Registration Dossier
Registration Dossier
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EC number: 273-574-5 | CAS number: 68990-02-3
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Remarks:
- Glass Transition (Tg) temperature range of substance
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- November 2017 - December 2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Justification for type of information:
- The initial purpose was to determine the melting point of substance as required by annex VII of the REACH regulation. Since the substance is an amorphous solid at normal temperature and pressure, melting point cannot be determined. Instead of a melting point, the purpose of the study was to determine the Glass Transition (Tg) temperature range of substance.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- no
- Principles of method if other than guideline:
- “Tg” is actually a temperature range, rather than a specific temperature. The convention, however, is to report a single temperature defined as the midpoint of the temperature range, bounded by the tangents to the two flat regions of the heat flow curve.
- GLP compliance:
- not specified
- Other quality assurance:
- other: Statement of compliance included
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- ca. 42 °C
- Atm. press.:
- 1 023 hPa
- Remarks on result:
- other: Glass transition
- Conclusions:
- A glass transition was observed at around 42°C.
- Executive summary:
The determination of the glass transition temperature range was performed in accordance with OECD Guideline No 102 “Melting Point/Melting range” (July 1995). The Differential Scanning Calorimetry (DSC) method was used. A glass transition was observed at around 42°C.
Reference
Tg is actually a temperature range, rather than a specific temperature. The convention, however, is to report a single temperature defined as the midpoint of the temperature range, bounded by the tangents to the two flat regions of the heat flow curve. The glass transition measured is at around 42°C.
Description of key information
A glass transition was observed at around 42°C.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 42 °C
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
