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Powdercoating
powdercoating electrocoating

Powder Coating is a method of painting products that uses a powdered plastic resin, which is electrostatically applied and cured onto the part in an oven. SPCI operates three powder coating systems, which are designed and maintained for both part quality and production efficiency. Whether your parts are large or small, or need to be a specific color or texture, SPCI has the proper system for you.

Types of Powder Coatings

Powder is available in a wide variety of formulations, textures, gloss levels, and colors. Common formulations applied at SPCI include; epoxy, hybrid, urethane, polyester, and silicones. Depending on the performance criteria of your specific parts, SPCI can help you pick the proper formulation for your application.

Powder coating is an extremely attractive, durable, scratch resistant, chemical resistant, and UV resistant coating. Depending on the specific formulation applied, each of these properties will vary. In general, epoxies exhibit good mechanical properties but fare poorly in direct sun light. Urethanes and polyesters exhibit excellent weatherability. Silicones exhibit excellent resistance to heat.

Benefits of Powder Coating

  • Environmentally-friendly: Unlike most liquid coatings, there are no solvents to evaporate in the powder coating process. We do not emit any VOCs into the air, thus minimizing the impact on the environment. Also, no paint sludge has to be disposed of because powder can be reclaimed and recycled.
  • Thorough Treament: Powder coating provides superior edge coverage. Since powder coated parts have virtually no drips, runs, or sags, the reject rate is very low. In addition, part to part color consistency is held to a tolerance which is not visible to the naked eye.
  • Quick Process: Parts are cured within minutes of exiting the oven.

The Powder Coating Process

The process starts at SPCI by hanging your part on an overhead conveyor. SPCI stocks a large variety of hanging fixtures in order to maximize the line density. First, the part is washed with an alkaline solution, rinsed, pretreated with iron or zinc phosphate, and rinsed again. A chrome free conversion coating for architectural aluminum can be applied if needed.

Once the part has been pretreated it is dried in a dry off oven. The next step is the electrostatic application of the powder to the part. The powder is charged by an electrode at the tip of the application gun. The powder particles pass by the electrode and picks up a negative charge. Since the parts are grounded to the conveyor, there is an electrostatic attraction of the powder particle to the part much like a magnet is attracted to a piece of steel.

The parts now enter the curing oven where the powder melts, cross links, and bonds to the surface of the part. Once the parts exit the oven and cool, they are inspected, packaged, and ready for use.

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