Silicon tetrachloride

Flammability

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

flammable liquids: obsolete as covered by section 'Flash point'

Data waiving:

study technically not feasible

Justification for data waiving:

the study does not need to be conducted because the substance is a liquid

Reference 2

Endpoint:

pyrophoric liquids

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the substance is known to be stable in contact with air at room temperature for prolonged periods of time (days) and hence, the classification procedure does not need to be applied

Reference 3

Endpoint:

substances / mixtures which in contact with water emit flammable gases

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Description of key information

Flammability: non-flammable liquid

Key value for chemical safety assessment

Flammability:

not classified

Additional information

The flammability of liquids is assessed on the basis of flash point. The study is considered unnecessary because the molecule contains no elements capable of propagating a flame.

There is no indication on the basis of structure and experience in handling and use that the substance is pyrophoric (flammable in contact with air) or flammable in contact with water.

Therefore, in accordance with Section 1 of REACH Annex XI, there is no need to conduct further flammability testing.

Justification for classification or non-classification

There is no evidence to suggest that the submission substance should be classified for flammability.

Reactivity hazards:

Justification for classification or non-classification:

Silicon tetrachloride reacts vigorously in the presence of water (see hydrolysis section), including moisture in the air. This may present a physical hazard and is reflected in the Classification of ‘Reacts violently with water’. One of the products of the reaction is hydrogen chloride, which is classified as corrosive.

 

Releases of hydrogen chloride or hydrogen vapours may over-pressurise the container or vessel, resulting in a sudden rupture of the container or vessel.

Classification and Labelling according to Regulation (EC) No. 1272/2008: EUH014: Reacts violently with water.

In addition, primary alcohols react with chlorosilanes almost as rapidly as water, forming hydrogen chloride; secondary and tertiary alcohols react less rapidly (CES 2003). Ammonia and the aliphatic amines react rapidly with chlorosilanes, generating heat and solids (ammonium and amine salts). Bases react violently with chlorosilanes, generating heat.

Therefore, it is important to keep the substance strictly free of water during manufacture and storage and also prevent contact with other incompatible materials.

Reference:

CES (2003). Centre Européen des Silicones Safe Handling of Chlorosilanes available online @ http://www.silicones.eu/uploads/Modules/Resources/chlorosilanes-manual-22082003.pdf