Full definition
The chemical/ISO name for the synthetic elastomer produced by polymerization of 2-chloro-1,3-butadiene (chloroprene monomer), commonly known by the trade name Neoprene (originally DuPont, 1932 — the first commercially successful synthetic rubber). The chlorine atom on the polymer backbone (~36% Cl by weight) is responsible for CR's distinctive property combination: moderate oil/fuel resistance (better than NR/SBR/EPDM), inherent flame retardancy (self-extinguishing, LOI 26-32%), good ozone and weathering resistance, and excellent adhesive properties. Temperature range: -35 to +100°C continuous (+120°C intermittent). ASTM D2000 classification: BC (standard), BE (premium). Properties: hardness 30-90 Shore A, tensile 15-25 MPa, elongation 200-600%, good dynamic fatigue life. Polymer types: W (general purpose, sulfur-modified), GN/GNA (crystallization-resistant for low-temperature), and AC (adhesive grade). Applications span virtually every industry: belts, hoses, gaskets, seals, expansion joints, bridge bearings, wetsuits, cable jackets, contact adhesives, and protective sheet/rolls. Global production: ~400,000 tonnes/year. Manufacturers: Denka (Japan — largest), Pidilite (India), Lanxess (Germany — Baypren brand).