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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:
2015-07-06
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
The study was conducted according to a relevant test method and in accordance with a recognised quality system
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
Qualifier:
according to guideline
Guideline:
EU Method A.2 (Boiling Temperature)
GLP compliance:
no
Other quality assurance:
other: ISO 9001:2008
Type of method:
photocell detection
Key result
Boiling pt.:
237.2 °C
Atm. press.:
1 013 hPa
Key result
Boiling pt.:
510.4 K
Atm. press.:
1 013 hPa

Results:

Photocell detection method:

The results from the photocell detection method is shown in Table 1 below.

Table 1: Results – photocell detection method

Test

Measured boiling temperature

Measured

atmospheric

pressure

Boiling temperature corrected to normal atmospheric pressure

°C

K

hPa

°C

K

1

235.5

508.7

969

237.5

510.7

2

234.8

508.0

969

236.8

510.0

Mean value

235.2

508.4

 

237.2

510.4

 

Approximate accuracy of the instrument: ± 0.3 K (at 373K)

DSC Measurement:

The DSC diagram (blue line) showed an endothermic peak which represents the boiling temperature. The simultaneous TG (green line) showed a significant loss of weight in the range of this peak. The uncorrected boiling temperature (peak onset at 235.8°C) of this measurement corresponds to the values of the capillary tube/photocell method very closely. The DSC/TG thermograms are attached.

Conclusions:
A boiling point value of 237.2°C (510.4K) at 1013 hPa was determined in a reliable study conducted according to a relevant test method and in compliance with a known quality system. The result is considered to be reliable.

Description of key information

Boiling point: 237.2°C (510.4 K) at 1013 hPa (OECD 103)

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
237.2 °C

Additional information

A measured boiling point value of 237.2°C (510.4 K) at 1013 hPa was determined for the substance using a photocell detection method in accordance with OECD 103 Test Guideline and in compliance with a known quality system (ISO 9001:2008). The result is considered to be reliable and is selected as key study. The key study is supported by a boiling point value of 236.1±1°C (509.3±1°K) at 98 kPa which was determined in a reliable study conducted according to the OECD test guideline and EU test method. The test was not conducted at standard atmospheric pressure.

In a secondary source to which reliability could not be assigned, a boiling point value of 180°C was reported for the substance.

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