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Physical & Chemical properties

Boiling point

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boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017-04-12 - 2017-06-01
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose for cross-reference:
reference to same study
according to guideline
OECD Guideline 103 (Boiling Point/Boiling Range)
according to guideline
EU Method A.2 (Boiling Temperature)
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Key result
Boiling pt.:
423.7 °C
Atm. press.:
1 013 hPa

During the heating phase a distinct endothermic effect was observed in the temperature range of 60 – 90 °C, which can be assigned to the melting of the test item. The test item showed a second endothermic signal in the temperature range of 290 – 460 °C that can be assigned to the boiling of the test item.

For the correction of the boiling temperature to standard pressure the test item was assigned to chemical group 1 (e.g. antraquinone). According to appendix 7.2 a correction value φ = 5.15 was used for the temperature of 400 °C.

The lowest measured onset temperature is corrected to the standard pressure to be 423.54 °C and the highest onset temperatureto be 423.81 °C. As the corrected onset temperatures in both tests deviate by less than 0.5 K from their mean value of 423.68 °C, the test item has a boiling point of 423.7 °C.

No further thermal effects were observed up to the test end temperature of 500 °C.

Table: Results of the DSC-measurements

Sample weight / mg

Onset of effect / °C

Range of effect / °C

Weight loss / mg

Atmospheric pressure / hPa



60 – 90 (endo)
290 – 450 (endo)





60 – 90 (endo)
290 – 460 (endo)



boiling point (at 1013 hPa): 423.7 °C
Executive summary:

The test item 2,4-Diethyl-9H-thioxanthen-9-one has a boiling point at atmospheric pressure (1013 hPa) of 423.7 °C as determined by differential scanning calorimetry [according to EU Method A.2. and OECD Test Guideline 103].

Description of key information

boiling point (determined using EU Method A.2 / OECD 103; GLP): 423.7 °C at 1013 hPa (arithmetic mean of two determinations)

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
423.7 °C

Additional information

The determination of the boiling point was carried out by differential scanning calorimetry (DSC) using a procedure designed to be compatible with EU Method A.2 and OECD Test Method 103. A reliability score of 1 was assigned, in accordance with the criteria for assigning data quality in line with the principles described by Klimisch (1997).