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Physical & Chemical properties

Flammability

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Reference
Endpoint:
pyrophoric liquids
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Principles of method if other than guideline:
Not reported

Sulphur trioxide is reported to be non-flammable

Interpretation of results:
not classified based on GHS criteria
Conclusions:
Sulphur trioxide does not meet the criteria as a pyrophoric liquid.
Executive summary:

Sulphur trioxide does not meet the criteria as a pyrophoric liquid.

Description of key information

Sulphur trioxide itself is non-flammable. However it is known from experience of use that sulphur trioxide can react with substances such as wood or fabrics with sufficient heat of hydration to cause ignition.

Key value for chemical safety assessment

Flammability:
non flammable

Additional information

Sulphur trioxide itself is non-flammable. However it is known from experience of use that sulphur trioxide can react with substances such as wood or fabrics with sufficient heat of hydration to cause ignition.

Justification for classification or non-classification

No classification is proposed: the substance is non-flammable.