Epoxypoeder

Epoxypoeder, or epoxy powder coating, is a dry powder coating used to protect and decorate metal surfaces. It consists of epoxy resin and a curing agent (hardener), often with pigments, fillers and additives. The powder is electrostatically applied to grounded metal parts and then melted and crosslinked by heat to form a continuous, uniform film. Because there are no solvents, epoxypoeder is typically considered an environmentally favorable coating method.

There are several variants of epoxy powder coatings. 100% epoxy powders provide excellent chemical and corrosion resistance and are commonly used for indoor applications. To improve outdoor durability and UV resistance, epoxy powders are frequently blended with polyesters or other modifiers, resulting in epoxy/polyester or epoxy/polyurethane blends. Film properties can be tailored for gloss, hardness and flexibility, with typical coating properties including good adhesion to metal substrates, good edge coverage, and strong barrier protection against moisture and chemicals.

Application and curing require specialized equipment. The powder is applied by electrostatic spray or in a fluidized bed, then heated to melt and cure the coating. Typical cure temperatures range from about 160 to 210 degrees Celsius, with exposure times adjusted to film thickness. Typical dry film thicknesses are in the 50 to 120 micrometer range. Epoxypoeder is widely used on automotive parts, household appliances, architectural fittings, electrical enclosures, and other metal components where corrosion resistance and a durable finish are required.

Limitations include limited outdoor UV stability for pure epoxy systems, which is why blends are common for exterior use. Overbake or overheating can cause gloss loss or film damage, so proper cure schedules are essential.