Outstanding UV and ozone resistance. Good performance at low temperatures. Good resistance to chemicals, acids and oils. CSPE is an excellent floating cover and lining material with one of the best weathering warranties available. Chlorosulfonated Polyethylene (CSPE) geomembrane and cover materials are highly UV stabilized. CSPE has been used as a lining and cover material for more than 30 years and has shown exceptional durability and longevity in potable water facilities.