High Quality Custom Molded Rubber Products

Design Engineers Guide

NR – NATURAL NBR – NITRILE EPDM – ETHYLENE PROPYLENE
Good low temperature properties and long flex life. High resilience, elongation and tensile strength, and wide hardness range. Poor resistance to ozone, heat, oil and general weathering. Resistant to attack from mineral oils, petroleum solvents, fair resistance to heat and aging. Relatively poor cold resistance. Cannot be used where weather resistance is required. Excellent resistance to weather and ozone. High tensile strength. Good low temperature properties. Resistant to non-flammable hydraulic fluids (Skydrol). Non-resistant to mineral oils.
CR – NEOPRENE VMQ – SILICONE FKM – FLUOROELASTOMER
Good heat, flame, aging and weather resistance. Moderate chemical and oil resistance. Long flex life. Poor resistance to aromatic hydrocarbons. Excellent electrical properties, resistant up to very high temperatures and flexible to very low temperatures. Poor tensile and abrasion resistance compared to other elastomers. Excellent long term heat resistance and aging. Excellent hot oil, aliphatic and aromatic hydrocarbon resistance. Not very elastic. High cost polymer.
SBR URETHANE VITON
Non-oil resistant, economically priced synthetic rubber – especially noted for its low water absorption properties. Outstanding tensile and abrasion qualities – excellent resistance to wear, ozone, oxygen, kerosene & gasoline. In addition to its ability to withstand extreme temperatures, it is also fuel and oil resistant.
BUTYL EPDM HYPALON NATURAL
RUBBER
NEOPRENE
ASTM D -2000 Classification AA BA CE AA BC
Durometer 40-75 30-100 55-95 30-90 30-90
Elongation F G F E E
Heat Aging E E G G VG
Sunlight Aging G E E P G
Lubricating Oil Resistance P P G P G
Aromatic Oil Resistance P P P P F
Animal-Vegetable Oil Resistance E P G F E
Flame Resistance P P E P G
Tear Resistance G G E G G
Abrasion Resistance G G E E E
Compression Resistance F F G G F
Dielectric Strength G G G E F
Maximum Temperature 250 350 250 210 260
Minimum Temperature -50 -50 -35 -45 -50
NITRILE SILICONE SBR URETHANE FLUOROE-LASTOME
ASTM D -2000 Classification BF GE AA BG HK
Durometer 40-95 45-85 40-90 20-100 70-
Elongation G F G E G
Heat Aging E E G E E
 Sunlight Aging G E P E E
 Lubricating Oil Resistance E F P G G
Aromatic Oil Resistance G P P G G
Animal-Vegetable Oil Resistance G G F F G
 Flame Resistance P F P P G
 Tear Resistance F P F E F
 Abrasion Resistance G P G E F
 Compression Resistance G F F E G
 Direct Strength P G E F G
 Maximum Temperature 280 550 215 250 500
 Minimum Temperature -40 -150 -50 -40 -40
P = POOR F = FAIR G = GOOD VG = VERY GOOD E = EXCELLENT