The diaphragm rubber plate of plate and frame filter press is made of chloroprene rubber (DuPont/Chongqing Longevity), which is modified by mixing and moulded by high-pressure composite vulcanization with steel skeleton. The sealing performance of the filter plate is good, the working filtration pressure is up to 1.2MPa, the water content of the mud cake is low, and the operating environment is good; the filter plate has high strength and long service life, and the temperature resistance of the plate can be up to 120℃; the steel skeleton can be recycled many times, and the comprehensive maintenance cost is low. FB XY-YZ 800/1800-M filter press has been recognised as the first set of major equipment products in Jiangsu Province.