This European Standard specifies minimum requirements for the material design, construction and workmanship, manufacturing processes and tests at manufacture of refillable seamless normalized gas cylinders made from carbon manganese steel of water capacities up to and including 0,5 litre for compressed, liquefiable and dissolved gases and up to 1 litre for carbon dioxide. This standard is applicable to cylinders manufactured from normalized carbon manganese steel with an Rm value of less than 850 MPa.