Specification: GB10665-2004 Specification Superfine Grade First Grade Second Grade Gas yield(L/kg)(L/kg) 305 295-305 285-295 PH3 content in acetylene (PH3%) 0.06 0.08 0.08 H2S content in acetylene (H2S%) 0.1 0.1 0.1. Outer packing: Net in 250kg/100kg or 50kg new iron drums with nitrogen. Drum color:green/gray/black.