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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:
19-20 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.
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to other study
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.:
202.5 °C
Atm. press.:
>= 99 734 - <= 99 760 Pa
Decomposition:
yes
Decomp. temp.:
>= 188 °C

Pre-test:

Observations

Temperatures

getting pale

Since 30 °C

Started to melt to a milky turbid mass

70 °C

Getting slowly clearer

Since 80 °C

Completely melted to a clear slightly yellow liquid

135 °C

One bubble

144 °C, 168 °C, 176 °C, 181 °C

Individual bubble

Since 185 °C

Lots of fine small bubbles, colour getting darker

Since 200 °C

Bubble chain, gas burner switched off

220 °C

Bubble chain broke

203.6 °C

After cooling down the test item was solidified as a slightly yellow-brown clear solid.Possibly decomposition was considered

Main test:

Observations

Temperatures

First

Determination

atmospheric pressure

99760 Pa

Second

Determination

atmospheric pressure

99734 Pa

Test start:

Test item melted immediately to a clear slightly yellow liquid with lots of fine small bubbles, bubbles getting vanish

185.0 °C

185.0 °C

Colourless condensate visible, colour getting darker

Since 188 °C

Since 188 °C

Lots of fine small bubbles

Since 201 °C

Since 197 °C

Boiling chain, gas burner switched off

216.1 °C

213.5 °C

Boiling chain broke

203.6 °C

201.3 °C

No calculation following Sydney-Young was carried out as decomposition (indicated by a colourless condensate and colour change) is considered.

Results:

 

Boiling point

under decomposition

Pressure in Pa

First determination

203.6 °C (476.8 K)

99760 Pa

Second determination

201.3 °C (474.5 K)

99734 Pa

Mean

202.5°C (475.6 K)

 

Mean ± standard deviation (without correction following Sydney Young) = 202.5 ± 1.6 °C (475.6 ± 1.6 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 and colour change were observed since 188°C.
Therefore the boiling point of test item should be stated as: 202.5 ± 1.6 °C (475.6 ± 1.6 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: 202.5 ± 1.6 °C (475.6 ± 1.6 K) under decomposition of the test item.

Description of key information

The boiling point of test item should be stated as: 202.5 ± 1.6 °C (475.6 ± 1.6 K) under decomposition of the test item.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
202.5 °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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