Abstract: A fluid flow path, a microfluidic device including the fluid flow path, and methods of forming the same are described. The fluid flow path can include an inlet and at least one outlet, and is defined by a first substrate and a second substrate, each having one or more fluid via extending therethrough, and an adhesive sealant between the first substrate and the second substrate, wherein the adhesive sealant surrounds at least one via of each substrate such that fluid flows through the vias and an area bounded by the adhesive sealant between the substrates. The adhesive sealant can be a bismaleimide-containing compound.

Abstract: A printhead includes a printhead die and an interconnect substrate. The printhead die includes a surface. The interconnect substrate includes electrical circuitry and a surface. The electrical circuitry is in electrical communication with the printhead die through a plurality of electrical connections. An encapsulant structure is positioned to encapsulate the plurality of electrical connections, and includes a barrier portion and a filler portion. The barrier portion includes a first wall and a second wall. The first wall is in contact with the surface of the printhead die and the second wall is in contact with the surface of the interconnect substrate. The filler portion is in contact with the plurality of electrical connections and positioned between the first wall of the barrier portion and the second wall of the barrier portion.