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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:
08-09 May 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
The study was conducted according to an internationally recognised method. Test substance is adequately characterised. Therefore full validation applies.
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling Point)
Version / remarks:
1995
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Version / remarks:
2008
Deviations:
no
Principles of method if other than guideline:
Not applicable
GLP compliance:
yes (incl. certificate)
Remarks:
Inspected on 15 and 16 November 2017/ Signed on 15 May 2018
Type of method:
method according to Siwoloboff
Key result
Boiling pt.:
254.3 °C
Atm. press.:
>= 98 919 - <= 99 018 Pa
Decomposition:
yes

Pre test boiling point:

When heating a sample of the test item in an open test tube (10*100 mm) with a gas burner individual bubble was observed at 258 °C and more bubbles were visible at 273 °C. At 294 °C super heating was occurred, the gas burner was turned off.

After cooling down the test item was slightly darker (dark brown).

Main test Siwoloboff method:

Observations and measured values are presented in the following table.

Table          Observations Main Test

Observations

First

Determination

Atmospheric pressure 99018 Pa

Second

Determination

Atmospheric pressure 98919 Pa

When the sample tube was set into the aluminium block, the condensate was visible

245.0 °C

245.0 °C

Individual bubble visible

Since 247°C

Since 247°C

The colour was slightly darker

Since 258°C

Since 258°C

Lots of small bubbles

Since 265°C

Since 265°C

Bubble chain, turned off gas burner, colour was pale brown

276.2 °C

274.5 °C

The chain broke

253.7 °C

254.8 °C

The test item stay pale brown instead of yellow (original colour) ,see photo

After cooling down

Since boiling under decomposition was observed, the result is stated without Sidney-Young correction.

The colour change during determination confirms the decomposition.

Therefore boiling point under decomposition of the test item should be stated as 254.3 ± 0.8 °C (527.4 ± 0.8 K).

Conclusions:
The determination of boiling point of the test item was determined with the Siwoloboff method. The test item had changed its colour to pale brown during the tests. Therefore, the boiling point should be stated as 254.3 ± 0.8 °C (corresponding to 527.4 ± 0.8 K) under decomposition. This value is the mean of two independent determinations. As the test item decomposed, a correction to standard pressure following Sidney-Young was not applied.
Executive summary:

The determination of boiling point of the test item was determined with the Siwoloboff method. The test item had changed its colour to pale brown during the tests. Therefore, the boiling point should be stated as 254.3 ± 0.8 °C (corresponding to 527.4 ± 0.8 K) under decomposition. This value is the mean of two independent determinations. As the test item decomposed, a correction to standard pressure following Sidney-Young was not applied.

Description of key information

The boiling point of test item should be stated as: 254.3 ± 0.8 °C (527.4 ± 0.8 K) under decomposition of the test item.

This value is the mean of two independent determinations without Sydney-Young correction.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
254.3 °C

Additional information

A fully reliable experimental study, conducted according to OECD 103/ EU A2 guideline is available.

It is considered as a key study, and the result is retained as key data.