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Physical & Chemical properties

Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1996-12-04 to 1997-02-20
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
The study was conducted in accordance to an appropriate OECD test guideline with acceptable restriction. The restrictions were: unexplained early bubbling observed during the study and a lack of boiling in one replicate sample.
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
Deviations:
not specified
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
not specified
GLP compliance:
yes
Type of method:
photocell detection
Key result
Boiling pt.:
227 °C
Atm. press.:
101.3 kPa
Decomposition:
ambiguous
Remarks:
States irregular bubbling observed long before actual boiling temperature. However, the boiling point is measured when the frequency of bubbling is constant one per second. But, one of three runs showed no boiling at all.
Key result
Boiling pt.:
500 K
Atm. press.:
1 013 hPa
Decomposition:
ambiguous
Remarks:
States irregular bubbling observed long before actual boiling temperature. However, the boiling point is measured when the frequency of bubbling is constant one per second. But, one of three runs showed no boiling at all.

 The results of the measurements are summarised in the table below

Test no.

Atmospheric pressure

[kPa]

Boiling temperature

[oC / K]

Boiling point

[oC / K]

1

98.5

225.5 / 498.7

226.7 / 499.9

2

98.5

No boiling detected

No boiling detected

3

98.5

225.7 / 498.9

227.0 / 500.2

 

 

Mean value

227 / 500

 

The mean boiling point of the test substance (at 101.3 kPa) was 500 K = 227oC

Conclusions:
A boiling point value of 227°C at 1013 hPa was determined in a reliable study conducted according to an appropriate test protocol. Restrictions of the study were: unexplained early bubbling observed during the study and a lack of boiling in one replicate sample.

Description of key information

Boiling point: 227°C at 1013 hPa (OECD 103)

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
227 °C

Additional information

A measured boiling point of 227°C at 1013 hPa was determined for the substance using a photocell detection method in accordance with OECD Test Guideline 103 and in compliance with GLP. Before the main study was conducted, the boiling point of the substance was obtained from extrapolation of the raw data from the vapour pressure study; a boiling point of 222°C was calculated for the substance. Although, during the study, an unexplained early bubbling and lack of boiling in one of the replicate sample was observed, the result is considered to be reliable and selected as key study.

The measured boiling point was supported by a predicted boiling point of 220°C at 1013 hPa which was obtained for the substance using a validated QSAR estimation method. In available secondary sources to which reliability could not be assigned, boiling point values of 246°C and 192°C were reported for the substance.