ANNEX I

E 943a BUTANE

Synonyms	n-Butane
Definition
Chemical name	Butane
Chemical formula	CH3CH2CH2CH3
Molecular weight	58,12
Assay	Content not less than 96 %
Description	Colourless gas or liquid with mild, characteristic odour
Identification
A. Vapour pressure	108,935 kPa at 20 oC
Purity
Methane	Not more than 0,15 % v/v
Ethane	Not more than 0,5 % v/v
Propane	Not more than 1,5 % v/v
Isobutane	Not more than 3,0 % v/v
1,3-butadiene	Not more than 0,1 % v/v
Moisture	Not more than 0,005 %