Yuhui C-SS12 is a premium grade gel-type strong acid cation (SAC) exchange resin based on sulfonated styrene-divinylbenzene (DVB) copolymers with standard Gaussian particle size distribution. Its 12% cross-linkage offers better performance on the resistance to oxidation compared to C-SS10. C-SS12 is developed to be used for industrial water softening when it works in sodium form and demineralization when it works in hydrogen form, especially for water with high content of oxidant.