Abstract: A heat exchanger (24) is provided and includes a heat exchanger core (30), a housing (32), and a seal structure (34). The core (30) has a pair of opposite faces bounded by a periphery (40), and includes a plurality of enclosed flow passages (50) to direct a first fluid through the core (30) and a plurality of open flow passages (52) extending between their opposite faces (36, 38) to direct a second fluid through the core (30). The seal structure (34) is sandwiched between the housing (32) and a majority of the periphery (40) to restrict bypassing of the second fluid around the open flow passages (52).

Abstract: In general this invention relates to a composite seal or gasket for inhibiting the release of a volatile organic compound such as fuel. The composite seal assemblies (10, 70, 100, 130, 160, 180 and 200) include a deformable portion interconnected to a vapor barrier portion via a mechanical or adhesive interlocking connection. The deformable portion can be formed from an elastomeric material. The vapor barrier portion can be formed from a wide variety of materials that inhibit permeation of the organic vapor. Examples of the materials for the vapor barrier include ductile metals, plastic polymers, and fluoroplastic polymers. The gaskets and seals can, but are not restricted to, be used between the connections of the components in an automotive or consumer product fuel system.