Airlok® Sheet 400 HT/NP is a 40-mil, 36” x 75’ laminated, modified asphalt, self-adhesive, non-permeable sheet membrane bonded to a cross-laminated polyethylene sheet designed for air and moisture applications. Provides a 60-day UV exposure with a broad service/performance temperature up to 260°F. Rubberized-asphalt properties allow for self-sealing around fasteners, sealing of laps, adhesion to the substrate at ambient application temperatures above 40°F (5°C). Designed for use under metal cladding and copings.