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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:
07-14 February 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, and under GLP. The test substance is adequately characterised. Therefore full validation applies.
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling Point)
Version / remarks:
1995
Deviations:
no
Qualifier:
according to guideline
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. QA statement)
Remarks:
Inspected on 13 and 14 October 2014/ signed on 8 april 2015
Type of method:
method according to Siwoloboff
Key result
Boiling pt.:
193 °C
Atm. press.:
>= 99 340 - <= 99 872 Pa
Decomposition:
no

Findings:

Pre-test:

The test tube with test item was set into the aluminium block at 18.3 °C. The aluminium block was heated with gas burner.

The following observations were noted:

Observations

Temperatures

Shrivelled together and getting clearer

Since 50 °C

Completely melted to a yellow clear sticky mass with lots of fine foam

60 °C

Colourless condensate, foam slowly vanish

Since 120 °C

Some bubbles in large interval

Since 130 °C

Bubble chain, gas burner switched off, colour slightly darker

210 °C

Boiling chain broke

188.4 °C

After cooling down the test item appeared as a yellow-brown clear solid.

Main test:

Observations and measured values are presented in the following table:

Observations

Temperatures

First

Determination

atmospheric pressure

99340 Pa

Second

Determination

atmospheric pressure

99872 Pa

Test start:

Test item melted to a clear yellow viscous liquid with lots of fine foam.The foam vanishes slowly. Colourless condensate visible.

120.0 °C

No foam anymore.

Since 125 °C

Some bubbles in large interval

Since 150 °C

Since 129 °C

Boiling chain, gas burner switched off, colour slightly darker

225.9 °C

221 °C

Boiling chain broke

192.1 °C

193.9 °C

After cooling down the test item appeared as a yellow-brown clear solid.

No calculation following Sydney-Young was carried out as signs of decomposition (change of colour) were considered.

Results:

 

Boiling point

under decomposition

Pressure in Pa

First determination

192.1 °C (465.3 K)

99340 Pa

Second determination

193.9 °C (467.1 K)

99872 Pa

Mean

193.0 °C (466.2 K)

 

Mean ± standard deviation (without correction following Sydney Young)= 193.0 ± 1.3 °C (466.2 ± 1.3 K)

Conclusions:
The determination of the boiling point of test item was performed following the Siwoloboff Method.
First signs of possibly decomposition indicated by a colourless condensate were observed since 120°C.
Therefore the boiling point of test item should be stated as: 193.0 ± 1.3 °C (466.2 ± 1.3 K) under decomposition of the test item.
This value is the mean of two independent determinations without Sydney-Young correction.
Executive summary:

The study was performed in order to determine the boiling point of test item according to OECD 103, resp. EU A.2, guideline, using the Siwoloboff method.

The boiling point of test item should be stated as: 193.0 ± 1.3 °C (466.2 ± 1.3 K) under decomposition of the test item.

Description of key information

The boiling point of test item should be stated as: 193.0 ± 1.3 °C (466.2 ± 1.3 K) under decomposition of the test item.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
193 °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.

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