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Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

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Link to relevant study record(s)

Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
November 2006 - February 2007
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
- Identity: Metaldehyde
- Chemical name: 2, 4 ,6,8-tetramethyl-1 ,3 ,5, 7-tetraoxacyclo-octane
- Appearance: White, crystalline powder
- Storage conditions: Ambient
- Expiry date: 10 July 2009
- Date received: 17 July 2006
Key result
Decomposition:
no
Sublimation:
yes
Subl. temp.:
191 °C

Metal block method:

In the duplicate definitive determinations, the samples went straight to Stage B of melting (as referenced in OECD Method 102) at a temperature of 191°C. The remaining stages of melting were not observed and it was noted that the samples had completely sublimed by temperatures of 201 and 197°C respectively. During the sublimation process it was noted that the test substance condensed above the heating zone of the apparatus.

Differential scanning calorimetry:

The results from the three DSC tests were identical. In each case a relatively sharp endotherm was observed at a peak maximum between 200 and 210°C. The extrapolated onset temperatures for the sharp endotherms for the tests were 182°C for the open crucible test and 185°C for the sealed crucible tests. In each case it was observed that the endotherms had started as broad features, with the onset

at approximately 100°C, which indicates the initiation of changes in the test substance at this temperature.

Conclusions:
No melting point could be observed. The test item was found to sublime at 191°C.
Executive summary:

A study was performed to determine the melting temperature the test item. The test was performed in accordance with EC method A.1 and OECD-method no. 102. The melting temperature was determined by the metal block method in which the sample was assessed in a sealed tube and also by differential scanning calorimetry. The test item was found to sublime at 191°C.

Description of key information

A study was performed to determine the melting temperature the test item. The test was performed in accordance with EC method A.1 and OECD-method no. 102. The melting temperature was determined by the metal block method in which the sample was assessed in a sealed tube and also by differential scanning calorimetry. The test item was found to sublime at 191°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
191 °C

Additional information

Source: GLP-report