Registration Dossier
Registration Dossier
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EC number: 220-585-8 | CAS number: 2825-82-3
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- no data
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study
- Remarks:
- Procedure and sample identification are described with sufficient details.
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- GLP compliance:
- no
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- 183.2 K
- Melting / freezing pt.:
- -90 °C
- Conclusions:
- The melting point of exo-THDCPD was determined as 183.2 K (-90.0°C).
- Executive summary:
The publication describes the determination of thermodynamical properties, including melting temperature, of the substance, using Differential Scanning Calorimetry. The procedure is equivalent to the OECD guideline. Measurements were performed in triplicate, under nitrogen.
The melting point of exo-THDCPD was determined as 183.2 K.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- 11-8-1976 to 11-7-1977
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- documentation insufficient for assessment
- Qualifier:
- no guideline followed
- GLP compliance:
- no
- Type of method:
- differential scanning calorimetry
- Melting / freezing pt.:
- 182.4 K
- Melting / freezing pt.:
- -90.8 °C
- Executive summary:
The melting point of exoTHDCPD was measured at 182.4K using the DSC.
Referenceopen allclose all
| Assay | T transition (K) | T fusion (K) |
| 1 | 162.1 | 183.3 |
| 2 | 162.2 | 183.1 |
| 3 | 162.1 | 183.2 |
| mean (+-/ SD) | 162.1 +/- 0.1 | 183.2 +/- 0.1 |
The exo isomer shows a low-temperature solid-to-solid transition at T = 162.1 K, and a melting temperature of 183.2 K.
Description of key information
The melting point of exoTHDCPD was measured as 183.2 K (= -90.0°C).
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- -90 °C
Additional information
Two publications were identified, providing consistent values. However, in Moynihan et al, insufficient experimental details are provided, while Chickos gives a fully reliable description of the determination, comparable to a guideline study. Therefore it is considered as key data.
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