Full definition
Polychloroprene, commonly referred to as Neoprene, is a synthetic rubber created through the polymerization of 2-chloro-1,3-butadiene, a monomer that gives the material its unique properties. Developed by DuPont in 1932, Neoprene was the first commercially successful synthetic rubber and has since become a staple in various industries. The polymer backbone contains approximately 36% chlorine by weight, which significantly contributes to its diverse range of applications and performance characteristics. Neoprene exhibits excellent oil and fuel resistance, making it preferable over natural rubber (NR), styrene-butadiene rubber (SBR), and ethylene propylene diene monomer (EPDM) in environments where exposure to hydrocarbons is common. Additionally, its inherent flame retardancy, with a Limiting Oxygen Index (LOI) between 26-32%, ensures safer use in applications subjected to high temperatures or potential fire hazards.
The material's temperature resistance is notable as well, functioning continuously between -35°C and +100°C, and can withstand intermittent temperatures as high as +120°C. Its mechanical properties are also impressive, with a hardness range of 30-90 Shore A, tensile strength averaging between 15-25 MPa, and an elongation capability of 200-600%. These attributes make Neoprene suitable for dynamic applications where fatigue resistance is crucial. The ASTM D2000 classification for Neoprene includes BC for standard grades and BE for premium grades, indicating its versatility and reliability.
Neoprene is utilized broadly across multiple sectors, including automotive, aerospace, construction, and consumer goods. Common applications include belts, hoses, gaskets, seals, expansion joints, bridge bearings, and wetsuits. It also serves as a key material in contact adhesives and protective sheets or rolls. The global production of Neoprene is approximately 400,000 tonnes per year, with major manufacturers such as Denka from Japan, the largest producer, followed by Pidilite in India and Lanxess in Germany, known for its Baypren brand. This widespread availability and variety of formulations underscore Neoprene's importance in industrial applications and product development.