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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:
07-19 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:
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 13 and 14 October 2014/Signed on 8 April 2015
Type of method:
method according to Siwoloboff
Key result
Boiling pt.:
173.7 °C
Atm. press.:
>= 99 683 - <= 100 227 Pa
Decomposition:
yes
Decomp. temp.:
>= 140 °C

Findings:

Pre-test:

The following observations were noted:

Observations

Temperatures

Shrivelled together

Since 60 °C

The bottom part was melted to a slightly turbid yellow to red-brown mass

75 °C

Completely melted with lots of fine foam

82 °C

Colourless condensate visible

Since 130 °C

Foam slowly vanish

Since 140 °C

No foam anymore, individual bubble with large interval

Since 156 °C

Bubble chain, colour slightly darker, gas burner switched off

213 °C

Bubble chain broke

181.3 °C

After cooling down the test item was solidified as a brown clear solid.

Main test:

Observations

Temperatures

First

Determination

atmospheric pressure

99683 Pa

Second

Determination

atmospheric pressure

100227 Pa

Test start:

Test item melted immediately to a slightly turbid yellow/red -brown mass with lots of fine foam, the sample became a liquid.

120.0 °C

120.0 °C

Foam slowly vanish

Since 130 °C

Since 130 °C

Colourless condensate visible

Since 140 °C

Since 143 °C

No foam anymore, individual bubble with large interval

Since 150 °C

Since 146 °C

Boiling chain, colour slightly darker, gas burner switched off

193.2 °C

180.9 °C

Boiling chain broke

174.2 °C

173.1 °C

After cooling down the test item was solidified as a red-brown clear solid.

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

Results:

 

Boiling point

under decomposition

Pressure in Pa

First determination

174.2 °C (447.4 K)

99683 Pa

Second determination

173.1 °C (446.3 K)

100227 Pa

Mean

173.7°C (446.8 K)

 

Mean ± standard deviation (without correction following Sydney Young) = 173.7 ± 0.8 °C (446.8 ± 0.8 K).

Conclusions:
The determination of the boiling point of test item was performed following the Siwoloboff Method.
First sign of possibly decomposition indicated by a colourless condensate was observed since 140°C (lowest value).
Therefore the boiling point of test item should be stated as: 173.7 ± 0.8 °C (446.8 ± 0.8 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: 173.7 ± 0.8 °C (446.8 ± 0.8 K) under decomposition of the test item.

Description of key information

The boiling point of test item should be stated as: 173.7 ± 0.8 °C (446.8 ± 0.8 K) under decomposition of the test item. 

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

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
173.7 °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.