AST is a self-adhering foam tape impregnated with water-based acrylic-modified asphalt emulsion.
It is an excellent alternative to butyl tape & open-cell polyurethane foam strips.
Will not dry out and become hard and brittle.
Highly resistant to bugs and vermin.
Will not extrude from between joints like caulk or butyl tapes.
Conforms to contours and fills gaps.
Maintains a seal during thermal expansion and contraction of building panels.
Excellent compressibility and recovery (minimal compression set).
Good thermal and sound insulator.
No shrinkage or blow-out due to closed-cell breakage.
Supplied with self-adhesive on one side. After removal of packaging, material begins gradual expansion – more slowly in cold weather than in hot.