tert-butylchlorodimethylsilane

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2015-04-09 to 2015-12-09

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling point/boiling range)

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7220 (Boiling Point / Boiling Range)

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Key result

Boiling pt.:

126.38 °C

Atm. press.:

1 030 hPa

Decomposition:

yes

Decomp. temp.:

> 100 °C

Remarks on result:

other: experiment 1

Key result

Boiling pt.:

126.14 °C

Atm. press.:

1 030 hPa

Decomposition:

yes

Decomp. temp.:

> 100 °C

Remarks on result:

other: experiment 2

Results

TGA and DSC curves are attached.

Preliminary test:

The TGA-curve of the test substance is shown in Figure 1. From 90°C upwards the weight of the sample decreased significantly. At 124°C the sample weight had decreased by 25%.

 

After the experiment it was observed that no test substance was present in the sample container.

Main study

The DSC-curve obtained with Experiment 1 is shown in Figure 2. Two endothermic peaks were observed between 75°C and 100°C and between 100°C and 150°C. The first effect obtained was most likely due to melting of the test substance. The second effect was most likely obtained due to evaporation of the test substance. The extrapolated onset temperature of the peak was 126.38°C. After the experiment it was observed that no test substance was present in the sample container.

 

To investigate the boiling peak, a closed sample container was applied in Experiment 2. Figure 3 shows the obtained DSC-curve. The extrapolated onset temperature of the second peak was 126.14°C. The peak did not shift to a higher temperature though, since it is likely to be boiling. Therefore Experiment 3 was performed in a closed sample container with more sample weight to extend the pressure. A similar temperature program as Experiment 2 was used. Figure 4 shows the obtained DSC-curve. The peak was not observed at 126°C and shifted most likely to higher temperature (i.e. approximately 250°C) which demonstrated that boiling of the test substance was the reason for the endothermic effect. For both experiments it was observed that after heating no test substance was present in the sample container.

 

The boiling temperature was determined as the average boiling temperature obtained from Experiment 1 (126.38°C) and Experiment 2 (126.14°C).

Conclusions:

A boiling point value of 126°C was determined in a reliable study conducted according to an appropriate test protocol, and in compliance with GLP.

Description of key information

Boiling point: 126°C (OECD 103)

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

126 °C

Additional information

A measured boiling point of 126°C was determined for tert-butyl(chloro)dimethylsilane in a study conducted in accordance with OECD Test Guideline 103, and in compliance with GLP. The result is considered to be reliable and is selected as key study. A supporting value of 125°C is reported in a handbook or collection of reliable data which has been subjected to peer-review and in which the original sources are traceable.

The supporting data are in good agreement with the key study.