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.

UV-stable.

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.