Diaphragm pump diaphragm material selection

　　Diaphragm pump, as an important fluid transfer equipment, its performance depends largely on its core components - diaphragm material. Diaphragm as a diaphragm pump in direct contact with the media components, the choice of material is directly related to the use of pump efficiency, safety and life. This article will be from a professional point of view, a detailed analysis of the diaphragm pump diaphragm of several common materials and their characteristics, and to explore their respective applicable media.

　　First, let's look at the rubber material. Rubber is a material with good elasticity and corrosion resistance, commonly used in pneumatic diaphragm pump diaphragm. Among them, nitrile rubber is a particularly suitable material for conveying petroleum and oil liquids, such as leaded gasoline, diesel fuel, hydraulic oil and so on. Its oil resistance and abrasion resistance make it ideal for such media. In addition, neoprene is also a widely used diaphragm material for the transportation of non-corrosive liquids such as sewage, tap water, seawater, etc.

　　Next in line is ethylene propylene diene diene (EPDM) rubber. Made using ethylene and propylene, this rubber is chemically stable and has a light density of raw rubber, making it a common rubber diaphragm for industrial use. It has good resistance to ozone, UV, aging, and oxidation, and can withstand weak acids, alkalis, alcohols, and ketone liquids, making it suitable for a wide range of chemical liquids.

　　Polytetrafluoroethylene (PTFE), also known as Teflon, is a polymer compound with excellent corrosion resistance. Its non-moisture-absorbing, non-flammable, oxygen and UV stabilizing properties make it resistant to aqua regia and most organic solvents, even at high temperatures, without compromising quality or performance. Therefore, PTFE diaphragms are especially suitable for conveying strong corrosive media and high temperature media.

　　In addition, there is the material polyperfluoroethylene propylene (FEP). It has excellent corrosion resistance and flexibility at a relatively high price. Because it is more flexible than PTFE, it is more suitable for corrosive media at lower temperatures.

　　Finally, let's talk about Sandow rubber. This is a material suitable for acidic or alkaline corrosive media such as sodium hydroxide, sulfuric acid or hydrochloric acid. It is comparable to neoprene in terms of cost-effectiveness, but with better resistance to abrasion and durability.

　　In summary, the choice of material for diaphragm pump diaphragms should be based on specific working conditions and the nature of the medium. Rubber material is widely used in various fluid conveying occasions because of its good elasticity and corrosion resistance; EPDM rubber has become the representative of industrial rubber diaphragm with its stable chemical properties and corrosion resistance; PTFE and PFPE occupy an important position in strong corrosive media conveying with its excellent corrosion resistance; and Sandow rubber shows unique advantages in corrosive media conveying with its excellent abrasion resistance and durability. In corrosive media transportation, Sandow rubber shows unique advantages with its excellent abrasion resistance and durability.