What is Powder Coating?

Powder is a dry coating. Instead of being dissolved or suspended in a liquid medium, such as solvent or water, powder is applied in a granular form. This material is finer than ground pepper but coarser than flour, and is applied directly to the surface to be coated.

Powder Formulation

There are two distinct types of powder, Thermoset and Thermoplastic. The Thermoset powders are reactive, which means that under cure conditions there is a chemical "cross linking", so that, once cured, the coating will not remelt. Epoxies, acrylics and most hybrids are examples of Thermoset powders, making up over 90% of the current powder market.

Thermoplastic powders do not "cross link" when cured, but simply melt and flow over the surface of the part.

The film hardens on cooling, but if it is reheated it will remelt. Vinyls, nylons and fluorocarbons are examples of thermoplastic powders.

Enamel powder is a specialized formulation used in applications that previously used liquid porcelain enamel. It utilizes glass in its formulation and is cured, or fired, at very high heat. The result is a finish that is particularly resistant to heat, scratching and harsh chemicals, and is typically used in appliances, such as washers, dryers, ovens and ranges.

How is the powder applied?

The application process involves applying a charge to the dry powder particles and spraying them onto a grounded substrate. The powder, once attracted to the part, is then held on the surface until it is melted and cured into a smooth coating film in the bake oven.

The powder is fed pneumatically out of the powder container, or hopper, into the powder applicator, or gun.

As the powder exits the gun, a low amperage, high voltage charge is applied to the powder particles, causing them to be attracted to the grounded work piece. This attraction may even cause the powder to "wrap"around the piece, coating the back side.

NOW we now know more about powder coating then we ever thought we would. The above is just a portion of what you will find if you go to www.powder-mart.com, they know everything about powder coating.

Another great source is Eastwood Co. www.eastwoodco.com.

SO to answer the question, is it OK to powder coat springs? Well that depends. In the amount of heat applied during the curing process. Too much heat is harmful to springs. Once springs begin to get hotter than 350 degrees Fahrenheit they begin to anneal, that is the steel starts to get soft, the temper is lost and the spring will not support any weight.

In order to safely powder coat springs the temperature MUST remain below 350 degrees!!!!

If you are debating between powder coating and chroming your springs, powder coating is safer.

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