4'-Butyl-4-ethoxy-2,3-difluoro-1,1'-biphenyl

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 2016-06-30 to 2016-08-12

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

Remarks on result:

other: stable

Test substance stable to sunlight:

not determined

Test substance stable to metals / metal ions:

not determined

A first DSC-measurement (closed glass crucible in a high pressure crucible) with the test item showed an endothermal effect in the temperature range of 35 - 55 °C. Up to the final temperature (500 °C) no further endothermal or exothermal effect was observed.

A second DSC-measurement (closed glass crucible) with the test item showed an endothermal effect in the temperature range of 35 - 50 °C and an exothermal effect in the temperature range of 405 - 475 °C with an energy release of 206 J/g. Up to the final temperature (500 °C) no further endothermal or exothermal effect was observed.

Table 1: Thermal stability (DSC measurements)

Ident-No.	Weight / mg	Final temperature / °C	Temperature range / °C	Type of effect	Energy / J/g
35667	10.63	500	35 – 55	Endothermal	n.r.
35669	11.71	500	35 – 50 405 - 475	Endothermal Exothermal	n.r 206

 

Conclusions:

The test item was considered to be thermal stable at room temperature.

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. A first DSC-measurement (closed glass crucible in a high pressure crucible) with the test item showed an endothermal effect in the temperature range of 35 - 55 °C. Up to the final temperature (500 °C) no further endothermal or exothermal effect was observed. A second DSC-measurement (closed glass crucible) with the test item showed an endothermal effect in the temperature range of 35 - 50 °C and an exothermal effect in the temperature range of 405 - 475 °C with an energy release of 206 J/g. Up to the final temperature (500 °C) no further endothermal or exothermal effect was observed. 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

The test item was considered to be thermal stable at room temperature.

Additional information

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. A first DSC-measurement (closed glass crucible in a high pressure crucible) with the test item showed an endothermal effect in the temperature range of 35 - 55 °C. Up to the final temperature (500 °C) no further endothermal or exothermal effect was observed. A second DSC-measurement (closed glass crucible) with the test item showed an endothermal effect in the temperature range of 35 - 50 °C and an exothermal effect in the temperature range of 405 - 475 °C with an energy release of 206 J/g. Up to the final temperature (500 °C) no further endothermal or exothermal effect was observed. 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.