Registration Dossier
Registration Dossier
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EC number: 203-405-2 | CAS number: 106-51-4
Boiling point
Administrative data
- Endpoint:
- boiling point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 03.02.2018 - 06.04.2018
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 018
- Report date:
- 2018
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 103 (Boiling Point)
- Deviations:
- not specified
- GLP compliance:
- no
- Type of method:
- differential scanning calorimetry
Test material
- Reference substance name:
- p-benzoquinone
- EC Number:
- 203-405-2
- EC Name:
- p-benzoquinone
- Cas Number:
- 106-51-4
- Molecular formula:
- C6H4O2
- IUPAC Name:
- 1,4-benzoquinone
- Test material form:
- solid: particulate/powder
Constituent 1
Results and discussion
Boiling point
- Key result
- Atm. press.:
- 1 013 hPa
- Decomposition:
- yes
- Decomp. temp.:
- >= 160 °C
Any other information on results incl. tables
The test item shows an endothermic effect in the temperature range of 105 – 125 °C, which can be associated with a melting of the test item. A second endothermic effect was observed in the temperature range of 150 – 200 °C, which cannot be clearly assigned to a boiling of the test item. No further thermal effects could be observed up to the maximum test temperature of 500 °C.
Table1: Results of the DSC-measurements
No. |
Sample weight / mg |
Onset of Effect / °C |
Range of effect / °C |
Weight loss / mg |
Atmospheric pressure / hPa |
Remark |
PN15078 |
11.58 |
112.19 |
105 – 125 (endo) |
11.45 |
1002.0 |
Figure 1 |
PN15079 |
12.27 |
112.04 |
105 – 125 (endo) |
11.28 |
1002.0 |
Figure 2 |
The second endothermic effect canot not be assigned to a boiling of the test item, since the test item starts to decompose at a temperature of 160 °C (see capillary method). Due to this result, the test item has no boiling point before its decomposition starting at a temperature of approx. 160 °C.
Applicant's summary and conclusion
- Conclusions:
- Based on a DSC measurement, p-benzoquinone decomposes at 160°C.
- Executive summary:
The test item p-Benzoquinone has no boiling point up to its decomposition starting at approx. 160 °C as determined by differential scanning calorimetry and capillary method according to Regulation EC No. 440/2008 Method A.2. and OECD Test Guideline 103 (1995).
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