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Physical & Chemical properties


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flammable gases
Type of information:
experimental study
Adequacy of study:
key study
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
EU Method A.11 (Flammability (Gases))
GLP compliance:
yes (incl. QA statement)
Key result
lower explosion limit
ca. 9 % (not further specified)
Key result
upper explosion limit
> 11 % (not further specified)
 gas concentration (%w/w)  Ignition  Comment
 2 no
6    no  blue glow
 8  no  blue glow
 10  yes  small blue flame
 11  yes  small blue flame
 12  yes  large blue/orange flame
 14  yes medium blue flame
 13  yes  small blue flame
 11  yes  small blue flame
Interpretation of results:
Category 1 (flammable gases) based on GHS criteria
For EU classification, it is extremely flammable. However, based on expert internal assessments, the substance requires a substantial ignition energy and therefore is not expected to constitute risk under normal forseeable conditions of use.

Description of key information

A.11 method - lower flammability limit is expected to be between 8% and 10% (w/w) and the upper flammability limit lower than 14%.  
ASTM method - lower flammability limit 6.2%, upper flammability limit 12.3%

Key value for chemical safety assessment


Additional information

Based on these results the lower flammability limit is expected to be between 8% and 10% (w/w) and the upper flammability limit lower than 14%. Based on additional testing using a methodology that deviates from the A.11 method (ASTM E681-04), the registrant has selected a lower flammability limit of 6.2% and the upper flammability limit at 12.3%.

Justification for classification or non-classification

Based on the available information, the substance meets the criteria for Flammable gas Category 1A. However, as the substance is not considered to be pyrophoric nor chemically unstable, and has at least a lower flammability limit of more than 6%, the substance will be classified as Flammable gas Category 1B (H221) in accordance with the 12th ATP of the Regulation (EC) No. 1272/2008 on the classification, labelling and packaging of substances and mixtures (CLP Regulation).