Using compressed gas as a power source for a variety of corrosive liquid , with particles of liquid , high viscosity , volatile, flammable, poisonous liquid can be pumped optical exhaustion . There are four pneumatic diaphragm material: plastic , aluminum, cast iron , stainless steel. Pneumatic diaphragm pumps were used nitrile,rubber,neoprene , Viton , Teflon , depending on the liquid medium , poly ethylene forty-six . To meet the needs of different users .