Chlorosulfonated Polyethylene (CSPE) is a durable synthetic rubber compound known for its exceptional resistance to ozone, sunlight, heat, weathering, and chemicals. It is rated for continuous operation at 90°C and is commonly recognized by its former trade name Hypalon®, developed by DuPont de Nemours Co.
Chlorosulfonated Polyethylene (CSPE) is a chemically modified form of polyethylene that contains chlorine and sulfonyl chloride groups within its polymer structure. These chemical modifications significantly enhance the material’s resistance to oxidation, UV radiation, and chemical degradation, enabling it to perform reliably in harsh industrial and outdoor environments. The compound retains its flexibility, tensile strength, and dielectric integrity even under prolonged exposure to sunlight, moisture, and elevated temperatures.
In the wire and cable industry, CSPE is widely used as a jacketing and insulation material for heavy-duty industrial cables. Its ability to withstand oils, acids, alkalis, and extreme weather conditions makes it a preferred choice for applications such as control wiring, outdoor power cables, and transportation systems. The compound’s flame-retardant and low-smoke properties also contribute to its safety in environments requiring enhanced fire performance and electrical insulation stability.
CSPE offers excellent mechanical toughness and long-term durability, making it suitable for installations that experience high heat, chemical exposure, or continuous outdoor operation. These qualities allow cables utilizing CSPE jackets to maintain performance consistency and extend service life in demanding applications across industries such as power generation, manufacturing, and infrastructure.
CSPE materials are commonly tested and certified under standards from UL (Underwriters Laboratories), ASTM (American Society for Testing and Materials), and IEC (International Electrotechnical Commission). These organizations establish guidelines for thermal endurance, flame resistance, dielectric performance, and chemical stability in cable insulation and jacketing applications.
CSPE was first developed by DuPont in the 1950s under the brand name Hypalon® as an advanced alternative to traditional rubber compounds. Its superior resistance to weathering, chemicals, and heat led to widespread use across industrial sectors. Although DuPont discontinued Hypalon production in 2010, equivalent CSPE materials continue to be manufactured worldwide, maintaining the same mechanical and environmental performance standards that made it an industry benchmark.