Registration Dossier
Registration Dossier
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EC number: 700-169-7 | CAS number: 7646-67-5
Boiling point
Administrative data
Link to relevant study record(s)
- Endpoint:
- boiling point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 12 April 2007 to 21 September 2007
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.2 (Boiling Temperature)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 103 (Boiling point/boiling range)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- method according to Siwoloboff
- Key result
- Decomposition:
- yes
- Decomp. temp.:
- 130 °C
- Remarks on result:
- not determinable
- Conclusions:
- The boiling temperature of HEAA was not determinable; the test substance underwent chemical change from approximately 130°C without boiling.
Reference
In the trial determinations, it was evident that the test substance was changing chemically without boiling. At a heating rate of 1°C/min, this change was apparent from approximately 135°C with the sample becoming hazy and, subsequently, more viscous and gel-like. At the higher heating rate of 10°C/min, physical change was not obvious until approximately 175°C, above which temperature some evolution of gas and discolouration was noted, as well as increased viscosity.
To investigate further, differential scanning calorimetry (DSC) was run and showed that the onset of chemical change was dependent on heating rate. Using a Mettler Toledo FP900 Thermosystem with FP85 DTA/DSC measuring cell, in an air atmosphere at a heating rate of 5°C/min, a DSC trace was obtained. It showed the onset of complex exotherms from approximately 130°C. When a similar scan was performed at 10°C/min, the onset of this exotherm was at a higher temperature (approximately 145°C).
Description of key information
The boiling temperature of HEAA was not determinable; the test substance underwent chemical change from approximately 130°C without boiling.
Key value for chemical safety assessment
- Temperature of decomposition (state purity):
- 130 °C
Additional information
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