Ion exchange resin is high polymer compound, so it's performance for manufacturing process, the formula materials, polymerization temperature, crosslinking agent different and different, its main performance is divided into two parts. (1) physical properties (1) appearance resin is a kind of transparent or translucent material, because of its composition is different, of different colors, such as styrene resin yellow, also have been black and auburn, but to little effect on performance. Usually, raw material more or impurity crosslinking agent, the color of the resin a bit deep (but resin in the operation process, for any variety of reasons, sometimes color also can be change). Resin spherical shape, ball ratio to 90% above requirements. (2) the particle size of the size of the resin particles will affect exchange rate, pressure loss and reverse wash effect. The particle size can't differ too big. Used in water treatment of ion exchange resin particles to the 20 to 40 eye is advisable. The expression method of particle size to effective size and non-uniform coefficient to said. (3) density relation to water treatment process and filled amount of resin. The expression method of density are: dry true density (generally 1.6 g/cm3 or so), wet true density (generally 1.04 ~ 1.30 g/cm3 between), depending on the wet density (generally in 0.60 ~ 0.80 g/cm3 between). (4) the moisture content, the moisture content of resin, the bigger the said porosity, the bigger the crosslinking degree and smaller. (5) resin after soaking in the swelling ratio swelling, it and crosslinking degree, active groups, exchange capacity, water electrolyte density, can exchange the nature of the ion and so on. Resin in exchange and regeneration process will happen bilge shrink phenomenon, many swell-shrink resin easy to break. 6 wear resistance of the mechanical strength reflect resin. It should ensure that every year resin consumption of no more than 7%. 7 solubility resin contains low polymer to gradually dissolved, in use process resin will also happen glue to dissolve. 8) heat resistance resin temperature 100 ℃ or so Yang, a strong alkali resistant to 60 ℃ Yin resin, and the weak alkaline Yin resin can be 80 ℃ temperature. But in less than or equal to 0 ℃, ice and easily broken. 9) conductivity dry resin don't conductive, wet resin can be conductivity. (2) chemical properties (1) of ion exchange resin exchange reaction reversible, thus it can exchange, also can be recycled, can use repeatedly. (2) with acid, alkali. H + type of cation exchange resin and OH-type anion exchange resin, etc and the performance and electrolyte acid, alkali identical, in the water can ionization out of H + and OH-ability. (3) and hydrolysis and with performance. Because it as electrolyte properties, can with acid, base on neutralization reaction, but also hydrolysis. (4) the ion exchange resin absorption ability of ion is differ, selective. (5) exchange capacity. Said its exchange ions amount of how much. According to the shape of the resin can be divided into balance exchange capacity, and the exchange capacity, working exchange capability, etc.