Classic Metals now offers our clients the added option to have products powder coated.
Classic Metals is supported by Powder-Lak,one of the
leading powder manufacturers in South Africa whom is
approved by the S.A.B.S for organic powder for
architectural aliminium SANS 1578:2006
What Is Powder Coating?
Definition: Powder coating is the process of coating a
surface in which a powder material is applied using an
electrostatic or compressed air method. The applied
powder is then heated (cured) to its melting point,
after which it flows to form a smooth film which dries
to a firm, durable finish very resistent to scratches,
cracking, peeling, UV rays and rust.
The entire powder coating process involves several steps.
Very generally:
a blasting, stripping and/or solvent cleaning step to
insure the substrate is free of any oils, dirt, rust,
mill scale, etc;
a pretreatment step (an important step not done by all
coaters) during which the product is treated with a
pretreatment chemical or conversion coating, usually
phosphate or zinc based, to further protect it and
improve the surface for powder adherence;
rinse, rinse, rinse..dry completely then
powder coat, usually done with an electrostatic gun,
but sometimes in a fluidized bed;
finally, FULLY cure the powder in the oven, generally
at 375-400 deg. F, 15-20 minutes (varies) , making
sure the oven is preheated to temp
Advantages of Powder Coating
Although a finish represents only one attribute of a
coated part, it is the most visible and influentialcharacteristic to the consumer. Powder coatings have a
positive impact on the consumer, both directly and
indirectly, and provide solutions to issues of public
concern. Powder coatings havebecome the coating
technology of choice for consumable goods from
toolboxes,internal and external coating of pipes for
surface and underground applications, bicycles, office
furniture, and outdoor furniture to widespread markets
such as appliance and automotive.In order to use
electrostatic properties of the powder gun,the surface must
be able to conduct elecricity.Some examples of conductive
matrials are :Hot and cold rolled steel,mild steel,stainless steel,
copper,brass,aliminiumand plated steel,such as galvanized steel.
Quality: The unique rheological and application
characteristics of powder coatings provide superior
consistency and uniformity of finish without sags,
drips, runs, or bubbles.It provides extremely tough,
durable films, enhancing the high quality, value-added
image of consumer products. In general, the performance
properties, such as impact resistance, flexibility, and
corrosion resistance, of powder coatings are better than
with liquid paints. Powder coated parts resist cracking,
peeling, and marring during handling and normal service
use. In many cases, merchandise is specifically being
advertised as "POWDER COATED" because of the quality
image it projects.
Enviromental: Environmental issues are of significant
interest and importance to the government and general
public today. Unlike many liquid paints, powder coatings
are compliant with environmental regulations. Liquid
paints often contain solvents, which can contribute to
air pollution and, in some cases, ozone depletion.
Powder coatings are free of such pollutants. Wet
painting processes can generate sludge, which must be
disposed of into hazardous waste landfills. Properly
formulated powder coatings generate no such hazardous
waste. The consumer can feel good about buying a
powder-coated product, which is ENVIRONMENTALLY
RESPONSIBLE.