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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:
20.06. - 06.12.16
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling Point/Boiling Range)
Qualifier:
according to guideline
Guideline:
EU Method A.2 (Boiling Temperature)
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Boiling pt.:
> 240 - < 430 °C
Atm. press.:
1 013.3 hPa
Decomposition:
yes

One DSC measurement in an aluminium crucible with a hole showed an endothermal effect after the melting in the temperature range of 240 - 430 °C. No further endothermal or exothermal effects were observed up to the final temperature (500 °C). The mass loss after the DSC measurements amounted to 94 %.

 

Table 1: Boiling Point (DSC measurement).

Ident No.

Test item /mg

Starting temperature / °C

Final test temperature / °C

Temperature range (boiling) / °C

Onset / °C

Crucible

Observations after the measurement

35624

8.09

25

500

240 - 430

-

Aluminium with a hole

Slightly black test item discharged out of the crucible

 

A measurement with the capillary method was performed to clarify the results of the DSC measurements. Since this measurement was performed only as a verifying screening a high heating rate of 10 K/min was chosen and therefore the absolute temperature values derived with the capillary method are not as accurate as the DSC results. The filling height of the test item was approximately 5 mm.

 

Table 2: Results of the capillary method

No.

Set point/°C

Heating rate/ K/min

Endpoint/ °C

Remarks

1

220

10

410

(Test item is a white powder at ambient temperature)

Approx. 220 °C: test item appeared melted

Approx. 279 °C: beginning formation of bubbles

Approx. 310 °C: formation of bubbles continued, test item discoloured to yellow

Approx. 338 °C: increasing formation of bubbles, test item discoloured to amber

Approx. 372 °C: ongoing formation of bubbles, test item discoloured to dark orange

Approx. 401 °C: test item boiled

Approx. 410 °C: test item boiling ongoing, end of test, test item discoloured to dark brown

 

Under consideration of the results from the thermal stability, the DSC measurements and the capillary method it was concluded that the test item boiled under decomposition within a temperature range of 240 - 430 °C.

Conclusions:
The test item boiled under decomposition within a temperature range of 240 - 430°C under atmospheric conditions.
Executive summary:

A study was conducted according to OECD test guideline 103 and Regulation (EC) No 440/2008 method A.2 to determine the boiling point of the test item using differential scanning calorimetry. The test item and the reference are heated up from the starting temperature to the final temperature at a constant heating rate in a defined atmosphere (nitrogen). Open crucibles are used as containers for the test item and as empty reference crucible. The quantity of heat absorbed or released is measured and recorded.

Under consideration of the results from the thermal stability, the DSC measurements and the capillary method it was concluded that the test item boiled under decomposition within a temperature range of 240 - 430 °C.

Description of key information

A study was conducted according to OECD test guideline 103 and Regulation (EC) No 440/2008 method A.2 to determine the boiling point of the test item using differential scanning calorimetry. The test item and the reference are heated up from the starting temperature to the final temperature at a constant heating rate in a defined atmosphere (nitrogen). Open crucibles are used as containers for the test item and as empty reference crucible. The quantity of heat absorbed or released is measured and recorded.

Under consideration of the results from the thermal stability, the DSC measurements and the capillary method it was concluded that the test item boiled under decomposition within a temperature range of 240 - 430 °C.

Key value for chemical safety assessment

Additional information