This Standard specifies the requirements for labelling and colour coding to identify the contents of compressed gas cylinders for industrial, scientific, medical and refrigerant gases, which are used in accordance with AS 2030, Parts 1 and 2. Colour coding includes special identification for eductor tubes to indicate liquid withdrawal. This Standard applies to gas cylinders of water capacity in the range 0.1 kg to 150 kg. Cylinders above this size may follow this Standard. This Standard does not apply to cylinders used for self contained underwater breathing apparatus (SCUBA), self contained breathing apparatus (SCBA), or fire extinguishing agents and portable fire extinguishers. For identification of these cylinders reference should be made to the relevant product or application Standard. Gases intended for non-medical breathing purposes may use the same colours as medical gas cylinders. The colour coding requirements of this Standard do not apply to liquid petroleum gas (LP Gas) cylinders in a cylinder of 12 kg water capacity or less, which are usually considered for domestic use and are finished in a range of colours. The colour coding requirements of this Standard do not apply to cylinders which are either imported for use but not refilling in Australia (colours of country of origin are applicable), nor for cylinders which are imported for the specific purpose of filling for export.