AST sealant tapes are preformed, resilient, self-adhesive,
expanding tape seals made from an open-cell foam that has been impregnated with a
water-based, acrylic-modified asphalt emulsion and then compressed to a sealing density
level appropriate to the application. Typically, higher compression levels are required
for water-tightness in water run-off applications; lower compression can be used, for
example, for snow seals at roof ridges.
They are suitable for use
against metal, plastic trim, and other materials common in metal building structures.
Benefits of AST
Will not dry out and become hard or brittle.
The seals are UV-stable and
highly resistant to aging and vermin (bugs, rodents, birds, etc.)
Will not extrude from
between joints when squeezed, which is a possibility with caulk or butyl-type tapes.
May be used in non-moving
gasket-type applications as well as in moving expansion/contraction-type joints.
Material is supplied with
self-adhesive on one side. After removal of packaging, material begins gradual expansion -
more slowly in cold weather than in hot.
AST Sealant Tapes have been the sealants of choice of grain-bin
manufacturers, metal roof and building component manufacturers,
architects and engineers and discerning erectors for more than 30 years.