ANNEX I

E 943b ISOBUTANE

Synonyms	2-methyl propane
Definition
Chemical name	2-methyl propane
Chemical formula	(CH3)2CH CH3
Molecular weight	58,12
Assay	Content not less than 94 %
Description	Colourless gas or liquid with mild, characteristic odour
Identification
A. Vapour pressure	205,465 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 2,0 % v/v
n-Butane	Not more than 4,0 % v/v
1,3-butadiene	Not more than 0,1 % v/v
Moisture	Not more than 0,005 %