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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:
September 5-11, 1991
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Well conducted GLP study, according to Eu and OECD guidelines, purity mentioned.
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
September 1984
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
May 12, 1981
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
capillary method
Melting / freezing pt.:
134.8 °C
Atm. press.:
101 325 Pa
Decomp. temp.:
138.8 °C
Remarks on result:
other: the substance decomposes immediately after the melting process, mp is above the SADT.

None of the stages as outlined above were observed.

Observations

At approximately 383 K (110°C), the test substance consistency started to change.

The test substance melted at approximately 417 K (144°C). The test substance changed from a white solid into a yellow liquid.

With increasing temperature, the test substance colour changed gradually from yellow into orange/brown.

At 408.0 K (138.8°C), the test substance showed the formation of gas (formation of bubbles and foam, test substance raised in the tube). The test substance changed from a white solid into a yellow liquid.

After cooling, the test substance remained yellow.

RESULTS

The determination of the melting point/melting range of DI-(4-METHYLBENZOYL)-PEROXID (INTEROX-PMBP) was performed in duplicate, using an Electrothermal melting point apparatus.

The melting temperature of DI-(4-METHYLBENZOYL)-PEROXID (INTEROX-PMBP) was determined to be 408 K (134.8°C).

At this temperature, the test substance changed from a white solid into a yellow liquid. This change in colour indicates decomposition immediately after the melting process.

The yellow colour remained after cooling down.

In conclusion, the melting point of

DI-(4-METHYLBENZOYL)-PEROXID (INTEROX-PMBP) is 408.0 K (134.8°C).

DI-(4-METHYLBENZOYL)-PEROXID (INTEROX-PMBP) decomposes immediately after the melting process.

Conclusions:
The melting point of bis(4-methylbenzoyl)peroxide is 134.8°C and the substance decomposes immediately after the melting process. MP is above the SADT.
Executive summary:

The determination of the melting point/melting range of DI-(4-METHYLBENZOYL)-PEROXID (INTEROX-PMBP) was based on EEC-Directive A.1 "Melting point/Melting range" (1984) and on OECD Guideline no. 102 "Melting Point/Melting Range" (1981), using the capillary method.

The melting point of bis(4-methylbenzoyl)peroxide is 134.8°C and the substance decomposes immediately after the melting process. MP is above the SADT.

Description of key information

The melting point of bis(4-methylbenzoyl)peroxide  is 134.8°C and the substance decomposes immediately after the melting process.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
134.8 °C

Additional information

This endpoint is supported by ten literature data.

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