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Physical & Chemical properties

Melting point / freezing point

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melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
October 2017 - March 2018
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
OECD Guideline 102 (Melting point / Melting Range)
according to guideline
EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
yes (incl. QA statement)
Type of method:
capillary method
Specific details on test material used for the study:
Identity: Triazolone
Appearance: Off-white powder
Storage conditions: Room temperature (15 to 25°C), dark
Batch number: 0727/16
Purity: 99%
Expiry date: 28 April 2019
Date received: 28 April 2017
Key result
Melting / freezing pt.:
>= 235 - <= 238 °C
Atm. press.:
1 Bar

Melting stage       Sample I       Sample II

A                     178                     177

B                     179                     179

C                     235                     235

D                     237                     237

E                     238                     238

Triazolone was found to melt over the range 235 to 238°C.
Executive summary:

A study was performed to determine some physicochemical properties of the test item, Triazolone. The methods followed are amongst those described in Council Regulation (EC) No. 440/2008 and the OECD Guidelines for the Testing of Chemicals. The physicochemical properties which have been determined in this study are detailed below, together with the result obtained for each test.

EC       OECD              Test                     Result

A.1       102       Melting temperature       235 to 238°C

Description of key information

Triazolone was found to melt over the range 235 to 238°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
235 °C

Additional information