Electrolube’s range of UL-approved epoxy and polyurethane (PU) resins is developed for circuit protection, and incorporates a variety of materials with diverse process characteristics and properties. The collection includes four conventional polyurethane (polyol) resins (UR5600 series); four PolyBd (polybutadiene) resins that are highly effective in repelling moisture (UR5000 series); and five epoxy resins (ER2000/ ER2100). Most of these two-part products use alumna hydrate as a flame retardant. With low levels of smoke and toxic fumes when compared with other methods, this is claimed to be a ‘clean’ way of achieving highly effective flame retardancy. PU resin as an alternative to conventional epoxies can offer substantial savings in both manufacturing time and costs, with faster ambient temperature cures, increasing production rates. While PU resin has a lower peak operating temperature range, the PolyBd is effective in temperatures as low as –60°C. Being softer and more flexible than traditional epoxies, PU also induces very low stress on components as a result of shrinkage.
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