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Physical & Chemical properties

Flammability

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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
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:
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

Description of key information

The substance, tetraethyl orthosilicate (CAS 78-10-4; EC No. 201-083-8):

•       Is flammable (based on a measured flash point of 54°C and boiling point 167.3°C)

•       In contact with water does not emits a flammable gas

•       Is not pyrophoric

Key value for chemical safety assessment

Flammability:
flammable

Additional information

The flammability of liquids is assessed on the basis of flash point.

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.

Lower and upper explosion limits in air of 1.3% and 23% respectively were reported for the substance in secondary sources to which reliability could not be assigned.

Justification for classification or non-classification

Tetraethyl orthosilicate is classified as Flammable Liquid Category 3 (H226: Flammable liquid and vapour) according to Regulation (EC) No 1272/2008. This is on the basis of a flash point of 54°C at 1013 hPa and a measured boiling point of 167.3°C at 1013 hPa.

Flammability in contact with air:

The substance is not classified for this hazard on the basis of Regulation (EC) No. 1272/2008.

Flammability in contact with water:

The substance is not classified for flammability in contact with water on the basis of Regulation (EC) No. 1272/2008.