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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:
2008-09-15 to 2008-10-02
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
Version / remarks:
1995-07-27
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.2 (Boiling Temperature)
Version / remarks:
EEC Directive 92/96, Annex V, Part A
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
method according to Siwoloboff
Key result
Atm. press.:
>= 999 - < 1 001 hPa
Decomposition:
yes
Decomp. temp.:
ca. 250 °C

When a temperature of 246 °C was reached, formation of bubbles was observed, but no bubble chain emerged (which could have been taken as sign of boiling). The test item deepened in colour with rising temperature. When the test item had turned wine red, the determination was stopped.

The determination was performed in duplicate.

All measured values and the corresponding observations are stated in the following table:

 

Measurement

Temperature

Atmospheric Pressure

Observations

First determination

246 °C (519K)

1001 hPa

first bubbles visible

250 °C (523 K)

deepening in colour

269 °C (542 K)

colour change to wine-red

Second determination

246 °C (519K)

999 hPa

first bubbles visible

250 °C (523 K)

deepening in colour

270 °C (543 K)

colour change to wine-red

Conclusions:
No boiling point could be determined experimentally because of decomposition of the test item beginning at approx. 250 °C at an atmospheric pressure ranging from 999 to 1001 hPa.
Executive summary:

The boiling point of the test item was determined according to OECD test guideline 103 and EU-Method A.2. For this purpose, the Siwoloboff method was used. The liquid test item was filled into a sample tube containing a capillary tube in such a manner that the sealed part of the capillary is lying below the surface of the test item. The sample tube was then set into the aluminium block. For the increase of the temperature, a temperature gradient of < 1 K/min was maintained. No boiling point could be determined experimentally because of decomposition of the test item beginning at approx. 250 °C. Decomposition was observed in two independent determinations: one at an atmospheric pressure of 999 hPa and the other at 1001 hPa.

Description of key information

Following EU method A.2, no boiling point could be determined experimentally, because decomposition of the test item starting at 250 °C.

Key value for chemical safety assessment

Additional information

The boiling point of the test item was determined according to OECD test guideline 103 and EU-Method A.2. For this purpose, the Siwoloboff method was used. The liquid test item was filled into a sample tube containing a capillary tube in such a manner that the sealed part of the capillary is lying below the surface of the test item. The sample tube was then set into the aluminium block. For the increase of the temperature, a temperature gradient of < 1 K/min was maintained. No boiling point could be determined experimentally because of decomposition of the test item beginning at approx. 250 °C. Decomposition was observed in two independent determinations: one at an atmospheric pressure of 999 hPa and the other at 1001 hPa.