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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:
2006-04-27 - 2006-11-03
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
Qualifier:
according to guideline
Guideline:
other: EN ISO 11357-3 (Plastics-Differential scanning Calorimetry- Part 3 Determination of Temperature and enthalpy of melting and crystallization)
Deviations:
no
GLP compliance:
no
Other quality assurance:
other: ISO 9001
Type of method:
thermal analysis
Specific details on test material used for the study:
- Name of test material (as cited in study report): 2-Hydroxyethyl methacrylate
- Physical state: liquid
- Analytical purity: 98.87%
- Lot/batch No.: 1035092208
- Stability under test conditions: stable
- Storage condition of test material: between room temperature and 4 °C
Remarks on result:
other: No melting point was detected but an endothermic Cp-step at -99 °C, characteristic for a glass transition, that means the test item solidifies amorphously.

The DSC-curve shows no melting peak, but an endothermic Cp-step at -99 °C, characteristic for a glass transition, that means the test item solidifies amorphously. An endothermic peak at 215 °C with an extrapolated onset temperature of 213 °C at atmospheric pressure indicates the boiling point.

Conclusions:
No melting point was detected. The DSC-curve shows no melting peak, but an endothermic Cp-step at -99 °C, characteristic for a glass transition, that means the test item solidifies amorphously. An endothermic peak at 215 °C with an
extrapolated onset temperature of 213 °C at atmospheric pressure indicates the boiling point.
Executive summary:

The melting point of 2-Hydroxyethyl methacrylate was tested acc. OECD 102 by DSC method. No melting point was detected.  The DSC-curve shows no melting peak, but an endothermic Cp-step at -99 °C, characteristic for a glass transition, that means the test item solidifies amorphously. An endothermic peak at 215 °C with an extrapolated onset temperature of 213 °C at atmospheric pressure indicates the boiling point.

Description of key information

The melting point of HEMA is -99 °C at 1013 hPa (OECD Guideline 102/EU Method A.1; differential scanning calorimetry).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-99 °C

Additional information