One
of the most important components of
the seal is the elastomer material.
We have developed elastomer blends to
meet a wide variety of sealing requirements.
Available are many classes of materials
with individual formulas to satisfy
various sealing conditions. The data
below provides general information and
fluid compatibility ratings.
Nitrile
Polyacrylate
Silicone
Fluoroelastomer
Temperature
Range*
-50°F ~ 250°F
-45°C ~ 125°C
-20°F ~ 300°F
-30°C ~ 150°C
-80°F ~ 400°F
-60°C ~ 200°C
-30°F ~ 400°F
-35°C ~ 200°C
oil Resistance
VG
VG
G
VG
Acid Resistance
G
F
F
F
Alkali Resistance
G
NR
NR
F
Water Resistance
G
F
G
G
Heat Resistance
G
VG
VG
VG
Cold Resistance
G
F
G
F
Wear Resistance
VG
VG
G
VG
Ozone Resistance
G
VG
VG
VG
*
Maximum temperature limits dependent
on other operating conditions. VG - Very good
G - Good for most applications
F - Fair, can be used if no other materials
available but otherwise not recommended
NR - Not recommended
•Polymerised acrylic
acidesters
•Good resistance to mineral
oils,
hypoid gear oils, E.P.
additives, greases, aging and
flex cracking
•Higher temperature limit than
Nitrile
•Fair cold temperature
limit
•Lower mechanical strength
•Costs slightly higher than
Nitrile
•Poor dry running ability, water
resistance
Silicone
(VMQ)
•Good Heat resistance
•Good ozone resistance
•Resistant to compression set
•Low resistance
to hydrocarbon fluids like gasoline
or paraffin fluids or steam
above 50 psi
•Cost is higher than Polyacrylate
Fluoroelastomer
Viton (FKM)
•Good temperature
resistance
•Compatible with wide range
of fluids
•Commonly chosen as high temperature
replacement of Nitrile or Polyacrylate
•Fair resistance
to water, dry running
•Low temperature resistance
is fair
•Cost is high
