A rupturable seal comprising a film of a first polymer, a film of a second polymer
and a sealing interlayer. The sealing interlayer has a melting point higher than
the melting points of either the first polymer or the second polymer and comprises
a plurality of micro-fibers each having an average effective fiber diameter from
about 2.5 m to about 7.0 m. Fusion bonding of films of the first
polymer and the second polymer to either side of a sealing interlayer produces
a rupturable seal having a frangible interface including portions thereof wherein
the first polymer contacts the second polymer. The rupturable seal parts at the
frangible interface by application of force causing a gap and separation of the
first film from the second film.
