p-benzoquinone

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:

2018

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

Test material information

Constituent 1

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

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	112.19 183.41	105 – 125 (endo) 150 – 200 (endo)	11.45	1002.0	Figure 1
PN15079	12.27	112.04 183.44	105 – 125 (endo) 150 – 200 (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).