What are the characteristics of different diaphragm materials for Pulsation Dampener?

The selection of different diaphragm materials for Pulsation Dampener has a crucial impact on its performance and application range. The following are detailed characteristics of several common diaphragm materials: NBR (nitrile rubber), HNBR (hydrogenated nitrile rubber), IIR (butyl rubber), EPDM (ethylene propylene diene monomer rubber) and FPM (fluororubber).
NBR material has excellent oil resistance because it contains nitrile groups (-CN) in its molecular chain, and can resist the erosion of various mineral oils, animal and vegetable oils and synthetic lubricants. NBR has good wear resistance and can maintain a long service life in a friction environment. NBR material has good elasticity and flexibility and can adapt to certain deformation and pressure changes. It can usually be used in a temperature range of -40°C to 100°C, but the performance will decrease at high temperatures. It is suitable for hydraulic systems in contact with oil media, such as automobiles, construction machinery, etc., and is suitable for occasions that require a certain degree of wear resistance.
HNBR is a hydrogenated product of NBR. It has stronger oil resistance than NBR and can resist the erosion of higher concentrations of mineral oil and some synthetic oils. The high temperature resistance of HNBR is significantly improved, and it can work stably at a temperature of up to 150°C. It has good corrosion resistance to various chemical media, such as acids, alkalis, oxidants, etc. It has high tensile strength and tear strength, and is suitable for hydraulic systems in high temperature, high pressure and highly corrosive media environments, and is suitable for occasions with extremely high requirements for oil resistance and high temperature resistance.
IIR has extremely low gas permeability and is an ideal material for manufacturing airtight containers. IIR has excellent aging resistance and can be exposed outdoors for a long time without aging. It can still maintain good elasticity at a low temperature of -50°C. It has good electrical insulation properties. It is suitable for hydraulic systems that need to maintain gas sealing, such as vacuum pumps, compressors, etc., and is suitable for hydraulic systems in low temperature environments.
EPDM has excellent weather resistance and can resist erosion by natural factors such as sunlight, rain, and ozone. It has good corrosion resistance to various chemical media such as acids, alkalis, and salts. It can be used in the temperature range of -50°C to 150°C. It has good electrical insulation properties. It is suitable for outdoor hydraulic systems, such as solar water heaters, roof waterproofing, etc., and is suitable for hydraulic systems in contact with a variety of chemical media.
FPM has extremely high chemical corrosion resistance and can resist the erosion of a variety of strong acids, strong alkalis, organic solvents and other chemical media. FPM has excellent high temperature resistance and can work stably at temperatures up to 300°C. It has excellent oil resistance to a variety of mineral oils, synthetic oils and lubricating oils. It has high tensile strength and tear strength, as well as good wear resistance. It is suitable for hydraulic systems in highly corrosive media environments, such as chemical industry, pharmaceutical industry, etc. It is suitable for hydraulic systems in high temperature, high pressure and highly corrosive media environments.