油封
O型圈
三角带
聚氨酯
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材质
Nitile rubber(NBR)
This elastomer is a copolymer of butadiene and acrylonitrile and is used for the majority of conventional fluid sealing application. Standard colour: black.
Advantages
good resistance to mineral oil and grease
good resistance to water and radiator fluid
Limitations
poor resistance to high-alloyed hypoid oil
poor resistance to ozone, weathering and sunlight
not resistant to automotive brake fluid (glycol based)
poor resistance to polar fluids (ketones, ethers, esters)
poor resistance to chlorinated hydrocarbons (carbon tetrachloride, trichloroethylene)
poor resistance to aromatic solvents
Fluorinated rubber(FPM)
It has good chemical resistance and is recommended for high temperature applications. Standard colour: brown .
Advantages
excellent resistance to mineral oil and above all high-alloyed hypoid oils
excellent acid resistance
good resistance to aromatic and chlorinated hydrocarbons
excellent resistance to ageing, ozone and weathering
Advantages
limited cold flexibility
poor resistance to polar fluids (ketones, ethers, esters)
Silicone rubber(SIl or MVQ)
Standard colour: red
Advantages
retains flexibility down to very low temperatures
withstands continuous heating at high temperatures without hardening
resistant to mineral oil and greases
excellent resistance to ageing, weathering and ozone
good chemical resistance to alkalis
Limitations
not recommended for use with hydrocarbons such as petrols and paraffin,and lighter mineral oil or steam over 3.5 bar
not resistant to hot water, acids and non-mineral automotive brake fluids
poor wear resistance
Polyacrylic Rubber(ACM)
Advantages
good resistance to oils and fuels
good resistance to ozone and weathering
Limitations
not resistant to water and water solutions
poor resistance to polar fluids (ketones, ethers, esters)
poor resistance to chlorinated hydrocarbons (carbon tetrachloride, trichloroethylene)
poor resistance to aromatic solvents
limited cold flexibility
poor wear resistance
Chloroprene Rubber(CR)
Advantages
excellent resistance to ageing, weathering and ozone
moderate resistance to mineral oils and greases
Limitations
tends to harden or stiffen at low temperatures
not resistance to non-mineral automotive brake fluids
Ethylene propylene rubber(EPDM)
Advantages
excellent resistance to ageing, weathering and ozone
good resistance to water and steam
good resistance to automotive brake fluid (glycol based)
good resistance to polar fluids
Limitations
poor resistance to mineral oil and grease
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