... , USDA, FDA 2.Non-Metallic Materials: Polypropylene, PVDF Pneumatic Diaphragm Pumps are ideally suited for highly corrosive fluids, intermittent/ondemand ... PTFE options in diaphragms and check.CharacteristicMetallic Materials: Aluminum, Cast Iron, Stainless Steel and Alloy CNon-Metallic Materials: Polypropylene, PVDF, ... , USDA, FDA Technical parameter working principle LH Type Pneumatic diaphragm Pump