Manufacturer page.

VapAir Seal 725TR is a 40-mil composite consisting of 35 mils of self-adhering rubberized asphalt laminated to a 5-mil polypropylene film. A one-piece silicone poly release liner is applied to the SBS adhesive to prevent the material from bonding to itself. The factory-controlled thickness of the membrane ensures uniform barrier properties on the job. The woven polypropylene film increases strength and has a non-skid surface suitable for bonding of subsequent layers. VapAir Seal 725TR can be used on concrete, plywood, exterior gypsum, or other approved substrates in conjunction with Carlisle Syntec roofing systems. VapAir Seal 725TR must be covered with a roofing membrane within 120 days. T-joints must be sealed with an internal bead of Carlisle lap sealant.