Rubber raw material

HNBR (HYDROGENATED NITRILE)
Similar to Nitrile but with improvements in heat and ozone resistance
Can be formulated for low temperature applications
Excellent for oil field service
Usually not recommended in applications with concentrated acids or alkalis
Very high cost
Maximum continuous operating temperature is about 350°F
STYRENE BUTADIENE (SBR)
Originally developed as a low cost substitute for natural rubber
Good water resistance and abrasion resistance
Poor weathering resistance, but can overcome with specific raw materials
Not recommended for contact with oils and solvents
Not used with concentrated acids or alkalis
Maximum continuous operating temperature is about 225°F
BUTYL
Very good resistance to most gases including air
highly resistant to ozone and weathering
Abrasion resistance close to natural rubber and good for concentrated acids and alkalis
Not recommended for petroleum product exposure
Maximum continuous operating temperature is about 300°F
EPDM
Exceptional resistance to weathering and ozone
Excellent resistance to water, most gases, steam, and heat aging
Good for exposure to concentrated acids and alkalies, but not recommended for exposure to oils and solvents
Maximum continuous operating temperature is about 350°F
FKM (VITON®)
High cost, but high performance material
Outstanding resistance to most chemicals, oils and solvents
Good oxidation and ozone resistance
Maximum continuous operating temperature is about 650°F
"Viton" is a trademark of DuPont and signifies material produced by DuPont
AFLAS
Similar to FKM, but with improved steam aging resistance
Lower overall temperature resistance
Very costly and seldom used except in very specific oil field applications
Maximum continuous operating temperature is about 450°F