Indian gas cylinder PKL 0.5 kilogram

PKL Indian gas cylinder refillable 0.5 kg Indian company pkl holding the Saudi quality mark (G) what is the thickness of the metal from which the cylinder is made 1.6 mm for the 0.5 kg cylinder what is the welding method a mixture of copper and bronze in a continuous thermal furnace with a protective atmosphere what is the type of safety valve in the cylinder in case of explosion the safety release valve with automatic closing opens between 22-30 bar and closes when it is higher than 20 bar