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Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2015-06-12 to 2015-06-25
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
no
GLP compliance:
no
Other quality assurance:
ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
Type of method:
differential scanning calorimetry
Key result
Decomposition:
yes
Decomp. temp.:
267 °C
Remarks on result:
other: No normal boiling point was found. Partial boiling starts at around 267°C, probably already associated with decomposition

Preliminary thermogravimetric measurement:

A preliminary thermogravimetric measurement was performed over a temperature range from room temperature to 600°C. The mass loss occurs in one step, reaching a maximum at 278 °C. Up to 600°C a small dark residue remained in the crucible. The remaining residue shows that pure boiling does not take place (see attached TG curve).

DSC measurements:

The DSC measurements were performed twice. To determine a possible boiling point more precisely a crucible lid with a hole of 50 μm diameter was used in the measurements. The small hole causes the generation of a defined atmosphere at constant pressure inside the

crucible and allows measurements at near equilibrium conditions, thus preventing evaporation of the test material before reaching the boiling point.

Upon further heating a sharp but noisy endothermic peak with a peak maximum temperature at 289°C and an extrapolated onset temperature of 266/267°C was registered. Reweighing after the measurement the sample had lost approx. 94 % of its mass.

The peak shape and the remaining residue demonstrate that the recorded reaction most probably represents simultaneous boiling and decomposition (See attached DSC curve).

Conclusions:
The substance was observed to undergoes decomposition from about 267°C using a relevant test method. The result is considered to be reliable.

Description of key information

Boiling point: decomposition without boiling from about 267°C at 998.9 hPa (OECD 103)

Key value for chemical safety assessment

Additional information

The boiling point of the substance has been determined using Differential Scanning Calorimetry (DSC) in accordance with OECD 103 and in compliance with a known quality system (ISO 17025). The substance was observed to undergo thermal decomposition from about 267°C.

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