... exchange resin, but the selectivity is much strong. The defluorination effect of the actived alumina is good. The capacity is stable, ... no crack. It can widely used in the deep drying of cracked gas, ethylene and propylene, hydrogen-generation, air separation, ... filter housing, Hankison element)etc.Totally 13 series,300sorts of products which are widely used in electrical,metallurgy,electron,mechanism ...