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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:

16 March 2020 - 14 July 2020

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Version / remarks:

30 May 2008

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Version / remarks:

27 July 1995

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Key result

Atm. press.:

101 kPa

Decomposition:

yes

Decomp. temp.:

ca. 194 °C

Remarks on result:

other: As the test item decomposed, no value for boiling temperature could be determined

The thermograms and thermographic data for Determinations 1 and 2 are shown in the attached figures and following table:

 

Table 3 - Thermographic data

Thermal Event	Interpretation	Temperature
		Determination 1	Determination 2
Endotherm	Initial gradual onset of decomposition	208.89	194.24
	Extrapolated decomposition	355.41	354.10

 

Atmospheric pressure: 101 kPa

After heating to 400 °C, the samples had lost approximately 88% and 93% of their original weight for Determinations 1 and 2 respectively.

Overall result:  decomposition from approximately 194 °C (467 K)

 

 

Discussion

Similar informational runs were also performed but which were terminated at 320 °C and 380 °C to observe their residues.  After being heated the 380 °C the residue was a black viscous liquid (51% loss of original weight).  This demonstrated the test item was significantly decomposed prior to the peak temperature of the main endotherm.  After being heated to 320 °C the residue was a dark brown viscous liquid (11% loss of original weight).  

This indicated that decomposition was occurring prior to 320 °C because the test item was originally light amber in colour.  Decomposition then continued to occur up to 380 °C and beyond this to 400 °C.

 

The main endotherm in the thermograms was considered to be volatilisation of components due to decomposition of the test item, rather than actual boiling of the test item.  Although the main endotherm had an easily defined extrapolated onset temperature of 355 °C, the endotherm did have a shallow rate of enthalpy change initially meaning its onset temperature could only be approximated.  Decomposition was taken to start from approximately 194 °C.

 

There was also a smaller endotherm at approximately 310 °C.  It was not known if this was part of the volatilisation of decomposition products or the boiling of a specific component that hadn’t decomposed.  However, it was considered not to form a significant composition of the test item.  

Conclusions:

The test item has been determined to decompose from approximately 194 °C (467 K) at 101 kPa. As the test item decomposed, no value for boiling temperature could be determined.

Executive summary:

Boiling Temperature.  Decomposed from approximately 194 °C (467 K), at 101 kPa, by differential scanning calorimetry, designed to be compatible with Method A.2 Boiling Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 103 of the OECD Guidelines for Testing of Chemicals, 27 July 1995. Study conducted under GLP conditions.

 

As the test item decomposed, no value for boiling point could be determined.

Description of key information

The test item has been determined to decompose from approximately 194 °C (467 K) at 101 kPa. As the test item decomposed, no value for boiling temperature could be determined.

Key value for chemical safety assessment

Temperature of decomposition (state purity):

194 °C

Additional information

Boiling Temperature.  Decomposed from approximately 194 °C (467 K), at 101 kPa, by differential scanning calorimetry, designed to be compatible with Method A.2 Boiling Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 103 of the OECD Guidelines for Testing of Chemicals, 27 July 1995. Study conducted under GLP conditions.

 

As the test item decomposed, no value for boiling point could be determined.