trans-2-(4-Bromo-3-fluorophenyl)-5-butyl-[1,3]dioxane

Stability: thermal, sunlight, metals

Link to relevant study record(s)

Reference

Endpoint:

thermal stability

Type of information:

experimental study

Adequacy of study:

key study

Study period:

from 2018-10-24 to 2019-01-28

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 113 (Screening Test for Thermal Stability and Stability in Air)

Deviations:

no

GLP compliance:

no

Test substance thermally stable:

yes

Key result

Operating temp.:

> 25 - < 500 °C

Sublimation:

not determined

Transformation products:

not specified

Test substance stable to sunlight:

not determined

Test substance stable to metals / metal ions:

not determined

Two DSC measurements in closed glass crucibles with the test item showed an endothermal effect in the temperature range of 35 - 55 °C and an exothermal effect in the temperature range of 290 – 410 °C with a maximum energy release of 402 J/g. Starting at around 410 °C the course of the baseline indicated a pressure build up. Therefore, an additional measurement in a high pressure crucible was performed. The DSC measurement in a closed high pressure crucible with the test item showed an endothermal effect in the temperature range of 35 - 55 °C and multiple exothermal effects. The first exothermal effect occurred in the temperature range of 135 -175 °C with an energy release of 29 J/g. The second exothermal effect in the temperature range of 190 - 340 °C showed an energy release of 269 J/g. The third exothermal effect in the temperature range of 340 - 420 °C showed an energy release of 572 J/g.

Table 1: Thermal stability (DSC measurements)

Ident-No.	Weight / mg	Final temperature / °C	Temperature range / °C	Type of effect	Energy / J/g
38300	12.18	500	35 – 55 325 – 410	Endothermal Exothermal	n.r. 117
38296	11.59	500	35 – 55 390 – 410	Endothermal Exothermal	n.r 402
38315	25.06	500	35 – 55 135 – 175 190 – 340 340 – 420	Endothermal Exothermal Exothermal Exothermal	n.r. 29 269 572

  n.r.: not relevant

Conclusions:

According to the OECD TG 113 criteria, the test item was considered to be thermal stable at room temperature as no decomposition or chemical transformation was found below 150 °C.

Executive summary:

A study was conducted according to OECD TG 113 to determine the thermal stability of the test item using DSC measurement. The test item was weighed into a closed glass crucible under nitrogen. For the test on thermal stability, the crucibles were heated up from ambient temperature to 500 °C with a heating rate of 3 K/min. Two DSC measurements in closed glass crucibles with the test item showed an endothermal effect in the temperature range of 35 - 55 °C and an exothermal effect in the temperature range of 290 – 410 °C with a maximum energy release of 402 J/g. Starting at around 410 °C the course of the baseline indicated a pressure build up. Therefore, an additional measurement in a high pressure crucible was performed. The DSC measurement in a closed high pressure crucible with the test item showed an endothermal effect in the temperature range of 35 - 55 °C and multiple exothermal effects. The first exothermal effect occurred in the temperature range of 135 -175 °C with an energy release of 29 J/g. The second exothermal effect in the temperature range of 190 - 340 °C showed an energy release of 269 J/g. The third exothermal effect in the temperature range of 340 - 420 °C showed an energy release of 572 J/g. According to the OECD TG 113 criteria, the test item was considered to be thermal stable at room temperature as no decomposition or chemical transformation was found below 150 °C.

Description of key information

According to the OECD TG 113 criteria, the test item was considered to be thermal stable at room temperature as no decomposition or chemical transformation was found below 150 °C.

Additional information

A study was conducted according to OECD TG 113 to determine the thermal stability of the test item using DSC measurement (reference 4.19-1). The test item was weighed into a closed glass crucible under nitrogen. For the test on thermal stability, the crucibles were heated up from ambient temperature to 500 °C with a heating rate of 3 K/min. Two DSC measurements in closed glass crucibles with the test item showed an endothermal effect in the temperature range of 35 - 55 °C and an exothermal effect in the temperature range of 290 – 410 °C with a maximum energy release of 402 J/g. Starting at around 410 °C the course of the baseline indicated a pressure build up. Therefore, an additional measurement in a high pressure crucible was performed. The DSC measurement in a closed high pressure crucible with the test item showed an endothermal effect in the temperature range of 35 - 55 °C and multiple exothermal effects. The first exothermal effect occurred in the temperature range of 135 -175 °C with an energy release of 29 J/g. The second exothermal effect in the temperature range of 190 - 340 °C showed an energy release of 269 J/g. The third exothermal effect in the temperature range of 340 - 420 °C showed an energy release of 572 J/g. According to the OECD TG 113 criteria, the test item was considered to be thermal stable at room temperature as no decomposition or chemical transformation was found below 150 °C.