What is powder coating?

Powder coating is becoming one of the most wanted surface finishing techniques now a days. The definition of powder coating is the process of applying dry paint to a part. In comparison to normal wet painting such as house paints, the solids are in suspension in a liquid carrier, which must evaporate before the solid paint coating is produced.

While liquid finishes contain solvents which have pollutants known as volatile organic compounds (VOC’s), powder coatings contains no solvents and release negligible amounts, if any, of VOC’s into the atmosphere, hence eliminating the need for costly pollution control equipment. In addition, most powder coating overspray that does not adhere to the part can be retrieved and reused, virtually eliminating the waste found in liquid finishing systems.

With no VOC’s, the air used to exhaust the powder spray booth can be recirculated directly into the plant, eliminating the cost of heating or cooling the make-up air. Energy is also saved with the curing ovens. Solvent-based coatings must heat and exhaust huge volumes of air to ensure that the solvent fumes do not reach a potentially explosive level, but the exhaust requirements in powder coating ovens are lower.

Greater efficiency is achieved because powder coating requires no drying or flash-off timet parts can be racked closer together on a powder rack or conveyor, and more parts can be coated . Powder coating does not run, drip, or sag, and this results in significantly lower reject rates.

Powder coating provides an attractive and durable finish, offering excellent resistance to corrosion, heat, impact, and abrasion.