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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:
2018-10-11 to 2018-11-20
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling Point)
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Boiling pt.:
ca. 360 °C
Atm. press.:
1 atm
Decomposition:
yes
Decomp. temp.:
ca. 340 °C

Two DSC measurements in aluminum crucibles with a hole showed at around 340 °C the beginning of an exothermal effect which turned into a multistage endothermal effect at 360 °C to 370 °C. This multistage endothermal effect continued to 470 °C. No further endothermic or exothermic effects were observed up to the final temperature (500 °C). The mass loss after DSC measurements amounted from 97% to 100%. After the measurements black residues were observed.

The results of the DSC measurements are summarized in Table 1 below.

Table 1: Boiling point (DSC measurement)

Measurement no.

Test item / mg

Starting temperature / °C

End temperature / °C

Temperature range (endothermal) / °C

Onset (boiling) / °C

Crucible

Observations after measurement

1

17.57

25

500

360 - 450

multistage

Al with a hole

crucible and crucible cap coloured into black;

mass loss: 100%

2

29.68

25

500

360 - 470

multistage

Al with a hole

crucible and crucible cap coloured into black;

mass loss: 97%

 

It is assumed, that during the DSC measurements the test item decomposed beginning at around 340 °C (exothermal effect). This assumption was supported by the observation of a black residue after the measurement. The multistage endothermal effects starting at around 360 °C were supposed to result from evaporation of the test item or of fragments of the decomposed test item.

Conclusions:
The test item boils under decomposition at around 360 °C.
Executive summary:

The boiling point of the test item was investigated by DSC measurement according to OECD 103. The test item starts to decompose at around 340 °C which is indicated by an exothermal effect. Subsequent endothermal effects starting at around 360 °C indicate evaporation of the test item and/or its decomposition products. To conclude, the test item boils under decomposition at around 360 °C.

Description of key information

The test item boils under decomposition at around 360 °C.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
360 °C

Additional information

The test item starts to decompose at around 340 °C which is indicated by an exothermal effect. Subsequent endothermal effects starting at around 360 °C indicate evaporation of the test item and/or its decomposition products.