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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:
from 2016-01-06 to 2016-04-19
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:
no
Type of method:
differential scanning calorimetry
Key result
Boiling pt.:
362.3 °C
Atm. press.:
1 013.3 hPa
Decomposition:
no

Two DSC measurements in aluminium crucibles with a hole showed an endothermal effect after the melting in the temperature range of 340 - 380 °C. The onset temperature was derived from the intersection of the tangent line with the highest slope of the endothermal peak with the baseline. No further endothermic or exothermic effects were observed up to the final temperature (500 °C).The mass loss after the DSC measurements amounted to 100 %.

 

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

35394

14.81

25

500

340 – 380

361.17

Aluminium with a hole

Mass loss 100 %

35395

13.56

25

500

340 - 380

361.20

Aluminium with a hole

Mass loss 100 %

 

The boiling point was corrected to the standard atmospheric pressure (1013.3 hPa) according to H.B. Hass and R.F. newton in “CRC Handbook of Chemistry and Physics, 74th ed. 1993-1994”. The test item was classified in group 2 (hydrocarbons) for the estimation of the respectful parameters.

Δt = (273.15 + t) * (3.0057 – logp) /Φ+ 0.15 * (3.0057 – logp)

t – temperature in °C

p – pressure in hPa

 

Table 2. Correction of the boiling point to standard atmospheric pressure

Ident No.

Onset / °C

Ambient pressure / hPa

Φ (Group 2)

Δt / °C

Boiling point at 1013.3 hPa / °C

35394

361.17

992.7

5.286

1.07

362.24

35395

361.20

992.8

5.286

1.06

362.26

 

The test item had a mean boiling point at atmospheric pressure (1013.3 hPa) of 362.3 °C.

Conclusions:
The test item has a mean boiling point at atmospheric pressure (1013.3 hPa) of 362.3 °C.
Executive summary:

A study was conducted according to OECD TG 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 was weighed out into an aluminium crucible under an inert atmosphere (nitrogen). Two tests with about 14 – 15 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. Two DSC measurements in aluminium crucibles with a hole showed an endothermal effect after the melting in the temperature range of 340 - 380 °C. The onset temperature was derived from the intersection of the tangent line with the highest slope of the endothermal peak with the baseline. No further endothermic or exothermic effects were observed up to the final temperature (500 °C). The mass loss after the DSC measurements amounted to 100 %. The correction of the boiling temperature to standard pressure was performed according to H.N. Hass and R.F. Newton. The test item boiling point was determined to be 362.3 °C at 1013.3 hPa.

Description of key information

The test item has a mean boiling point at atmospheric pressure (1013.3 hPa) of 362.3 °C.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
362.3 °C

Additional information

A study was conducted according to OECD TG 103 and Regulation (EC) No 440/2008 method A.2 to determine the boiling point of the test item using differential scanning calorimetry (reference 4.3-1). The test item was weighed out into an aluminium crucible under an inert atmosphere (nitrogen). Two tests with about 14 – 15 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. Two DSC measurements in aluminium crucibles with a hole showed an endothermal effect after the melting in the temperature range of 340 - 380 °C. The onset temperature was derived from the intersection of the tangent line with the highest slope of the endothermal peak with the baseline. No further endothermic or exothermic effects were observed up to the final temperature (500 °C). The mass loss after the DSC measurements amounted to 100 %. The correction of the boiling temperature to standard pressure was performed according to H.N. Hass and R.F. Newton. The test item boiling point was determined to be 362.3 °C at 1013.3 hPa.