2-chloro-2-methylpropane

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

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.:

< 200 °C

Sublimation:

not determined

Transformation products:

not measured

Test substance stable to sunlight:

not determined

Test substance stable to metals / metal ions:

not determined

Thermal stability

A first DSC-measurement in a closed glass crucible with the test item showed an endothermal effect in the temperature range of 220 - 320 °C and an exothermal effect in the temperature range of 410 - 480 °C with a maximum energy of 137 J/g. The measurement was terminated at 500 °C.

A second DSC-measurement in a closed high pressure crucible with the test item showed an endothermal effect in the temperature range of 245 - 315 °C. No exothermal effects were observed up to the final temperature (500 °C).

The results are summarized in Table 1.

Table 1: Thermal stability (DSC measurement)

Ident-No.	Weight (mg)	Final temperature (°C)	Temperature range (°C)	Type of effect	Energy (J/g)
35472	10.69	500	220 - 320 410 - 480	Endothermal Exothermal	n.r. 137
35474	11.29	500	245 - 315	Endothermal	n.r.

n.r. = not relevant

Conclusions:

The test item is termal stable.

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 and the reference were heated up from ambient to the final temperature at a constant heating rate (3 K/min) in a defined atmosphere (nitrogen). Closed crucibles are used as containers for the test item and the reference. The quantity of heat absorbed or released is measured and recorded. Endothermic reactions of the test item were noticed in both tests. Furthermore in the first test an exothermal effect was observed in the range of 410 to 480 °C with a maximum energy of 137 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 substance is termal stable.

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 and the reference were heated up from ambient to the final temperature at a constant heating rate (3 K/min) in a defined atmosphere (nitrogen). Closed crucibles are used as containers for the test item and the reference. The quantity of heat absorbed or released is measured and recorded. Endothermic reactions of the test item were noticed in both tests. Furthermore in the first test an exothermal effect was observed in the range of 410 to 480 °C with a maximum energy of 137 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.