Chlorosulfonated polyethylene (CSPE)

{ [ (CH2) nlCHCl (CH2) n2]n3CHSO2Cl}n


What is Chlorosulfonated polyethylene?

Synthetic rubber (CSM). Chlorosulfonated polyethylene is a family of chlorinated elastomers. The materials is made by reacting polyethylene with chlorine and sulfur dioxide to yield chlorosul-fonated polyethylene. The reaction changes the thermoplastic polyethylene into a synthetic elastomer that can be compounded and vulcanised.

Chlorine content is between 27% - 45%

CSPE is sometimes known as Hypalon – a trade name established by its developer DuPont.



The basic polyethylene contributes chemical inertness, resistance to damage by moisture, and good dielectric strength. Inclusion of chlorine in the polymer increases its resistance to fire (self-extinguishing), oil, and the action of microorganisms and exhibits good adhesion to various surfaces


What is it used for?

In construction CSPE’s weatherability, UV stability and adhesion capability have made this material very popular as a commercial roofing material. Other applications include wire and cable sheathing and paint.

Other uses include the manufacture of tubes, tank linings, protective layers which are acid-resistant and resistant to ozone as well as rubber gaskets and other products.

Well-known consumer products include shoe soles and garden hoses.


Environment and health

Known emissions resulting from burning / incineration include hydrogen chloride (HCl), carbon monoxide (CO), sulfur dioxide (SO2), organic acids, aldehydes, and alcohols.