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Conformal coatings are used to protect electronic components from possible environmental exposure; they allow moisture to escape but protect against contamination. More recently, conformal coatings are being used to reduce the formation of whiskers [2] and to prevent current bleed between closely positioned components.
Despite a widespread myth, Araldite was not used in the production of the De Havilland Mosquito aircraft in the 1940s. Another Aero Research Limited glue was used, called Aerolite, which was not an epoxy resin, but a gap-filling urea-formaldehyde adhesive.
Conformal coating gives most of the benefits of potting, and is lighter and easier to inspect, test, and repair. Conformal coatings can be applied as liquid or condensed from a vapor phase. When potting a circuit board that uses surface-mount technology , low glass transition temperature (T g ) potting compounds such as polyurethane or silicone ...
It can be used as an adhesive, laminate, plug, filler, sealant, or electrical insulator and can be drilled, ground, tapped, machined, sanded, and painted when cured. J-B Kwik is a faster-curing two-part epoxy with medium-temperature resistance up to 300 °F (149 °C).
Sealant is a substance used to block the passage of fluids through openings in materials, [1] a type of mechanical seal. In building construction sealant is sometimes synonymous with caulk (especially if acrylic latex or polyurethane based) [2] and also serve the purposes of blocking dust, sound and heat transmission. Sealants may be weak or ...
In the electronics industry epoxy resins are the primary resin used in overmolding integrated circuits, transistors and hybrid circuits, and making printed circuit boards. The largest volume type of circuit board—an " FR-4 board"—is a sandwich of layers of glass cloth bonded into a composite by an epoxy resin.