... steel 304, 304L, 316, 316L, 410. Application: separation/absorb/distillation/cooling tower. Metal pall ring is the new type packing which is ... of window leaf curved into the ring center , making the air ring wall openings , liquid distribution performance than Raschig rings ... HT and be widely used in the column of drying, cooling, washing and recovery etc in Chemical, petrochemical and metallurgical ...