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Performance and application introduction of commonly used sealing materials

The name of the material Code name performance feature Operating temperature (℃) Main application areas
Natural rubber NR Good abrasion resistance, high elasticity, tensile strength and elongation. But in the air easy aging, when heat become sticky, in mineral oil or gasoline easy to expand and dissolve, alkali resistance but not strong acid resistance. -50~70 It is often used as raw material for making tape, hose and strip, and suitable for making shock absorbing parts, products with hydroxide in automobile brake oil, ethanol and other liquids.
acrylonitrile-butadiene rubber NBR Good oil resistance, heat resistance, abrasion resistance, solvent resistance and high pressure oil resistance. But not suitable for polar solvents, such as ketones, ozone, nitrohydrocarbons, and chloroform. -40~120 It is often used in making fuel tank, lubricating oil box and fluid medium such as oil series hydraulic oil, gasoline, water, silicon grease, silicon oil, diester lubricating oil and glycol hydraulic oil.
Hydrogenated nitrile butadiene rubber HNBR Better wear resistance, corrosion resistance, tensile resistance, tear resistance and compression distortion than nitrile adhesive, good resistance in ozone, sunlight and other atmospheric conditions, but not recommended for use in alcohol, ester or aromatic solutions. -40~150 Commonly used in air conditioning and refrigeration industry, widely used in environmental protection refrigerant R134a system seals. Automobile engine system seals.
Silicone rubber SIL With excellent heat resistance, cold resistance, ozone resistance, resistance to atmospheric aging. Excellent electrical insulation. Poor tensile strength and abrasion resistance than ordinary rubber and not oil resistance. -55~250 Often used in the household electrical appliances industry seals or rubber parts, food machinery industry seals, or contact with the human body on all kinds of supplies such as seals.
epdm EPDM Weather resistance, aging resistance, ozone resistance, chemical stability are excellent, can withstand freon and a variety of refrigerants. -50~150 Seals used in high temperature steam environment; Seals or parts of sanitary equipment; And refrigerator and refrigeration equipment seals and so on.
Fluorine rubber FKM Excellent high temperature resistance, excellent chemical resistance, most oils and solvents (except ketones and esters). Cold resistance is not good. -20~220 It is often used in the working environment which is resistant to high temperature, chemical corrosion and oil.
Butyl rubber IIR Impermeable to most general gases, resistant to sunlight and ozone and exposed to animal or vegetable oils or oxidizable chemicals. -55~100 Often used to make chemical resistance, vacuum equipment rubber parts.
neoprene CR Good elasticity, wear resistance and air aging resistance, not afraid of severe distortion and fire resistance. Chemically stable. -40~100 Suitable for making a variety of direct contact with the atmosphere, sunlight, ozone parts; Suitable for all kinds of fire and chemical corrosion resistant rubber products.
polytetrafluoroethylene PTFE Good chemical stability, heat and cold resistance, oil, water, steam, chemicals and other media; High mechanical strength, high pressure resistance, good wear resistance; Low friction coefficient, good self-lubrication. -55~260 Used for making wear-resisting ring, guide ring and retainer ring, it is a commonly used sealing material in machinery, widely used in metallurgy, petrochemical, engineering machinery, light industrial machinery and other fields.
Polyurethane PU High strength, excellent abrasion resistance, good oil and solvent resistance, especially for lubricating oil and fuel oil have good swelling resistance, good ozone resistance. But not resistant to high temperatures. -45~110 Used for manufacturing reciprocating motion seals and seals under various wear and high strength conditions.
The fluorine rubber FFKM Excellent chemical medium and high temperature resistance, best heat resistance, chemical resistance, excellent air tightness, plasma resistance, but low temperature resistance, high raw material price, production and processing difficulty. -25~320 It can withstand all kinds of harsh chemical medium and high temperature, and is often used in semiconductor, medical, military, aerospace and other cutting-edge fields.

Comparison of various performance

pull super optimal poor bad optimal poor super
elongation super optimal optimal super bad optimal super
The elastic super optimal optimal poor poor bad super
Tear strength super optimal poor bad poor poor super
wear-resisting super super optimal bad poor super super
Impact force super optimal optimal bad poor optimal super
Air tightness poor optimal poor bad optimal super optimal
The oxidation resistance poor poor optimal super super super optimal
Resistance to ozone bad bad super super super optimal optimal
Weather resistance poor poor super super super super optimal
Resistance to the sun bad bad super super super super optimal
Heat resistant bad poor super super super optimal poor
Low temperature sex optimal poor optimal super optimal poor optimal
Oil and gas bad optimal bad poor super bad optimal
Animal and plant oil poor super optimal middle super optimal optimal
alcohol optimal optimal middle optimal optimal optimal middle
lye poor optimal optimal bad middle super bad
acid middle optimal optimal poor optimal optimal bad
Fatty oil bad super bad bad super bad optimal
Aromatic oil bad middle bad bad super bad bad
Oxidation of solvent optimal bad super poor bad super bad
Resistance to water super optimal super optimal optimal super poor

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