XB-22S is the homopolymer of vinylidene fluoride. It has good solubility in some solvent, suitable to make PVDF membrane by dissolving and curtain process. This kind of membrane is not be corroded by acid, alkali, strong oxidizer and halogen. It has good chemical stable performance in the aliphatic hydrocarbon, aromatic hydrocarbons, aldehydes, alcohols and some other organic solvent.