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ROHS, SGS,FDA,OIL RESISTANCE, HIGH TEMPERTURE RESISTANCE,AND ETC



Performance and application introduction of commonly used sealing materials
 


The name of the materialCode nameperformance featureOperating temperature (℃)Main application areas
Natural rubberNRGood 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.-50~70It 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 rubberNBRGood 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.-40~120It 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 rubberHNBRBetter 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.-40~150Commonly used in air conditioning and refrigeration industry, widely used in environmental protection refrigerant R134a system seals. Automobile engine system seals.
Silicone rubberSILWith 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.-55~250Often 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.
epdmEPDMWeather resistance, aging resistance, ozone resistance, chemical stability are excellent, can withstand freon and a variety of refrigerants.-50~150Seals used in high temperature steam environment; Seals or parts of sanitary equipment; And refrigerator and refrigeration equipment seals and so on.
Fluorine rubberFKMExcellent high temperature resistance, excellent chemical resistance, most oils and solvents (except ketones and esters). Cold resistance is not good.-20~220It is often used in the working environment which is resistant to high temperature, chemical corrosion and oil.
Butyl rubberIIRImpermeable to most general gases, resistant to sunlight and ozone and exposed to animal or vegetable oils or oxidizable chemicals.-55~100Often used to make chemical resistance, vacuum equipment rubber parts.
neopreneCRGood elasticity, wear resistance and air aging resistance, not afraid of severe distortion and fire resistance. Chemically stable.-40~100Suitable 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.
polytetrafluoroethylenePTFEGood 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.-55~260Used 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.
PolyurethanePUHigh 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.-45~110Used for manufacturing reciprocating motion seals and seals under various wear and high strength conditions.
The fluorine rubberFFKMExcellent 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.-25~320It 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
 

 NRNBREPDMVMQFKMIIRPU
pullsuperoptimalpoorbadoptimalpoorsuper
elongationsuperoptimaloptimalsuperbadoptimalsuper
The elasticsuperoptimaloptimalpoorpoorbadsuper
Tear strengthsuperoptimalpoorbadpoorpoorsuper
wear-resistingsupersuperoptimalbadpoorsupersuper
Impact forcesuperoptimaloptimalbadpooroptimalsuper
Air tightnesspooroptimalpoorbadoptimalsuperoptimal
The oxidation resistancepoorpooroptimalsupersupersuperoptimal
Resistance to ozonebadbadsupersupersuperoptimaloptimal
Weather resistancepoorpoorsupersupersupersuperoptimal
Resistance to the sunbadbadsupersupersupersuperoptimal
Heat resistantbadpoorsupersupersuperoptimalpoor
Low temperature sexoptimalpooroptimalsuperoptimalpooroptimal
Oil and gasbadoptimalbadpoorsuperbadoptimal
Animal and plant oilpoorsuperoptimalmiddlesuperoptimaloptimal
alcoholoptimaloptimalmiddleoptimaloptimaloptimalmiddle
lyepooroptimaloptimalbadmiddlesuperbad
acidmiddleoptimaloptimalpooroptimaloptimalbad
Fatty oilbadsuperbadbadsuperbadoptimal
Aromatic oilbadmiddlebadbadsuperbadbad
Oxidation of solventoptimalbadsuperpoorbadsuperbad
Resistance to watersuperoptimalsuperoptimaloptimalsuperpoor

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