Comparable to Hypalon, these CSM sheets are engineered to resist breaking down from acids, alkalies, oils, greases, and ozone. They absorb little water and resist cracking and abrasion from weather and heat. Use them in a variety of applications exposed to weather and chemicals from roofing systems to timing belts and engine shields. CSM has a higher tensile strength than Santoprene but is less flexible. Also known as chlorosulfonated polyethylene. All come with a material certificate that includes their traceable lot number and cure date.