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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:
2007-03-19 to 2007-06-20
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
EEC Publication no. L383, December 29, 1992
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
July 27, 1995
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
differential scanning calorimetry
Decomp. temp.:
>= 150 °C
Remarks on result:
not determinable

Preliminary test

From the start until approximately 150°C the weight of the sample slightly decreased. From approximately 150°C upwards the weight of the sampie significantly decreased. At 234°C, the sampie weight had decreased by 25%. After the experiment, a dark brown coloured (original colour: orange - light brown) residue remained in the sampie pan. The change of the colour of the test substance indicates reaction and/or decomposition.

Main study

During cooling, a glass transition was observed between -10°C and -50°C. During heating, a glass transition was observed between -50°C and -15°C, with an extrapolated onset temperature of -28°C in the first experiment and -29°C in the second experiment. Above approximately 150°C reaction and/or decomposition of the test substance was observed. After the experiment, a sticky, yellowish coloured liquid remained in the sample container.

Besides a glass transition between -50°C (223 K) and -15°C (258 K) with an extrapolated onset of -29°C (244 K), no melting and/or boiling was observed below the temperature of 150°C (423 K) at which reaction and/or decomposition of the test substance started. Therefore, the test substance has no melting and/or boiling temperature.

Conclusions:
No melting point was found.
Executive summary:

The melting point of Amphopropionate C8 was determined according to OECD Guideline 102 (27 July 1995) and EU Method A.1 (29 December 1992) using differential scanning calorimetry.

Besides a glass transition between -50°C (223 K) and -15°C (273 K) with an extrapolated onset of -29°C (244 K), no melting was observed below the temperature of 150°C (423 K) at which reaction and/or decomposition of the test substance started. Therefore, the test substance has no melting temperature.

Description of key information

No melting point was found below decomposition temperature of 150°C (423 K) (OECD TG 102 / EU Method A.1; differential scanning calorimetry) ; RL1; GLP

Key value for chemical safety assessment

Additional information

Besides a glass transition between -50°C (223 K) and -15°C (273 K) with an extrapolated onset of -29°C (244 K), no melting was observed below the temperature of 150°C (423 K) at which reaction and/or decomposition of the test substance started. Therefore, the test substance has no melting temperature.