See the Propane page under the Pure Gases Tab on the Menu of our Specialty Gas & Equipment Catalog for detailed information of gas purity http://www.airgassgcatalog.com/catalog/
Specifications
Size 35 High Pressure Industrial Cylinder
DOT Specification: 3AA-2015 - Canada 3AA-M154
O.D.: 7" - 18 cm
Length: 19" - 48 cm
Weight: 26 lbs - 12 kg
Linde = 007
Air Liquide = 7
Praxair = G
Matheson Trigas = 3
Scott Specialty Gases = C
Sizes may vary by location. Contact your Airgas representative or local branch location for availability in your area.