Indian gas cylinder PKL 0.5 kilogram

PKL Indian refillable gas cylinder 0.5 kg made in India company pkl holds the Saudi quality mark (G) what is the thickness of the metal used to manufacture the cylinder 1.6 mm for the 0.5 kg cylinder what is the welding method a mixture of copper and bronze in a continuous thermal oven with a protective atmosphere what is the type of safety valve in the cylinder in case of explosion the safety release valve opens automatically between 22-30 bar and closes when it is above 20 bar