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Materials

ButylClick for More

Common NameButyl
ASTM D-2000 Classification AA, BA
Military (MIL-STD 417) RS
Chemical Definition lsobutylene lsopreneGeneral Characteristics
Durometer Range (Shore A) 40-90
Tensile Range (P.S.I.) 500-3000
Elongation (Max%) 850
Compression Set Fair to Good
Resilience-Rebound Fair
Abrasion Resistance Fair
Tear Resistance Good
Solvent Resistance Poor
Oil Resistance Poor
Low Temperature Usage (°F) -10° to -60°
High Temperature Usage (°F) to 250°
Aging Weather-Sunlight Excellent
Adhesion to Metals Good

Comments
Butyl rubber is impermeable to most common gasses and has good resistance to sunlight and ozone. Butyl is normally satisfactory when exposed to animal and vegetable oils and oxidizing chemicals. Butyl is not recommended for use with petroleum solvent, coal tar, and aromatic hydrocarbons.

EPRClick for More

Common Name EPR, EPT, EPDM
ASTM D-2000 Classification CA
Military(MIL-STD417) RS
Chemical Definition Ethylene PropyleneGeneral Characteristics
Durometer Range (Shore A) 30-90
Tensile Range (P.S.I.) 500-2500
Elongation (Max%) 600
Compression Set Good
Resilience-Rebound Good
Abrasion Resistance Good
Tear Resistance Fair
Solvent Resistance Poor
Oil Resistance Poor
Low Temperature Usage (° F) -20° to -60°
High Temperature Usage (°F) to 350°
Aging Weather-Sunlight Excellent
Adhesion to Metals Fair to Good

Comments
Ethylene Propylene is a polymer with outstanding properties. It has exceptionally good weather aging and ozone resistance; excellent water and chemical resistance; excellent resistance to gas permeability, and excellent resistance to aging due to exposure to steam; and heat, resistance excellent up to 350° F. Ethylene Propylene is a polymer where oil and solvent resistance is poor, however, it is fairly good in ketones and alcohols. It is not recommended for food applications or exposure to aromatic hydrocarbons.

Buna-NClick for More

Common Name Buna N, Nitrile, NBR
ASTM D-2000 Classification BF, BG, BK
Military (MIL-STD417) SB
Chemical Definition Butadiene AcrylonitrileGeneral Characteristics
Durometer Range (Shore A) 20-95
Tensile Range (P.S.1.) 200-3000
Elongation (Max%) 600
Compression Set Good
Resilience-Rebound Good
Abrasion Resistance Excellent
Tear Resistance Good
Solvent Resistance Good to Excellent
Oil Resistance Good to Excellent
Low Temperature Usage (°F) +30° to -40°
High Temperature Usage (° F) to250°
Aging Weather-Sunlight Poor
Adhesion to Metals Good to Excellent

Comments
Nitrile (Buna-N) is a general purpose oil resistant polymer which has good solvent, oil, water, and hydraulic fluid resistance, good compression set, abrasion resistance and tensile-strength. Nitrile should not be used in highly polar solvents such as acetone, and MEK, ozone, chlorinated hydrocarbons, and nitre hydrocarbons.

Natural RubberClick for More

Common Name Natural Rubber
ASTM D-2000 Classification AA
Military(MIL-STD417) RN
Chemical Definition PolyisopreneGeneral Characteristics
Durometer Range (Shore A) 20-100
Tensile Range (P.S.I.) 500-3500
Elongation (Max%) 700
Compression Set Excellent
Resilience-Rebound Excellent
Abrasion Resistance Excellent
Tear Resistance Excellent
Solvent Resistance Poor
Oil Resistance Poor
Low Temperature Usage (0 F) -20° to -60°
High Temperature Usage (° F) to 175°
Aging Weather-Sunlight Poor
Adhesion to Metals Excellent

Comments
Natural Rubber has many good characteristics. It has high resilience, good compression set, food roll building behavior, and molding properties; very good friction surface, but not a fine smooth surface when ground; high tear strength; low crack growth; usable for ketones and alcohol; and good low temperature properties. Natural Rubber is not recommended for oil and solvent resistance and ozone attacks it.

NeopreneClick for More

Common Name Neoprene®
ASTM D-2000 Classification BC, BE
Military (MIL-STD 417) SC
Chemical Definition PolychloropreneGeneral Characteristics
Durometer Range (Shore A) 20-95
Tensile Range (P.S.I.) 500-3000
Elongation (Max%) 600
Compression Set Good
Resilience-Rebound Excellent
Abrasion Resistance Excellent
Tear Resistance Good
Solvent Resistance Fair
Oil Resistance Fair
Low Temperature Usage (° F) + 10° to -50°
High Temperature Usage (° F) to 250°

Comments
Neoprene is an all-purpose polymer with many desirable characteristics. It has additional plus features: high resilience with low compression set; flame resistant; compounds free of Sulphur are easily made; and animal and vegetable oil resistant, generally not affected by moderate chemicals, fats, greases, and many oils and solvents. Neoprene is generally attacked by strong oxidizing acids, esters, ketones, chlorinated aromatic and nitre hydrocarbons.

SBRClick for More

Common NameSBR, GRS
ASTM D-2000 Classification AA, BA
Military (MIL-STD 417) RS
Chemical Definition Styrene ButadieneGeneral Characteristics
Durometer Range (Shore A) 30-100
Tensile Range (P.S.I.) 500-3000
Elongation (Max%) 600
Compression Set Good
Resilience-Rebound Good
Abrasion Resistance Excellent
Tear Resistance Fair
Solvent Resistance Poor
Oil Resistance Poor
Low Temperature Usage (° F) 0° to -50°
High Temperature Usage (° F) to 225°
Aging Weather-Sunlight Poor
Adhesion to Metals Excellent

Comments
SBA is a low cost non-oil resistant material. It has good water resistance and resilience up to 70 durometer; compression set becomes poorer with higher durometer; generally satisfactory for most moderate chemicals and wet or dry organic acids. SBR is not recommended for ozone, strong acids, oils, greases, fats, and most hydrocarbons.

SiliconeClick for More

Common NameSilicone
ASTM D-2000 Classification FC, FE, GE
Military (MIL-STD 417) TA
Chemical Definition PolysiloxaneGeneral Characteristics
Durometer Range (Shore A) 30-90
Tensile Range (P.S.I.) 200-1500
Elongation (Max%) 700
Compression Set Good
Resilience-Rebound Good
Abrasion Resistance Fair to Poor
Tear Resistance Poor
Solvent Resistance Poor
Oil Resistance Fair to Poor
Low Temperature Usage (0 F) -60° to 150°
High Temperature Usage (° F)to 450°
Aging Weather-SunlightExcellent
Adhesion to Metals Good

Comments
Silicone Rubber has a great many variations and can be compounded to meet any number of applications. Silicone can be compounded to have tensile in the area of 1500 PSI and tear up to 200 lbs; low compression set and good resilience; moderate solvent resistance; excellent heat resistance; good release characteristics; extreme low temperature properties; and can be highly resistant to oxidation and ozone attack. Silicone is generally attacked by most concentrated solvents, oils, concentrated acids, and dilute sodium hydroxide.