Rubber has three predominant characteristics:

  • Incompressible – Can be deformed but not reduced in volume
  • Extensible – Can be stretched
  • Impermeable – Can prevent the passage of gases through the material


Ethylene Propylene

Ethylene Propylene-Diene Terpolymer (EPDM) or Ethylene-Propylene Copolymer (EPM)

  • Resistant to animal and vegetable oils, strong and oxidizing chemicals and ozone
  • Attacked by petroleum oils and solvents, and aromatic hydrocarbons (I.E. toluene, benzene, xylene, etc.)
  • Excellent weathering properties, low temperature resistance, low permeability to air, and good dielectric strength
  • Good bonding properties (Expansion Joints)
  • Temperature limit: 300°F (149°C)




  • Generally resistant to animal and vegetable fats, strong and oxidizing chemicals
  • Resistant to ozone
  • Attacked by petroleum solvents, coal, tar solvents, and aromatics hydrocarbons
  • Good heat resistance, weather resistance, and low permeability to air
  • Standard elastomer for Garlock® expansion joints
  • Temperature limit: 250°F (121°C)



Hexafluoropropylene-Vinylidene Fluoride (FKM or FPM)

  • Most common trade names: DuPont VITON® and 3M FLUOREL®
  • Resistant to aliphatic, aromatic, and halogenated hydrocarbons, acids, animal and vegetable oils
  • Attacked by ketones, low molecular weight esters, and nitro-containing compounds
  • Good weathering properties and resistance to elevated temperatures
  • Available in several types and grades
  • Temperature limit: 400°F (205°C)




  • Excellent weather resistance – ideal expansion joint cover material for outdoor applications
  • Compatible with mild acids
  • HYPALON® is a registered trademark of DuPont Elastomers
  • Temperature limit: 250°F (121°C)


Natural Rubber


  • Generally resistant to most moderate wet or dry chemicals, organic acids, and alcohols
  • Attacked by strong acids, fats, oils, grease, most hydrocarbons, and ozone
  • Excellent physical properties including abrasion and tear resistance
  • Temperature limit: 180°F (82°C)



Chloroprene (CR)

  • Resistant to moderate chemicals, acids, oils, fats, grease, many solvents, and ozone
  • Attacked by strong oxidizing acids; esters; ketones; chlorinated, aromatic, and nitro hydrocarbons
  • Good weathering resistance
  • Flame retarding


Nitrile or Buna-N

Acrylonitrile Butadiene (NBR)

  • Generally resistant to fats, oils, greases, and aliphatic hydrocarbons
  • Not ozone resistant
  • Attacked by ketones; esters; aldehydes; and aromatic, chlorinated, and nitro hydrocarbons


SBR or Buna-S

Styrene Butadiene (SBR)

  • Fluid compatibility is similar to “Natural”
  • Good physical properties