Neoprene Rubber

What is Neoprene Rubber?

Neoprene Rubber or Polychloroprene (CR) is a versatile synthetic rubber with exceptional resistance to oil, petroleum, and weathering. It also offers good UV, ozone and chemical stability; flexibility over a wide temperature range, and superior abrasion resistance. Neoprene is often found in laptop sleeves, electrical insulation, automotive fan belts, and various other industries and applications.

Neoprene production involves the free-radical polymerization of chloroprene. In commercial production, however, it is prepared by free-radical emulsion polymerization. Chloroprene polymerization is initiated with potassium persulfate. Bifunctional nucleophiles, metal oxides, and thioureas are then used to cross-link individual polymer strands.

Although natural rubber offers better mechanical properties, Neoprene’s resistance to degradation is far better than both natural and synthetic rubber. As a result, it is ideal for particularly demanding applications: gaskets, hoses, tubing, corrosion-resistant coatings.

Advantages of Neoprene Rubber

  • Exceptional physical toughness
  • Heat resistance
  • Hydrocarbon oil resistance
  • Sun, ozone and weathering resistance
  • Wide temperature range for continuous use
  • Superior flame retardant properties relative to hydrocarbon-based elastomers
  • Resistance to twisting and flexing damage
  • Versatile compounding capabilities

Properties of Neoprene Rubber

  • ASTM D-2000 Classification BC, BE (Standard Classification System for Rubber Products in Automotive Applications)
  • Chemical Definition: Polychloroprene
  • Abbreviations: CR


  • Transfer Molding
  • Injection Molding
  • Compression Molding

Physical & Mechanical Properties

  • Durometer: 20 – 95 Shore A
  • Tensile Strength: 500 – 3,000 PSI
  • Elongation (Range %): 100% – 800%
  • Abrasion Resistance: Very Good – Excellent
  • Adhesion to Metal: Excellent
  • Adhesion to Rigid Materials: Good – Excellent
  • Compression Set: Poor – Good
  • Flex Cracking Resistance: Good
  • Impact Resistance: Good – Excellent
  • Resilience & Rebound: Fair – Good
  • Tear Resistance: Good – Excellent
  • Vibration Dampening: Good – Excellent

Chemical Resistance

  • Dilute Acids: Excellent
  • Concentrated Acids: Poor
  • Organic Acids (Dilute): Good – Excellent
  • Organic Acids (Concentrated): Poor – Good
  • Inorganic Acids: Good – Excellent
  • Alcohols: Excellent
  • Aldehydes: Poor – Fair
  • Dilute Alkalies: Good
  • Concentrated Alkalies: Poor
  • Amines: Poor – Good
  • Animal & Vegetable Oils: Good
  • Non-Petroleum Brake Fluids: Fair
  • Diester Oils: Poor
  • Alkyl Phosphate Esters: Poor
  • Aryl Phosphate Esters: Poor – Fair
  • Ethers: Poor
  • Aliphatic Hydrocarbon Fuels: Poor – Good
  • Aromatic Hydrocarbon Fuels: Poor – Fair
  • Extended Fuels (Oxygenated): Fair
  • Halogenated Solvents: Poor
  • Halogenated Hydrocarbon: Poor
  • Ketones: Poor – Fair
  • Lacquer Solvents: Poor
  • LP Gases & Fuel Oils: Good
  • Mineral Oils: Fair – Good
  • Oil Resistance: Fair
  • Aromatic Petroleum: Good
  • Non-Aromatic  Petroleum: Good
  • Ammonia Refrigerant: Excellent
  • Refrigerant Halofluorocarbons: R-11, R-12, R-13, R-21, R-22
  • Refrigerant Halofluorocarbons with Oil: R-11, R-12, R-22
  • Silicone Oil: Fair – Excellent
  • Solvent Resistance: Fair

Thermal Properties

  • Low Temperature Range: -70ºF – -30ºF
  • Minimum for Continuous Use (Static): -80ºF
  • Brittle Point: -85ºF
  • High Temperature Range: +200ºF – +250ºF
  • Maximum for Continuous Use (Static): +250ºF

Environmental Performance

  • Colorability: Fair
  • Flame Resistance: Fair – Good
  • Gas Permeability: Fair – Good
  • Odor: Fair – Good
  • Ozone Resistance: Good – Excellent
  • Oxidation Resistance: Good – Excellent
  • Radiation Resistance: Fair – Good
  • Steam Resistance: Fair – Good
  • Sunlight Resistance: Good – Excellent
  • Taste Retention: Fair – Good
  • Weather Resistance: Fair – Good
  • Water Resistance: Fair – Good

Applications of Neoprene Rubber

Neoprene rubber is a versatile synthetic rubber often used in a wide variety of industries and applications:

  • Automotive: Transmission belts, brake and steering system components, vibration mounts
  • Construction: Window seals and gaskets, highway and bridge seals, washers
  • Music: Speaker Cones, Piano hammer tips
  • Home accessories: Laptop sleeves, remote controls, mouse pads
  • Civil Engineering
  • Aquatics
  • Mass Transit
  • Conveyer belts
  • Industrial hoses
  • O-rings
  • Diaphragms
  • Grommets
What We Do!

Comdaco offers over 55 years of experience in many manufacturing disciplines.