of the test item.

- The endothermic effects were due to melting of the test item. 

- The broad endothermic effect was due to evaporation of volatile components, based on the weight loss observed during the preliminary test. An endothermic peak was observed starting at 200°C. This endothermic effect was due to reaction and/or decomposition of the test item.

- Experiment 2 was performed to determine duplicate glass transition temperature and duplicate melting temperatures. Figure 3(attached) shows the DSC curve obtained. The inflection point of the glass transition was -55.349 °C. The peak maximum of the endothermic peaks were -16.277 °C (first peak), -7.693°C (second peak) and 8.923 °C (third peak). After the experiment, the sample appeared to have been unchanged, i.e. no decomposition and/or evaporation were observed. 

- The glass transition temperature was determined as the mean glass transition temperature of Experiment 1 (-54.595 °C) and Experiment 2 (-55.349 °C).

- The test item is a mixture. Three endothermic melting peaks were observed. Therefore, a melting range was given instead of a melting temperature. The melting range was determined with the melting temperatures obtained with Experiment 1 (-16.099°C, -7.500°C and 9.328°C) and Experiment 2 (-16.277 °C, -7.693 °C and 8.923 °C).

- Reaction and/or decomposition of the test itemwas observed during DSC experiments at temperatures of > 200°C (> 473K). Boiling of the test item was not observed below the temperature at which reaction and/or decomposition started. Based on this, the test item has no boiling temperature.

Conclusions:
Reaction and/or decomposition of the test item was observed during DSC experiments at temperatures of > 200 °C (> 473K). Boiling of the test item was not observed below the temperature at which reaction and/or decomposition started. Based on this, the test item has no boiling temperature.
Executive summary:

GUIDELINE

The investigation was conducted in accordance with OECD Guideline 103 Boiling Point (July 27 1995), EC Guideline A.2 Boiling Temperature (March 04, 2016) and EPA Product Properties Test Guideline OPPTS 830.7220: Boiling Point/Boiling Range (August 1996).

 

RESULTS

Reaction and/or decomposition of the test item was observed during DSC experiments at temperatures of > 200 °C (> 473K). Boiling of the test item was not observed below the temperature at which reaction and/or decomposition started. Based on this, the test item has no boiling temperature.

Description of key information

Reaction and/or decomposition of the test item was observed during DSC experiments at temperatures of > 200 °C (> 473K) (OECD 103, EU Method A.2 and OPPTS 830.7220).

Key value for chemical safety assessment

Additional information

GUIDELINE

The investigation was conducted in accordance with OECD Guideline 103 Boiling Point (July 27 1995), EC Guideline A.2 Boiling Temperature (March 04, 2016) and EPA Product Properties Test Guideline OPPTS 830.7220: Boiling Point/Boiling Range (August 1996).

 

RESULTS

Reaction and/or decomposition of the test item was observed during DSC experiments at temperatures of > 200 °C (> 473K). Boiling of the test item was not observed below the temperature at which reaction and/or decomposition started. Based on this, the test item has no boiling temperature.