Series 2
Pro les & Extrusions
8
PROPERTIES OF ELASTOMERS
Properties
Chemical Name
Natural
Rubber
Polyisoprene
SBR or GR-S
or Buna S
Buladiene
styrene
Butyl
Isobutylene
isoprene
Nitrile
(Buna N)
Butadiene
acrylonitrile
Neoprene
Chloroprene
Silicone
Polysiloxane
polymer
EPDM Rubber
Ethylene
Propylene
polymer
Material Designation
(ASTM 0-2000.SAE J200
Classi cation)1981
AA AA
BA
BF,BG,BK,
CH
BC,BE
FE
BA,CA,DA
Tensile Strength
PSI
Over 3000
Over 2000
Over 2000
Over 2000
Over 3000
Below 1500
Over 2000
Hardness Range
(Durom
A)
30-90 40-90 40-75 40-95 40-95 50-80 40-90
Speci c Gravity
Polymer
0.93
0.94
0.92
1
1.23
1.14 2.05
0.86
Adhesion to Metals
Excellent
Excellent
Good
Excellent
Excellent
Excellent
Fair
Adhesion to Fabrics
Excellent
Good
Good
Good
Excellent
Excellent
Good
Tear Resistance
Very Good
Fair
Good
Fair
Good
Poor
Fair
Abrasion Resistance
Excellent
Good to
Excellent
Good
Good
Excellent
Poor
Good to Excellent
Compression Set
Good
Good
Fair
Good
Fair to Good
Fair
Good
Rebound
Cold
Excellent
Good
Poor
Good
Good
Excellent
Excellent
Hot
Excellent Good Very
Good
Good Very
Good
Excellent Excellent
Dielectric
Strength
Excellent Excellent Excellent Poor Very
Good Good Outstanding
Electrical Insulation
Good to
Excellent
Good to
Excellent
Good to
Excellent
Poor
Fair to Good
Excellent
Outstanding
Permeability to Gases
Fairly low
Fairly low
Very Low
Low
Low
Fairly Low
Fairly Low
Acid Resistance
Dilute
Fair to Good
Fair to Good
Excellent
Good
Excellent
Excellent
Excellent
Concentrated
Fair to Good
Fair to Good
Good
Good
Good
Fair
Good
Solvent Resistance
Aliphatic hydrocarbons
Poor
Poor
Poor
Excellent
Fair to Good
Poor
Poor
Aromatic
hydrocarbons
Poor Poor Poor Good Fair Poor Poor
Oxygenated (Ketones, etc)
Good
Good
Good
Poor
Poor to Fair
Fair
Excellent
Lacquer solvents
Poor
Poor
Fair to Good
Fair
Poor
Poor
Fair to Good
Resistance to
Swelling in Lubricating oil
Poor
Poor
Poor
Very Good
Good
Fair
Poor
Oil and gasoline
Poor
Poor
Poor
Excellent
Good
Fair
Poor
Animal and Vegetable oils
Poor to Good Poor to Good
Very Good
Very Good
Good
Good to
Excellent
Good to Excellent
Water absorption
Very Good
Good to very
good
Very Good
Good
Good
Excellent
Excellent
Oxidation Good
Fair
Excellent
Good
Very
Good
Excellent
Excellent
Ozone Poor
Poor
Excellent
Fair
Very
Good
Excellent
Outstanding
Sunlight
aging
Poor
Poor Very
Good Poor Very
Good
Excellent Outstanding
Heat aging
Fair
Fair to Good
Very Good
Good
Good
Outstanding
Excellent
Low temperature
Very Good
Very Good
Good
Fair to Good
Good
Outstanding
Excellent
Flame
Poor
Poor
Poor
Poor
Good
Fair to Good
Poor to Good