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Powder Coating

Powder coating is a type of coating that is applied as dry powder. Powder Coating is typically applied electrostatically and is then cured under heat to allow it to flow and form a skin. Powder coating is mainly used for coating on metal parts.

Powder Coating can not be used for coating on plastic parts due to the high heat necessary for the curing process. 


Types of Powder Coating Materials

  • Thermoplastic
  • Thermo Set

Thermoplastics

Thermoplastics are synthetic materials that can be formed multiple times. High temperatures can melt thermoplastics, Thermoplastic powders are not a good choice for situations where a part might be exposed to high heat. Thermoplastics powder coats has good wear and chemical-resistance. Below are the some of commonly used materials as thermoplastics powder coats.

Nylon

  • Nylon powder coat is durable and impact resistant.
  • Provide excellent protection against chemicals and solvents
  • FDA approved for food contact grades are available
  • Due to low friction coefficient, nylon coating is used on gears and conveyor equipment.

Polyvinyl Chloride (PVC)

  • PVC coat is pliable, sleek and durable.
  • FDA approved food contact grades are available
  • Very Good electrical insulators

Polyolefin

  • Polyolefin powder coat are resistant to abrasives and chemical
  • Offer a smooth surface and excellent adhesion properties.
  • Polyolefin coatings are used on components that require regular cleanings.

Polyester

  • Polyester powder coatings has good weather & abrasion resistant
  • Polyester coatings looks great and generally used in outdoor furniture, automobile parts
  • Some polyester powder grades are shield the elements and maintain their color with only minor fading over the years.

Thermosets

Thermoset powder coating makes a chemical cross-linking reaction that is non-reversible when baked. This cross-linking changes the physical properties of the plastic, typically hardening them into a solid coating. Some thermosets have the ability to withstand temperatures of over 540 degrees celsius.

Epoxy

  • Epoxy powder coated surfaces are hard and electrically insulate
  • Epoxy powder coats are brittle but when exposed to sunlight, they tend to chalk and dull over time. This is the reason epoxy powder coating is done on indoors parts.

Epoxy Polyester Hybrid

  • Less likely to chip or crack better than epoxy.
  • Less chalking and better weathering in outdoor conditions due to presence of polyester.

​Acrylic

  • Acrylics performs better than epoxy in sunlight and blend over a surface, leaving a high gloss, wet-looking finish
  • Used as clear coat
  • Give super gloss finish.

Silicon-Based Powders

  • High temperature powders are composed of silicone resins, curing catalysts and glass filler materials.
  • Silicon based powders are able to withstand temperatures of over 500 degrees celsius.

 

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