Schluter-DITRA is manufactured using high-density polyethylene (HDPE), which does not rot and is highly resistant to solutions containing salts, acids, and alkalis, as well as many organic solvents, alcohols, and oils. Its resistance to specific stresses can be provided if concentration, temperature, and exposure time are known. Schluter-DITRA is waterproof and resists the transmission of vapor. The material is inert, non-toxic, and physiologically safe. Schluter-DITRA also meets the American National Standard for Load Bearing, Bonded, Waterproof Membranes for Thin-Set Ceramic Tile and Dimension Stone Installations (ANSI A118.10) and is listed by cUPC. For copies of the listing, please contact Schluter-Systems at (800) 472-4588 (USA) or (800) 667-8746 (CAN) or by e-mail at firstname.lastname@example.org.