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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
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
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)
GLP compliance:
no
Other quality assurance:
other: EN ISO 9001
Type of method:
other: differential scanning calorimetry
Specific details on test material used for the study:
- Name of test material (as cited in study report): Hydroxypropyl methacrylate
- Physical state: liquid
- Analytical purity: 99.08%
- Lot/batch No.: 1035102305
- Storage condition of test material: between room temperature and 4 °C
Remarks on result:
other: no melting point was detected

The DSC-curve shows no melting peak in the heating cycle, but a relaxation peak and an endothermic Cp-step at – 90 °C, characteristic for a glass transition, i.e. the test item solidifies amorphously in the glassy state.

Conclusions:
No melting point was detected for hydroxypropyl methacrylate. The DSC-curve shows no melting peak in the heating cycle, but a relaxation peak and an endothermic Cp-step at – 90 °C, characteristic for a glass transition, i.e. the test item solidifies amorphously in the glassy state.
Executive summary:

The melting point of hydroxypropyl methacrylate was determined acc. OECD 102 by DSC (differential scanning) method. No melting point was detected for hydroxypropyl methacrylate. The DSC-curve shows no melting peak in the heating cycle, but a relaxation peak and an endothermic Cp-step at – 90 °C, characteristic for a glass transition, i.e. the test item solidifies amorphously in the glassy state.

Description of key information

No melting point was detected for hydroxypropyl methacrylate in a test acc. OECD 102 by differential scanning method. The DSC-curve shows no melting peak in the heating cycle, but a relaxation peak and an endothermic Cp-step at – 90 °C, characteristic for a glass transition, i.e. the test item solidifies amorphously in the glassy state.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-90 °C

Additional information

MP ca. - 90 °C