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Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1999-01-07 to 1999-03-02

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling point/boiling range)

Version / remarks:

ASTM E537-86

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Version / remarks:

ASTM E537-86

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Key result

Boiling pt.:

206 °C

Atm. press.:

ca. 1 000.2 - ca. 1 017 hPa

Remarks on result:

other: Measured boiling point = 206 ± 1°C

Key result

Boiling pt.:

479 K

Atm. press.:

ca. 1 000.2 - ca. 1 017 hPa

Remarks on result:

other: Measured boiling point = 479±1 K

Key result

Decomposition:

yes

Remarks on result:

other: In the DSC thermogram using air atmosphere; the test substance was observed to undergo decomposition from about 171°C.

The results of the measurements are shown below:

Table 2: Determination 1 using air atmosphere

 

Thermal event	Interpretation	temperature
		°C	K
Onset of exotherm (followed by endotherm)	Start of decomposition (followed by boiling of test material and/or decomposition products)	Approximately 171.3	Approximately 444

Atmospheric pressure: 100.39 kPa

Table 3: Determinations 2 and 3 using nitrogen atmosphere

 

Thermal event	Interpretation	Determination	temperature
			°C	K
Endotherm (shallow)	Boiling temperature (approximate)	2   3	206.5   204.4	480   478

 

Atmospheric pressure: 100.02 – 101.70 kPa

Mean boiling temperature (approximate): 479±1 K

The DSC thermograms are shown in Figure 1 and Figure 2 attached.

Estimation of boiling point from vapour pressure result:

The boiling temperature was also estimated from vapour pressure data. The vapour pressure data was obtained using an isoteniscope method. An estimated boiling point of 492 K (219°C) at 101.325 kPa was obtained using Clausius-Clapeyron relationship.

Conclusions:

A boiling temperature value of 206 ± 1°C (479±1 K) at 1000.2 - 1017 hPa was determined for the substance using a relevant test method and in compliance with GLP. The result is considered to be reliable.

Description of key information

Boiling point: 206±1°C (479±1 K) at 1000.2 - 1017 hPa (ASTM E537-86)

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

206 °C

Additional information

A boiling point value of 206±1°C (479±1 K) at 1000.2 - 1017 hPa was determined for the substance using Differential Scanning Calorimetry (DSC) in accordance to a relevant test method and in compliance with GLP. The stated boiling temperature was obtained using a nitrogen atmosphere. However, when an air atmosphere was used, decomposition of the substance was observed from approximately 171°C. The result is considered to be reliable.