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Physical & Chemical properties

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:
From 11 September to 05 December, 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
adopted in 1995
Qualifier:
according to guideline
Guideline:
other: OECD Test Guideline 113: Thermal Stability
Version / remarks:
adopted in 1981
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Remarks:
and capillary method
Decomposition:
yes
Decomp. temp.:
250 °C

MELTING POINT - DSC method

The test item showed a broad endothermic effect starting at a temperature of 40 °C and an exothermic effect starting from 250 °C with an average energy release of -50 J/g.

During the heating phase one broad endothermic effect was detected, which cannot be clearly assigned to a melting of the test item.

Results of DSC analysis

No. Sample weight (mg) Onset of Effect (°C) Energy (J/g) Weight loss (mg) Atmospheric pressure (hPa)
PN14226 17.11 40 340 4.74 997.8
250 -20
PN14231 13.74 50 360 4.05 997.8
330 -80

MELTING POINT - capillary method

According to the observations during the tests with the capillary method, the broad endothermic effect starting at 40 °C in the DSC measurements with open crucibles cannot be assigned to the melting of the test item, since the test item did not change its appearance. Since the test item contains 2.5 % water, it can be assumed, that the endothermic effect is caused by the drying of the test item. Starting at a temperature of approx. 290 °C the test item becomes liquid and simultaneously blisters rise. Due to the fact that a sharp exothermic effect was observed in the DSC measurements starting at a temperature of approx. 250 °C, the effect can not be associated with a melting. It can be stated that the test item has no melting point up to its decomposition.

THERMAL STABILITY

The test item showed two exothermic effects starting from 90 °C and 220 °C, with an overall decomposition energy of approximately -80 J/g.

No. Sample weight (mg) Start of effect (°C) Energy (J/g)
PN14471 6.93 90 -30 (exothermic)
220 -60 (exothermic)
PN14472 7.37 100 -30 (exothermic)
220 -40 (exothermic)
Conclusions:
The substance decomposes before melting (250 °C).
Executive summary:

The thermal behaviour of test item was assessed using the DSC analysis, according to the OECD guideline 102 and OECD guideline 113. To verify the results of the DSC measurement, three additional measurements with the capillary method were performed in the temperature range of 25 – 300 °C with a heating rate of 10 K/min.

The test item has no melting point up to its decomposition starting at a temperature of approx. 250 °C as determined by differential scanning calorimetry and capillary method.

In the DSC-measurements the test item showed two small exothermic effects starting from 90 °C and 220 °C, with an overall decomposition energy of approximately -80 J/g.

Conclusion

The substance decomposes before melting (250 °C).

Description of key information

The substance decomposes before melting (250 °C).

Key value for chemical safety assessment

Additional information

OECD 102 and OECD 113 - DSC analysis and capillary method