1,3,5-tris(3-mercaptopropyl)-1,3,5-triazinane-2,4,6-trione

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2018-10-11 to 2018-11-20

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

GLP compliance:

no

Type of method:

differential scanning calorimetry

Key result

Boiling pt.:

ca. 360 °C

Atm. press.:

1 atm

Decomposition:

yes

Decomp. temp.:

ca. 340 °C

Two DSC measurements in aluminum crucibles with a hole showed at around 340 °C the beginning of an exothermal effect which turned into a multistage endothermal effect at 360 °C to 370 °C. This multistage endothermal effect continued to 470 °C. No further endothermic or exothermic effects were observed up to the final temperature (500 °C). The mass loss after DSC measurements amounted from 97% to 100%. After the measurements black residues were observed.

The results of the DSC measurements are summarized in Table 1 below.

Table 1: Boiling point (DSC measurement)

Measurement no.	Test item / mg	Starting temperature / °C	End temperature / °C	Temperature range (endothermal) / °C	Onset (boiling) / °C	Crucible	Observations after measurement
1	17.57	25	500	360 - 450	multistage	Al with a hole	crucible and crucible cap coloured into black; mass loss: 100%
2	29.68	25	500	360 - 470	multistage	Al with a hole	crucible and crucible cap coloured into black; mass loss: 97%

 

It is assumed, that during the DSC measurements the test item decomposed beginning at around 340 °C (exothermal effect). This assumption was supported by the observation of a black residue after the measurement. The multistage endothermal effects starting at around 360 °C were supposed to result from evaporation of the test item or of fragments of the decomposed test item.

Conclusions:

The test item boils under decomposition at around 360 °C.

Executive summary:

The boiling point of the test item was investigated by DSC measurement according to OECD 103. The test item starts to decompose at around 340 °C which is indicated by an exothermal effect. Subsequent endothermal effects starting at around 360 °C indicate evaporation of the test item and/or its decomposition products. To conclude, the test item boils under decomposition at around 360 °C.

Description of key information

The test item boils under decomposition at around 360 °C.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

360 °C

Additional information

The test item starts to decompose at around 340 °C which is indicated by an exothermal effect. Subsequent endothermal effects starting at around 360 °C indicate evaporation of the test item and/or its decomposition products.