Registration Dossier
Registration Dossier
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EC number: - | CAS number: -
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:
- 03 February 2021 to 22 March 2021
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 103 (Boiling Point)
- Version / remarks:
- 1995
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.2 (Boiling Temperature)
- Version / remarks:
- 2008
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- differential scanning calorimetry
- Key result
- Atm. press.:
- >= 100.8 - <= 103.4 kPa
- Decomposition:
- yes
- Decomp. temp.:
- ca. 140 °C
- Conclusions:
- The test item was determined to decompose before boiling from approximately 140 °C (413 K) at 100.8 to 103.4 kPa. As the test item decomposed, no value for boiling point could be determined.
- Executive summary:
The test item decomposed before boiling from approximately 140 °C (413 K) at 100.8 to 103.4 kPa, by differential scanning calorimetry, a procedure designed to be compatible with Method A.2 Boiling Temperature of Commission Regulation (EC) No. 440/2008 of 30 May 2008 and Method 103 of the OECD Guidelines for Testing of Chemicals, 27 July 1995. As the test item decomposed, no value for boiling point could be determined.
Reference
From test item information supplied by the Sponsor, the test item was noted to contain water and free acid as impurity(/ies). Therefore, the wide exotherm noted from approximately 80 to 140 °C was considered to be due to evaporation of the water and sulphuric acid from the molten test item.
The test item was then determined to decompose from approximately 140 °C (413 K). As a result of the initial low rate of enthalpy change during decomposition, the start temperature could only be approximated. As the test item decomposed, no value for boiling point could be determined.
Similar thermographic profiles were obtained using air and nitrogen atmospheres. This indicated that the decomposition was probably thermal and not oxidative.
Description of key information
Decomposition before boiling from approximately 140°C; Walker, J.A. (2021)
Key value for chemical safety assessment
- Temperature of decomposition (state purity):
- 140 °C
Additional information
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