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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:
2018-03-27 to 2018-07-30
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling Point)
Version / remarks:
1995
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Version / remarks:
2008
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
dynamic method
Key result
Atm. press.:
1 007 hPa
Decomposition:
yes
Decomp. temp.:
ca. 220 °C
Remarks on result:
other: The test item has no boiling point up to the decomposition, starting at approx. 220 °C.

Results

In the temperature range of 220 - 250 °C, 250 - 280 °C and 290 - 320 °C three endothermic effects were observed. In the temperature range of 320 - 370 °C an exothermic effect was observed, with a decomposition energy of approx. -40 J/g.

Table 1: Results of the DSC-measurements

No.

Sample

Onset of Effect/ °C

Range of effect/ °C

Weight loss/ mg

Atmospheric presure/ hPa

PN15597

10.76

229.13

260.03

310.84

220 – 250 (endo)

250 – 280 (endo)

290 – 320 (endo)

320 – 360 (exo)

5.27

1007.4

PN15598

10.91

229.62

257.10

307.42

220 – 250 (endo)

250 – 280 (endo)

290 – 320 (endo)

320 – 370 (exo)

4.48

1007.4

During the heating phase three endothermic effects were observed, which can't be clearly assigned to a melting of the test item. Thus, the capillary method was performed for a verification of the DSC-measurements.

Three capillaries were filled with the test item up to a height of 4 - 6 mm. The capillaries were heated up from 30 to 200 °C with a constant heating rate of 10 K/min and from 200 to 400 °C with a constant heating rate of 10 K/min in the BÜCHI melting point apparatus. The test item was visually observed while increasing the temperature.

The melting of the test item could be observed at approx. 212 °C. The test item darkened at approx. 220 °C and its colour changed to black at approx. 280 °C. No boiling of the test item could be observed up to the decomposition of the test item.

Combining the results of the measurements, the first endothermic effect in the DSC in the temperature range of 220 to 250 °C can be assigned to a melting of the test item. As the onset temperatures in both tests do not deviate by more than 0.5 K from their mean value of 229.4 °C, the test item has a melting point of 229.4 °C under decomposition, which starts at approx. 220 °C.

No boiling of the test item could be observed up to the decomposition, starting at approx. 220 °C.

Conclusions:
The substance decomposes before boiling.
Executive summary:

The test item has no boiling point up to the decomposition, starting at approx. 220 °C at atmospheric pressure (1007 hPa) in an open aluminium crucible as determined by differential scanning calorimetry and confirmed by the capillary method according to Regulation EC No. 440/2008 Method A.2. and OECD Test Guideline 103 (1995).

Description of key information

The substance decomposes before boiling.

Key value for chemical safety assessment

Additional information

The test item has no boiling point up to the decomposition, starting at approx. 220 °C at atmospheric pressure (1007 hPa) in an open aluminium crucible as determined by differential scanning calorimetry and confirmed by the capillary method according to Regulation EC No. 440/2008 Method A.2. and OECD Test Guideline 103 (1995).