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Description of key information

The flammability limits of the substances in the category range from 1.8 to 15%.

Key value for chemical safety assessment

extremely flammable

Additional information

Data from the CRC handbook (Lide 2008) were available for the substances methane, ethane, propane, butane and isobutane. Data from the Merck handbook (O’Neill 2006) were available for methane, ethane and propane. The information is taken from reliable peer reviewed handbooks and so can be considered reliable and suitable for use for this endpoint.

The flammability limits of methane are 5-15%, ethane are 3-12.5%, propane are 2.1-9.5%, butane are 1.9-8.5% and isobutane are 1.8-8.4%.

Justification for classification or non-classification

The lower and upper explosion limits are are 2.1- 15%.This data would result in a classification of the Petroleum gases as category 1 flammable gas and the hazard statement 'extremely flammable gas'.