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