CR, or Chloroprene Rubber, is a synthetic rubber produced from chloroprene monomer (C4H5Cl) through a polymerization process. It is widely known by its trade name “Neoprene,” first developed by DuPont in 1930.

Physical and Chemical Properties

• Oil Resistance: Moderate resistance to petroleum oils (better than NR and SBR but inferior to NBR)

• Ozone & Weather Resistance: Excellent, suitable for outdoor applications

• Heat Resistance: Continuous use at about 100–120°C and cold resistance down to -35°C

• Chemical Resistance: Good resistance to mild acids, alkalis, and various chemicals

• Mechanical Strength: High tensile strength and good tear resistance

• Flame Retardancy: Self-extinguishing due to chlorine atoms in its molecular structure

• Gas Permeability: Lower than natural rubber, providing better gas retention

Applications

• Seals and gaskets

• Conveyor belts

• Industrial rubber hoses

• Wetsuits and cold-protection gear

• Cable sheathing

• Construction materials such as waterproof membranes

Advantages Compared to Other Synthetic Rubbers

• Better ozone and weather resistance than SBR and BR

• Better oil resistance than NR and SBR

• More affordable than FKM or HNBR but more expensive than SBR

• Naturally flame-retardant without additional flame-retardant additives