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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:
2006-11-3
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study performed and documented equivalent to GLP standards. Study according to relevant guideline EN ISO 11357-3 and EEC-Directive 92/69 EEC, Part A., Methods for the determination of physico-chemical properties, A.1 "Melting temperature" ,EEC Publication No. L383, December 1992.
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
adopted 27th July 1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
EEC Publication No. L383, December 1992
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: EN ISO 11357-3 (Plastics-Differential scanning Calorimetry)
Version / remarks:
Part 3 Determination of temperature and anthalpy of melting and chrystallization
Deviations:
no
Principles of method if other than guideline:
Method: Differential Scanning Calorimetry
In a measurement with differential scanning calorimetry (DSC) a sample of the test item and a
reference material (identical crucible without the test item) are subjected to the same controlled
temperature program. The difference in the temperatures of the test item and the reference
material is the original measurement signal which is internally assigned to the heat flow rate. The
heat flux DSC belongs to the class of heat-exchanging calorimeters. A defined exchange of the
heat to be measured takes place via a thermal resistance. In contrast in the power compensation
DSC, the heat to be measured is compensated with electric energy, by increasing or decreasing
an adjustable heating power.
When the sample undergoes a transition involving a change in enthalpy, for example an
endothermic melting or boiling transition that change is indicated by a departure from the base line
of the heat flow record. The peak area is proportional to the change in enthalpy.
GLP compliance:
no
Other quality assurance:
other: Tests were carried out according to the requirements of EN ISO 9001
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: between room temperature and 4°C
Key result
Melting / freezing pt.:
-62 °C
Atm. press.:
1 028 hPa
Conclusions:
The melting temperature of the test item was determined by differential scanning calorimetry according to EN ISO 11357-3 (Plastics-Differential scanning Calometry- Part 3 Determination of Temperature and enthalpy of melting and crystallization) and EEC-Directive 92/69 EEC, Part A, Methods for the determination of physico-chemical properties, A. 1 ,,Melting temperature"", EEC Publication No. L383, December 1992.

An endothermic peak at -59 °C with an extrapolated onset temperature of -62 °C indicates the melting point.
Executive summary:

The melting temperature of the test item was determined by differential scanning calorimetry according to EN ISO 11357-3 (Plastics-Differential scanning Calometry- Part 3 Determination of Temperature and enthalpy of melting and crystallization) and  EEC-Directive 92/69 EEC, Part A, Methods for the determination of physico-chemical properties, A. 1 ,,Melting temperature"", EEC Publication No. L383, December 1992.

An endothermic peak at -59 °C with an extrapolated onset temperature of -62°C indicates the melting point.

The melting point was -62 °C.

NOTE: Any of data in this dataset are disseminated by the European Union on a right-to-know basis and this is not a publication in the same sense as a book or an article in a journal. The right of ownership in any part of this information is reserved by the data owner(s). The use of this information for any other, e.g. commercial purpose is strictly reserved to the data owners and those persons or legal entities having paid the respective access fee for the intended purpose.

Description of key information

The melting temperature of n-hexyl methacrylate was determined by differential scanning calorimetry according to EN ISO 11357-3 (Plastics-Differential scanning Calometry- Part 3 Determination of Temperature and enthalpy of melting and crystallization) and  EEC-Directive 92/69 EEC, Part A, Methods for the determination of physico-chemical properties, A. 1 ,,Melting temperature"", EEC Publication No. L383, December 1992. The melting point was reported to be -62 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-62 °C

Additional information

The melting point of n-hexyl metharcrylate is -62 °C.