... ,50mm, 76mm,90mm Material: SS304,SS316,SS316L,SS410 Metal pall ring is made of materials like carbon steel, stainless steel or ... towers under vacuum to treat thermosensitive, decomposable, polymerizable or cokable systems, so it is widely used in packing towers in petrochemical ... steel including 304, 304L, 410,316, 316L, SS410. Metal Pall Ring