Henry Blueskin WB25 Window Wrap Flashing Tape Blueskin WB25 window and door flashing is a self-adhered membrane consisting of an SBS styrene-butylene-styrene rubberized asphalt compound which is integrally laminated to a blue engineered film. The membrane is specifically designed to be self-adhered to a prepared substrate. Features include Application in temperatures as low as 12 deg. C. 10 deg. F. . Excellent adhesion to prepared substrates of concrete, concrete block, primed steel, aluminum mill finish, anodized aluminum, galvanized metal, gypsum board, and plywood. Impermeable to air, moisture vapor, and water. Easy-to-install peel and stick application, no flame required. Factory controlled thickness. Membrane is self-sealing when penetrated with self-tapping screws or nails. Uses include Concealed self-adhered air and vapor barrier membrane and protection against rain and moisture penetration. Commonly used to prevent drafts and provide a weathertight seal around windows and doors, joints in sheathing, sealing around skylights, and as a flashing in residential construction. 25 Mm. thickness. Size 12 In. x 75 Ft., Color Black, Thickness 25 Mil., Pkg Qty 1, Package Type Roll WARNING This product can expose you to chemicals including polycyclic aromatic compounds possibly present in asphalt in trace amounts which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.