CSPE stands for Chlorosulfonated Polyethylene, a durable synthetic rubber compound used for cable insulation and jacketing. It offers exceptional resistance to heat, chemicals, ozone, and environmental stress, making it ideal for demanding commercial and industrial applications.
Chlorosulfonated Polyethylene (CSPE) is a high-performance elastomer that combines the flexibility of polyethylene with superior resistance to environmental and mechanical stress. The material is created by modifying polyethylene through chlorination and sulfonation, introducing chlorine and sulfonyl groups into the polymer structure. This results in enhanced durability, excellent dielectric strength, and outstanding resistance to UV radiation, weathering, and chemicals.
In wire and cable design, CSPE is commonly used as a jacketing material for power, control, and instrumentation cables operating in harsh or fluctuating environments. It withstands high temperatures, resists flame propagation, and maintains flexibility over extended use. Its strong performance against oil, ozone, and abrasion makes it suitable for outdoor and industrial installations, including manufacturing facilities, power plants, and infrastructure exposed to chemical agents or sunlight.
Historically, CSPE was sold under the DuPont trade name Hypalon, which became synonymous with durability and weather resistance. Although Hypalon production has ceased, CSPE remains a trusted material in modern cable engineering for long-term performance and safety.
Cables using CSPE insulation or jacketing are typically certified under UL (Underwriters Laboratories), CSA (Canadian Standards Association), and ASTM (American Society for Testing and Materials) standards. These organizations regulate thermal performance, flame resistance, and dielectric strength for safety and reliability in industrial wiring applications.
Developed in the mid-20th century, CSPE was introduced by DuPont as Hypalon to replace natural rubber and PVC in high-performance environments. Its ability to resist heat, UV light, and chemical degradation made it a staple material for cable jacketing and industrial coatings. Even after Hypalon production ended, alternative CSPE formulations continued to serve the wire and cable industry due to their proven longevity and resilience.