POWDER COATING 101
What is Powder Coating?
Powder coating is a type of coating that is applied as dry powder, i.e. a dry finishing process. Finely ground particles of pigment and resin are electro-statically charged and sprayed on to the surface to be coated. Electro-static attraction holds the powder to surface till the surface is cured in an oven under controlled high temperatures, which results in the particles melting and fusing to form a smooth solid coating.
Differentiating from Conventional Technology:
Powder coating, a relatively newer technology, has replaced liquid paint in many applications. Unlike liquid paint powder coating does not require a solvent to keep the binder and filler parts in liquid suspension form.
Some of the advantages powder coating has over the conventional liquid paint technology are:
- Near zero emission of volatile organic compounds (which may be harmful & toxic).
- Comparatively thicker coatings without running or sagging.
- Overspray is recycled, thus minimizing the waste of powder to almost zero.
- Produces less hazardous waste.
- There is no need to maintain viscosity balance.
- Rejection of material to be coated is highly minimized because damaged coating can be blown off and re-coated.