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Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

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Administrative data

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2007-09-06 to 2007-09-16
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
EU A1
GLP compliance:
yes (incl. QA statement)
Type of method:
thermal analysis
Atm. press.:
ca. 101 300 Pa
Decomposition:
yes
Remarks:
starting from 534 K (260°C)
Decomp. temp.:
ca. 260 °C
Sublimation:
no
Remarks on result:
other: Decomposition range 260 - 335°C

Assignment of the DSC thermal events was performed with the aid of visual observations recorded during a metal block apparatus assessment of the test material. The test material was observed to discolour to pale yellow/brown at 270°C and then discolour further as heating continued resulting in black solid remaining on completion of the assessment at 335°C.

  Thermographic data 1. run   2. run  
    Temperature      
Thermal event Interpretaition °C K °C K
Endo-exotherm Appr. Onset of initial decomposition ( endotherm) 260,59 534 260,89 534
  Extrapolated onset of initiol decomposition (endotherm) 271,26 544 271,05 544
  Peak of initial decomposition (endotherm) 275,45 549 274,77 548
  Peak of initial decomposition (exotherm) 283,66 557 282,50 556
  End of initial decomposition 292,03 565 291,19 564
endotherm Appr. onset of secondary decomposition 312,15 585 313,80 587
  Peak of secondary decomposition 345,69 619 344,99 618
Conclusions:
The test material decomposed from appr. 534 K. Similar thermographic profiles were obtained using air an nitrogen atmospheres.; this indicates that the observed decomposition in both determinations is probably thermal and not oxidative.
Executive summary:

No distinct melting point could be determined. Range of decomposition is appr. 260 to 345 °C.

Description of key information

The substance decomposes in two stages beginning from 260°C and ending at 312°C (determined by Differential Scanning Calorimetry).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
260 °C

Additional information