The application medium of the plate heat exchanger ranges from ordinary water to high-viscosity non-bovine liquids, from materials containing small solid particles to materials rich in a few fibers, from water vapor to various gases, from non-corrosive to highly corrosive . The selection of the gasket material of the plate heat exchanger must be determined based on the operating conditions of the medium. What are the commonly used materials for plate heat exchanger gaskets?
Nitrile rubber (NBR) is a polymer formed by emulsion copolymerization of diene and acrylonitrile. Nitrile rubber has excellent oil resistance, abrasion resistance, aging resistance and air tightness. But it is not suitable for phosphate grease series hydraulic oil and gear oil containing extreme pressure additives. The formulas commonly used in the production of plate heat exchanger gaskets are N302 and N308.
Hydrogenated nitrile rubber (HNBR) is a highly saturated elastomer obtained by special hydroprocessing of nitrile rubber. Hydrogenated nitrile rubber has outstanding oil resistance (excellent resistance to fuel oil, lubricants, and aromatic solvents). Because of its highly full structure, it has outstanding heat resistance and excellent chemical resistance (excellent resistance to freon, acid and alkali). Hydrogenated nitrile rubber also has the characteristics of high strength, high tear function, and excellent wear resistance.
EPDM rubber has good aging resistance, ozone resistance, weather resistance and heat resistance. It can be used at 150℃. Good electrical insulation, low water absorption, chemical resistance, excellent water vapor resistance, and high impact elasticity. It is suitable for operation in phosphate ester-based flame-retardant liquid oil, but not suitable for mineral oil and hydraulic oil. The formulas commonly used in the production of gaskets for plate heat exchangers are OE024 and E106.