Soluble PVA is soluble in water, the higher the water temperature, the greater the solubility, but it is almost insoluble in organic solvents. The solubility of PVA varies with the degree of alcoholysis and degree of polymerization. PVA with partial alcoholysis and low polymerization degree dissolves extremely fast, while PVA with complete alcoholysis and high polymerization degree dissolves slowly. As a general rule, the degree of alcoholysis is greater than the degree of polymerization for the influence on the solubility of PVA. some can swell at room temperature in water,such as JOYFORCE 0588, 1788, 2488. The others are easily soluble in water at room temperature,such JOYFORCE PVA0599, 1799, 2699. The PVA dissolution process is carried out in stages, namely: affinity wetting-swelling-infinite swelling-dissolution.