CP stands for Chlorosulfonated Polyethylene, a synthetic elastomer used for cable insulation and jacketing. Known for its flexibility, flame resistance, and environmental durability, CP is also commonly referred to as CSPE.
Chlorosulfonated Polyethylene (CP or CSPE) is a chemically modified form of polyethylene created by introducing chlorine and sulfonyl groups into its polymer structure. This process gives the material exceptional resistance to ozone, UV radiation, chemicals, and weathering. Its combination of toughness, flexibility, and chemical stability makes it a reliable choice for demanding commercial and industrial applications.
In wire and cable construction, CP serves as both an insulating and jacketing material, providing protection against abrasion, heat, and chemical exposure. It maintains its mechanical strength across a wide temperature range and delivers consistent dielectric performance, making it suitable for use in control, instrumentation, and power cables. Because it resists degradation from oils, solvents, and sunlight, CP is widely used in manufacturing facilities, transportation systems, and outdoor installations.
Originally developed under DuPont’s Hypalon trademark, CP remains a standard compound in modern cable design. Its ability to withstand environmental and mechanical stress while retaining electrical stability makes it an enduring material for high-performance, long-life cabling solutions.
Cables constructed with CP insulation or jackets are certified under standards from UL (Underwriters Laboratories), CSA (Canadian Standards Association), and ASTM (American Society for Testing and Materials). These organizations set requirements for flame resistance, temperature rating, and chemical durability to ensure cable safety and performance.
Chlorosulfonated Polyethylene was introduced by DuPont in the mid-20th century under the brand name Hypalon. Designed as an improvement over natural rubber and neoprene, it offered superior resistance to weathering and chemicals. Although DuPont ended Hypalon production in 2010, CP continues to be produced globally and remains an important material for high-performance wire and cable products.