Full definition
The trade name (originally DuPont, now Denka) for polychloroprene (CR) — a versatile synthetic elastomer offering an excellent balanced combination of properties that few other rubbers can match: good weather and ozone resistance (chlorine atom provides protection), moderate oil and fuel resistance, inherent flame retardancy (self-extinguishing, oxygen index >26%), good adhesion (base for contact cements), and adequate mechanical properties. Temperature range: -35 to +100°C continuous (+120°C short term). ASTM D2000 classification: BC (general) to BE (higher temperature). Properties: hardness 30-90 Shore A, tensile 15-25 MPa, elongation 200-600%. Grades: general-purpose (W-types), adhesive grades (AC), crystallization-resistant (GN/GNA for low-temperature flexibility). Applications: power transmission belt compounds, automotive hoses and gaskets, expansion joints, bridge bearing pads (AASHTO M 251), wetsuits, contact adhesives, cable jacketing, and industrial sheet/gaskets. Limitations: poor resistance to aromatics and chlorinated solvents, moderate cost ($3-5/kg). Manufacturers: Denka (Japan), Pidilite, Lanxess (Baypren).