Registration Dossier
Registration Dossier
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EC number: 214-230-6 | CAS number: 1115-70-4
Boiling point
Administrative data
Link to relevant study record(s)
- Endpoint:
- boiling point
- Data waiving:
- study technically not feasible
- Justification for data waiving:
- the study does not need to be conducted because the substance is a solid which decomposes before boiling
- GLP compliance:
- no
- Type of method:
- differential scanning calorimetry
- Conclusions:
- The test item decomposed before boiling could occur.
- Executive summary:
The boiling point/boiling range are determined by differential scanning calorimetry (DSC). The test item and the reference are heated up from the starting temperature to the final temperature at a constant heating rate in a defined atmosphere (nitrogen). Open cruicibles are used as containers for the test item and as empty reference crucible. The quantity of heat absorbed or released is measured and recorded.
One DSC measurement in aluminium crucibles with a hole showed an ambiguous course of the baseline after melting. An endothermal effect could be assumed in the temperature rage 275 -360 °C. The mass loss after the DSC measurements amounted to 84%. After the measurement black residues were observed.
The test item decomposed prior to reaching the boiling point.
Reference
Under consideration of the results from the thermal stability (ambiguous onset) and the capillary method it was concluded that the test item decomposed before boiling could occur.
Description of key information
The substance decomposed before boiling could occur.
Key value for chemical safety assessment
Additional information
DSC
The boiling point/boiling range are determined by differential scanning calorimetry (DSC). The test item and the reference are heated up from the starting temperature to the final temperature at a constant heating rate in a defined atmosphere (nitrogen). Open cruicibles are used as containers for the test item and as empty reference crucible. The quantity of heat absorbed or released is measured and recorded.
One DSC measurement in aluminium crucibles with a hole showed an ambiguous course of the baseline after melting. An endothermal effect could be assumed in the temperature rage 275 -360 °C. The mass loss after the DSC measurements amounted to 84%. After the measurement black residues were observed.
Capillary tube in a metal block
The test item is filled into a sample tube at ambient temperature. The sample tube is then inserted into the apparatus. The apparatus has a metal block with electrical heating system for the heating of the tubes. The tube is heated to the set point (start temperature) of the measurement. From the set point the tube is heated with a constant heating rate to the maximum tempearture. The maximum temperature of the equipment is limited to 410 °C.
A measurement with the capillary method was performed to clarify the results of the DSC measurements. Since this measurement was performed only as a verifying screening a high heating rate of 10K/min was chosen and therefore the absolute temperature values derived with the capillary method are not as accurate as the DSC results.
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