reaction mass of diethyl (E)-2-methylbut-2-enedioate and diethyl (Z)-2-methylbut-2-enedioate

Stability: thermal, sunlight, metals

Link to relevant study record(s)

Reference

Endpoint:

thermal stability

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

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

Deviations:

no

GLP compliance:

no

Remarks:

This study was not performed under the Principles of Good Laboratory Practice (GLP).

Test substance thermally stable:

yes

Key result

Operating temp.:

150 °C

The test item in a closed glass crucible showed a exothermic effect in the temperature range of 150 – 200 °C and a second one in the temperature range of 240 to >300 °C, with an overall decomposition energy of >-170 J/g.

Table 1: Results of the DSC-measurements on thermal stability

Sample weight / mg	Start of effect / °C	Energy / J/g
7.36	150	> -170

 

Conclusions:

The test item is termally stable at rom temperature.

Executive summary:

A study was conducted according to OECD TG 133 to determine the thermal stability of the test item using DSC measurement. The test item was weighed in under an inert atmosphere (nitrogen) into the glass crucible. The upper end of the crucible was closed by melting with an oxyhydrogen flame. The crucible was then check-weighed with an accuracy of 0.01 mg. As reference crucible, a glass crucible with aluminium oxide was used. For the test on thermal stability, the crucibles were heated up from room temperature to 300 °C with a heating rate of 3 K/min. The test item in a closed glass crucible showed an exothermic effect in the temperature range of 150 – 200 °C and a second one in the temperature range of 240 to > 300 °C, with an overall decomposition energy of >-170 J/g. According to the OECD guideline 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 is termally stable at rom temperature.

Additional information

A study was conducted according to OECD TG 133 to determine the thermal stability of the test item using DSC measurement. The test item was weighed in under an inert atmosphere (nitrogen) into the glass crucible. The upper end of the crucible was closed by melting with an oxyhydrogen flame. The crucible was then check-weighed with an accuracy of 0.01 mg. As reference crucible, a glass crucible with aluminium oxide was used. For the test on thermal stability, the crucibles were heated up from room temperature to 300 °C with a heating rate of 3 K/min. The test item in a closed glass crucible showed an exothermic effect in the temperature range of 150 – 200 °C and a second one in the temperature range of 240 to > 300 °C, with an overall decomposition energy of >-170 J/g. According to the OECD guideline 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.