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Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2019-07-15 to 2019-07-19
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
<= 160 °C
Atm. press.:
1 013.25 hPa
Decomposition:
yes
Decomp. temp.:
150 °C

In the temperature range of 150 – 170 °C an exothermic effect was observed. Between 220 – 380 °C a second exothermic effect was detected.

 

Results of the DSC-measurements

 

No.

Sample weight / mg

Onset of Effect / °C

Range of effect / °C

Weight loss / mg

Atmospheric pressure / hPa

PN18079

12.55

--
--

150 – 170 (exo)
230 – 380 (exo)

10.62

1015

PN18080

12.54

--
--

150 – 170 (exo)
220 – 370 (exo)

10.03

1015

 

During the heating phase no endothermic effect was observed up to the test end temperature of 500 °C. The capillary method was performed in order to confirm that there is neither melting nor boiling. The test item turned from white to brown at a temperature of 150 °C. At 160 °C the test item was liquified.

Conclusions:
The test item decompose at 150 °C before melting.
Executive summary:

A study was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1 and EPA OCSPP test guideline 830.7200 to determine the melting point of the test item using differential scanning calorimetry. The test item was weighed out into an aluminium crucible under an inert atmosphere (nitrogen). Two tests with about 12 – 13 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. Under ambient conditions, the test item is solid. Therefore, the tests were started at ambient temperature. The temperature was then increased up to 500 °C at a constant heating rate of 10 K/min under air. During the heating phase no endothermic effect was observed up to the test end temperature of 500 °C. The capillary method was performed in order to confirm that there is no melting point. The test item turned from white to brown at a temperature of 150 °C. At 160 °C the test item was liquified. Therefore, it was concluded that the test item decompose before melting.

Description of key information

The test item decompose at 150 °C before melting (reference 4.2 -1).

Key value for chemical safety assessment

Additional information

A study was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1 and EPA OCSPP test guideline 830.7200 to determine the melting point of the test item using differential scanning calorimetry (reference 4.2 -1). The test item was weighed out into an aluminium crucible under an inert atmosphere (nitrogen). Two tests with about 12 – 13 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. Under ambient conditions, the test item is solid. Therefore, the tests were started at ambient temperature. The temperature was then increased up to 500 °C at a constant heating rate of 10 K/min under air. During the heating phase no endothermic effect was observed up to the test end temperature of 500 °C. The capillary method was performed in order to confirm that there is no melting point. The test item turned from white to brown at a temperature of 150 °C. At 160 °C the test item was liquified. Therefore, it was concluded that the test item decompose before melting.