From Epoxy Adhesive Formulations


Plastic foams are manufactured from thermoplastic and thermoset resins in various forms. The main pitfall in joining plastic foam is that of (1) causing the foam to swell or collapse by contact with a solvent or monomer and (2) having the adhesive alter the properties of the foam through its absorption into the foam. Adhesion and joining are usually not a serious problem because of the porous nature of the foam.

Note that there are closed-cell and open-cell foams. Adhesives may spread or wick deeply into the open-cell variety, thereby affecting the resulting mechanical properties of the foam and perhaps even weakening the foam. When foam is bonded to another less porous substrate, the adhesive could be applied to the nonfoam substrate to minimize the wicking and ingress of the adhesive into the body of the foam. With the closed-cell variety, the adhesive cannot wick deeply into the foam, but usually the foam's skin must be machined or abraded to allow for some surface roughness for the adhesive to mechanically attach.

There are also low-surface-energy foams, such as polyethylene, that require either surface treatment or special adhesives for bonding. Fortunately, extremely strong bonds are generally not required because the foam has a relatively low cohesive strength. Therefore, simple cleaning is generally the only surface preparation required. The surface treatments that are recommended are those that are described in the previous section for the parent plastics. However, the possibility of wicking of the chemical compounds into the foam...

Products & Services
Foam Tapes
Foam tapes have a foam carrier, which can provide conformability and cushioning features.
Foam Fabrication Services
Foam fabrication services providers produce products made from foam cores, foam plastic, cushioning foam, closed cell foam, acoustic foam, and polyurethane foam.
Overlays and Veneers
Overlays, veneers and surfacing materials are bonded to a surface to impart a decorative finish or graphical pattern.
Foam Cores
Foam cores and foam core materials are low density, high porosity materials used between structural skins to form a cored laminate with increased stiffness. Industrial foams consist of low density elastomers, plastics, or other materials with internal open or closed porosity.

Topics of Interest

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