... 16mm,25mm,38mm,50mm,76mm >20 years professional manufactuer YIQUAN METAL PALL RINGMetal tower packing is made of material like carbon ... high separation efficiency and so on. It is especially suitable for rectification towers under vacuum to treat thermo sensitive, decomposable, polymerizable ... steel, stainless steel including 304, 304L, 410,316, 316L. YIQUAN metal pall ring for petrochemical industry