Full definition
Synthetic rubber is a category of elastomers manufactured through the chemical polymerization of petroleum-derived monomers, distinguishing it from natural rubber sourced from the Hevea brasiliensis tree. With global production figures approximating 15 million tonnes annually, synthetic rubber accounts for nearly half of the total rubber supply worldwide. Its development has been crucial to meet specific performance criteria that natural rubber cannot address effectively. Each type of synthetic rubber is designed with particular properties that suit various industrial applications, making them essential in sectors such as automotive, construction, and consumer goods.
The major types of synthetic rubber include Styrene-Butadiene Rubber (SBR), which is known for its cost-effectiveness and versatility, making it ideal for various general-purpose applications. Polybutadiene Rubber (BR) offers exceptional resilience, predominantly utilized in tire treads due to its ability to withstand wear and tear. Nitrile Butadiene Rubber (NBR) is famous for its oil resistance, making it an excellent choice for seals and gaskets. Ethylene Propylene Diene Monomer (EPDM) exhibits outstanding resistance to weather, ozone, and steam, frequently used in roofing and automotive seals. Neoprene (CR) combines balanced properties, including flame resistance, making it suitable for a wide range of applications from wetsuits to industrial adhesives.
Other specialized types include Butyl Rubber (IIR), known for its gas impermeability and vibration dampening capabilities, and Fluoroelastomer (FKM), which withstands high temperatures and chemical exposure. Silicone rubber (VMQ) can endure extreme temperature ranges, making it ideal for seals in high-temperature environments. Finally, Polyurethane (PU) boasts the highest abrasion and mechanical strength, utilized in applications requiring durability and resilience. The production methods for synthetic rubber involve different processes, including emulsion, solution, and gas-phase polymerization, each chosen based on the desired properties and performance metrics of the final product. The nomenclature and classification of these rubber types are standardized under ASTM D1418, ensuring consistency across the industry.