Metal Pall Ring 1.material: SS316, SS304, SS304L, etc 2 size:16mm,25mm,38mm,50mm,76mm >20 years professional manufactuer YIQUAN ... , high separation efficiency and so on. It is especially suitable for rectification towers under vacuum to treat thermo sensitive, decomposable, polymerizable ... steel including 304, 304L, 410,316, 316L. YIQUAN metal pall ring for petrochemical industry