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Hybrid powders were conceived by combining two base resins into a thermoset curing scheme. Epoxies typically cured with highly reactive curing agents were instead matched with a specially designed carboxyl functional polyester resin. The overall cost of the binder system was significantly less than a traditionally cured thermoset and the coating performance was pretty decent. The overall performance was somewhere between very hard and chemically resistant epoxy and a softer, very flexible polyester.

This type of chemistry fills a large niche in the coating market. Because of the epoxy content hybrids are relegated to indoor applications but the addition of a significant polyester content gave this chemistry very good color stability in the curing process. The color of epoxies can shift dramatically due to variable oven conditions and part size and density. Hybrid’s low cost, stable color and relatively good film performance made them a natural choice for the a multitude of indoor applications.