... .3-53.8L 3)Standard:GB11638,DOT-8AL,ISO3807-1 Asbestos-free acetylene cylinder is an international advanced product independently-researched ... . Deep drawn by one steel plate with advanced teachnology, asbestos-free acetylene gas, lightweight, work-of-art appearance. 1) Outside ... : 6.3-53.8L3)Standard:GB11638,DOT-8AL,ISO3807-1 Asbestos-free acetylene cylinder