Design Engineers Guide

NR – NATURALNBR – NITRILEEPDM – 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 – NEOPRENEVMQ – SILICONEFKM – 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.
SBRURETHANEVITON
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.
BUTYLEPDMHYPALONNATURAL RUBBERNEOPRENE
ASTM D -2000 ClassificationAABACEAABC
Durometer40-7530-10055-9530-9030-90
ElongationFGFEE
Heat AgingEEGGVG
Sunlight AgingGEEPG
Lubricating Oil ResistancePPGPG
Aromatic Oil ResistancePPPPF
Animal-Vegetable Oil ResistanceEPGFE
Flame ResistancePPEPG
Tear ResistanceGGEGG
Abrasion ResistanceGGEEE
Compression ResistanceFFGGF
Dielectric StrengthGGGEF
Maximum Temperature250350250210260
Minimum Temperature-50-50-35-45-50
NITRILESILICONESBRURETHANEFLUOROE-LASTOME
ASTM D -2000 ClassificationBFGEAABGHK
Durometer40-9545-8540-9020-10070-
ElongationGFGEG
Heat AgingEEGEE
Sunlight AgingGEPEE
Lubricating Oil ResistanceEFPGG
Aromatic Oil ResistanceGPPGG
Animal-Vegetable Oil ResistanceGGFFG
Flame ResistancePFPPG
Tear ResistanceFPFEF
Abrasion ResistanceGPGEF
Compression ResistanceGFFEG
Direct StrengthPGEFG
Maximum Temperature280550215250500
Minimum Temperature-40-150-50-40-40
P = POORF = FAIRG = GOODVG = VERY GOODE = EXCELLENT