PVDF membrane, polyvinylidene fluoride membrane, is a kind of solid phase supporter commonly used in Western blotting. PVDF membrane is hydrophobic, and the pore size of the membrane is large or small. With the decrease of the pore size of the membrane, the binding of the membrane to proteins with low molecular weight is stronger. The membrane of 0.45um was selected for the protein of more than 20kDa, and the membrane of 0.2um was selected for the protein of less than 20kDa. PVDF membrane needs to be pretreated when it is used. The purpose of methanol treatment is to activate the positive groups on the membrane and make it easier to combine with the negatively charged proteins. PVDF membrane with high mechanical strength is an ideal solid support material for imprinting. Wuxi pinshang building materials Co., Ltd.'s Coated tile 1. PVDF membrane for water treatment, which is divided into ultrafiltration membrane and microfiltration membrane, is mainly used for pretreatment of sewage, desalination of sea water, removal of impurities such as macromolecules, bacteria, sediment, etc. 2. PVDF membrane for outdoor building, protection of glass, exterior wall, outdoor billboard, etc. for main users, mainly for aging and wear-resistant function 3. PVDF membrane for battery Including diaphragm advantages in fuel cell and lithium-ion polymer cell, high mechanical strength and tenacity, mould resistance, high wear resistance, high permeability resistance to gas and liquid, good heat stability, flame retardant, low smoke, good creep resistance during temperature rise, high purity, easy melt processing, resistance to most chemicals and solvents· It has the disadvantages of rigid and flexible form, UV and nuclear radiation resistance, impact resistance, weather resistance and low temperature resistance up to - 40 ℃.