California Gasket and Rubber Corporation
Polymer Type   Natural Rubber Butyl SBR EPR/EPDM Neoprene Buna N, Nitrile Urethane Hypalon Acrylic Hydrin Fluorosilicone Silicone Viton, Fluorel  
Polymer Name   Polyisoprene Isobutylene-isoprene Styrene Butadiene Ethylene Propylene Polychloroprene Acrilonitrile Butadiene Polyurethane Chlorosulfonated polyethylene Acrylic Epichlorohydrin Fluorinated polysiloxane Polysiloxane Fluoroelastomer  
ASTM D-2000 Classification   AA AA AA BA BC BG, BF, BK BG CE DF, DH DK, DJ FK GE HK  
Durometer   30-90 40-75 40-90 30-90 30-85 40-95 20-100 55-95 50-90 40-90 40-80 25-80 45-90  
Elongation   Xlnt Fair Good Good Xlnt Good Xlnt Fair Fair Good Fair Fair Good  
Tear Resistance   Good Good Fair Good Good Fair Xlnt Xlnt Fair Xlnt Poor Poor Fair  
Abrasion Resistance   Xlnt Good Good Good Xlnt Good Xlnt Xlnt Good Good Poor Poor Fair  
Compression Set Resistance   Good Fair Fair Fair Fair Xlnt Xlnt Good Fair Fair Fair Good Good  
Heat Aging   Good Xlnt Good Xlnt Very Good Xlnt Xlnt Good Xlnt Good Xlnt Xlnt Xlnt  
Sunlight Resistance   Poor Good Poor Xlnt Good Good Xlnt Xlnt Xlnt Good Xlnt Xlnt Xlnt  
Lubricating Oil Resistance   Poor Good Poor Poor Good Xlnt Good Good Xlnt Xlnt Xlnt Fair Good  
Aromatic Oil Resistance   Poor Poor Poor Poor Fair Good Good Poor Good Good Good Poor Good  
Animal/Vegetable Oil Resistance   Fair Xlnt Fair Poor Xlnt Good Fair Good Good Good Good Good Good  
Flame Resistance   Poor Poor Poor Poor Good Poor Poor Xlnt Poor Poor Fair Fair Good  
Dielectric Strength   Xlnt Good Xlnt Good Fair Poor Fair Good Fair Good Good Good Good  
Freedom From Odor   Xlnt Good Fair Good Good Fair Fair Xlnt Fair Fair Good Good Fair  
Maximum Temperature (F)   210 250 215 300 260 260 250 250 375 325 450 550 500  
Minimum Temperature (F)   -45 -50 -50 -50 -50 -40 -40 -35 -20 -55 -81 -150 -40  
NATURAL RUBBER Extremely Resilient with high tensile strength and elongation.  Also resistant to flexing and permanent set.  Widely used for seals in food and beverage applications.
BUTYL Extremely low permeability.  Excellent where low outgassing is needed.  Also extremely low resilience.
SBR Not oil resistant.  Low water absorption properties.
EPR/EPDM Not oil resistant.  Low water absorption properties. Excellent choice for outdoor weather resistance.  Highly resistant to acids, alkalis, water.
NEOPRENE Moderate oil resistance.  Good all purpose material for indoor and outdoor use.
NITRILE Good oil resistance.  Especially resistant to aromatic hydrocarbons, gasoline, petroleum, vegetable and mineral oils.
URETHANE Outstanding tensile and abrasion qualities.  Excellent resistance to wear, ozone, oxygen, kerosene and gasoline
HYPALON Highly resistant to abrasion, tear and sunlight.  Widely used for electrical cable jacketing.
ACRYLIC Outstanding resistance to heat and hot oil; excellent weathering resistance.  Inferior resistance to water and steam.
HYDRIN Good resistance to oils and gasoline.  Superior impermeability to gasses and vapor.  Very good weathering resistance.
SILICONE Outstanding resistance to high heat.  Excellent flexibility at low temperatures.  Excellent weathering resistance.  Poor resistance to abrasion, tear and cut growth.
FLUOROSILICONE Excellent fluid resistance to most hydrocarbon and silicone fluids, fuels oils and solvents.  Not suitable for ketones and phosphate esters.
FLUOROELATOMER Excellent high temperature resistance, but poor at low temperatures.  Also resistant to fuel, oil acids and alkalis.