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 powder is
custom formulated from thermosetting polyester resins, curing agents, pigments
and modifiers, to meet specific end-use requirements for durability, chemical
resistance, and UV protection. Resins and pigments are mixed while molten and
then cooled and solidified. The resulting material has a completely uniform
composition. The cooled material is then ground to the desired particle size for
application to the metal.
Electrostatic Application Offers More
Uniform Coating
Electrostatic
spraying is the most common method for applying powder coatings, and is the method
chosen by  .
powder is fed pneumatically from
a reservoir to a spray gun where a low amperage, high voltage charge is imparted
to the particles. The parts to be coated are grounded so that the charged
particle will seek the oppositely charged metal surfaces. With this method, a
single application can produce a uniform, monolithic, fusion-bonded
finish.
The powder-coated parts then enter an oven where the resins,
pigments, and other reactive agents crosslink to produce a high molecular weight
binder system, resulting in a tough, durable coating. The mechanical and
physical properties of are listed in Figure
1.
Superiority
was developed for outstanding weatherability,
toughness, and architectural aesthetics. When considering the advantages of the
powder coating process, it's difficult to understand why anyone would
choose a lighting standard coated with liquid paint.
? powder coating is 100% solid with every powder
particle containing the total color system.
? The high molecular weight of
powder coatings provide better corrosion,
impact, chip, and scratch resistance, which means less damage.
? Adhesion
problems associated with multiple coats of liquid paint are eliminated.
?
There are no runs, sags or drips in powder
finishes.
? Paint defects such as solvent popping, pinholes, and blistering
are eliminated, since there are no solvents in powders.
? is highly resistant to diluted aqueous acids, salts,
aliphatic and aromatic hydrocarbons, solvents, alcohols, grease and
oils.
? provides UV protection which
eliminates chalking and minimizes color fading. Low molecular weight, liquid
systems simply can't compare with high
molecular weight powders. Liquid system finishes are easily chipped and
scratched, and require constant care to maintain appearance, and most important,
to prevent corrosive damage.
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standard
coating system