EMI screened windows

Standard terminations for individually produced emi shielded windows are flying mesh, foil or silver painted busbar or conductive gasket. Sheet-cut windows, including stepped types, are only available with silver busbar and optional emi gaskets. Care should be taken with stepped windows, particularly glass ones, as the pressure exerted by the gasket under compression can easily overstress even a fully laminated window. We suggested that stepped windows should be plastic or a composite where the glass pane is not under pressure when mounted.

Most gaskets in our range can be used with shielded windows and the actual type selected will depend on the degree of shielding and environmental protection required. Please contact us for technical advice.

Edge Bonded EMI Shielded Windows

Edge bonded windows use the same substrates and mesh as the fully laminated versions, but are only laminated around their edges, outside the ‘viewing area’, and are lower cost. They are not as suitable for stepped construction but if the windows are relatively small or when the viewing area remains smaller than the smallest of the two pieces (i.e. bezel mounted where the edge remains covered albeit stepped) it is not a major problem. Edge bonded emi shielded windows can be curved by utilising ‘matched pairs’ of window blanks but do not feature the use of tinted inter-layers. Standard edge bonded windows are a cost-effective solution for most commercial applications.

Cast Plastic EMI Shielded Windows

Cast shielded windows are formed by encapsulating the mesh gauze within a thermosetting plastic or resin substrate. The process has advantages inherent to the manufacturing technique, such as surface finishes, tints, minimum thickness and physical strength. The process necessitates a silver busbar termination although a stepped construction is possible during the machining of the cast blank. Cast windows cost more than edge laminated ones but are more robust for specialist applications.