Urethane produced parts will in most cases outperform natural and synthetic rubbers. The composition and materials of urethane are of higher grades and are able to withstand a much broader range of extreme properties. It is important to remember that urethane can be more expensive in material costs but less expensive to manufacture. Urethane will in most cases outlast natural and synthetic rubbers and that should be taken into consideration when purchasing high quality urethane products from Acrotech Inc.

PROPERTIES NATURAL RUBBER SBR or BUNA S BUTYL NITRILE (BUNA N) NEOPRENE URETHANE
butadiene styrene isobutylene isoprene butadiene acrylonitrile chloroprene
Tensile Strength, (PSI) Pure Gum Over 3000 Below 1000 Over 1500 Below 1000 Over 3000 1000 – 10,000
Hardness Range (Durometer A) 30-90 40-90 40-75 40-95 40-95 33-95 + (75 shore D)
Specific Gravity (base material) 0.93 0.94 0.92 1.00 1.23 1.10
Vulcanizing Properties Excellent Excellent Good Excellent Excellent Excellent
Adhesion to Metals Excellent Excellent Good Excellent Excellent Excellent
Adhesion to Fabrics Excellent Good Good Good Excellent Excellent
Tear Resistance Good Fair Good Fair Good Outstanding
Abrasion Resistance Excellent Good to Excellent Good Good Excellent Outstanding
Compression Set Good Good Fair Good Fair to Good Good
Compression Set Cold Excellent Good Bad Good Very Good Fair
Rebound Hot Excellent Good Very Good Good Very Good Good
Electric Strength Excellent Excellent Excellent Poor Good Excellent
Electrical Insulation Good to Excellent Good to Excellent Good to Excellent Poor Fair to Good Fair to Good
Permeablity to Gases Fair Fair Very Low Fair Low Fair to Good
Acid Resistance: Dilute Fair to Good Fair Excellent Good Excellent Fair to Good
Concentrated Fair to Good Fair to Good Excellent Good Good Poor
Solvent Resistance: Aliphatic Hydrocarbons Poor Poor Poor Excellent Good Excellent
Aromatic Hydrocarbons Poor Poor Poor Good Fair Fair to Good
Oxygenated (ketones, etc.) Good Good Good Poor Poor Poor
Lacquer Solvents Poor Poor Poor Fair Poor Poor
Swelling in Lubricating Oil Poor Poor Poor Very Good Good Excellent
Oil & Gasoline Poor Poor Poor Excellent Good Excellent
Animal & vegetable Oils Poor to Good Poor to Good Excellent Excellent Good
Water Absorption Very Good Good to Excellent Very Good Fair to Good Good Good @ room temp., Poor @ 212º F.
Resistance to: Ozone Fair Fair Excellent Fair Excellent Outstanding
Sunlight Aging Poor Poor Very Good Poor Very Good Good
Heat Aging Good Very Good Excellent Excellent Excellent Good
Flame Poor Poor Poor Poor Good Fair
Heat Good Excellent Excellent Excellent Excellent Good
Cold Excellent Excellent Good Good Good Excellent
Oxidation Good Good Excellent Good Excellent Excellent
urethane rubber replacement