Full definition
Neoprene, known as polychloroprene (CR), is a synthetic elastomer that was originally developed by DuPont and is now produced by Denka among others. This material is notable for its unique combination of properties that make it suitable for a wide range of industrial applications. Neoprene exhibits excellent weather and ozone resistance due to the presence of chlorine atoms in its molecular structure, which provides enhanced durability against environmental factors. Additionally, it has moderate resistance to oil and fuel, making it a practical choice for applications where exposure to hydrocarbons is expected. Furthermore, neoprene is inherently flame-retardant with a self-extinguishing capability, characterized by an oxygen index greater than 26%, which is crucial for safety in many applications.
The operational temperature range of neoprene extends from -35°C to +100°C for continuous use, with the ability to withstand short-term exposure up to 120°C. This broad thermal range allows it to perform effectively in diverse environments. According to ASTM D2000, neoprene is classified from BC (general-purpose) to BE (higher temperature applications), indicating its versatility across various industrial needs. The material's hardness typically ranges from 30 to 90 Shore A, with tensile strength between 15 to 25 MPa and an elongation at break of 200% to 600%, showcasing its outstanding flexibility and mechanical resilience.
Neoprene is available in different grades, including general-purpose W-types, adhesive grades AC, and low-temperature flexibility grades GN/GNA. These variations cater to specific requirements in sectors such as automotive, where neoprene is commonly used to manufacture hoses and gaskets, or in power transmission, where it serves as a component in belt compounds. It is also widely utilized in products like wetsuits, contact adhesives, and industrial sheets/gaskets. Despite its numerous advantages, neoprene has limitations, particularly its poor resistance to aromatics and chlorinated solvents, along with a moderate cost, generally ranging from $3 to $5 per kilogram. Overall, neoprene's balanced performance across multiple fronts makes it a go-to material in many industrial applications, including those demanding robust mechanical and thermal properties.