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Advantages and disadvantages of ethylene propylene rubber and nitrile rubber for automobile engine system seals?

Update:03-09-2020
Summary:

Ethylene-propylene rubber EPDM is made by copolymerizat […]

Ethylene-propylene rubber EPDM is made by copolymerization of ethylene and propylene, so it has excellent heat resistance, aging resistance, ozone resistance, and stability, but it cannot be sulfurized. In order to solve this problem, a small amount is introduced into the EP main chain It has the third component of double strands and can be vulcanized to prepare EPDM. The general use temperature is -50~150 ℃. It has excellent resistance to polar solvents such as alcohols and ketones. Advantages: good weather resistance and ozone resistance. It has excellent water resistance and chemical resistance. Alcohols and ketones can be used. It is resistant to high-temperature steam and has good gas impermeability. Disadvantages: Not recommended for food use or exposure to aromatic hydrogen. Seals or parts of sanitary equipment in high temperature water vapor environment. Rubber parts in the brake (brake) system. The seal in the radiator (car radiator).

Nitrile rubber is made by copolymerization of acrylonitrile and butadiene. The acrylonitrile content is 18%~50%. The higher the acrylonitrile content, the better the resistance to petrochemical hydrocarbon fuel oil, but the low temperature performance will change. Poor, the general use temperature range is -25~100 ℃. Nitrile rubber is currently one of the most commonly used rubbers for oil seals and O-rings. Advantages: It has good resistance to oil, water, solvent and high pressure oil, and has good compressibility, wear resistance and elongation.
Disadvantages: Not suitable for use in polar solvents, such as ketones, ozone, nitro hydrocarbons, MEK and chloroform. Used to make fuel tanks, lubricating oil tanks, and in petroleum hydraulic oil, gasoline, water, silicone oil, diester series Rubber parts used in fluid media such as lubricating oil, especially sealing parts. It can be said to be the most versatile and lowest cost rubber seal at present.

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