Powder Types

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Elimination of VOCs and reduction of wastes saves money and helps companies comply more easily and economically with the regulations of the U.S. Environmental Protection Agency. In fact, one of the major elements in expanding the market for powder coating has been the implementation over the past 30 years of stringent air pollution control legislation.

"Things to consider about Powders and your powder coating projects"

Powder is basically dry paint consisting of 4 or 5 components:

1. Resin
2. Cross linker (not used in Thermo plastic powders)
3. Pigments
4. Flow Aids
5. Degassing Solvent (Solid)

Two basic types of powders:

1. Thermo set Powders - Curing or crosslinking takes place so that once cured, the coating will not remelt. The majority of powder coatings today are thermosetting type powder. Typical Thermosetting type powders are:
   • Epoxies
   • Acrylics
   • Most polyesters
2. Thermoplastic Powders - Do not crosslink and can remelt after curing when exposed to sufficient heat. Typical Thermoplastic powders are:
   • Vinyl’s
   • Nylons
   • Fluorocarbons

Functional vs. Decorative Powders

Most Decorative Coatings are applied as relatively thin (1-4 mils) thermo set powder coatings and typically used for:

• Various automobile parts
• Appliances
• Clear coatings
• Functional powders are typically used for protective purposes.

Kinds of Powder:

Epoxy Polyester Hybrid Powders

Not suitable for outdoor applications. Resistant to over-baking. Typical Applications:

• Shelving
• Hot water heaters
• Power tools
• Fire extinguishers

Polyester TGIC Powders

Maintains excellent mechanical properties at film build above 3 mils. Good edge coverage. Typical Applications:

• Aluminum extrusions
• Automotive wheels
• Air conditioners
• Lawn furniture

Polyester Urethane Powder

Combine very smooth, thin film, excellent mar and chip resistance, and good weathering properties. Applications include:

• Light fixtures
• Lawn and garden equipment
• Electrical enclosures
• Air conditioners
• Automotive trim

Acrylic Urethane

Offers better weathering, and improved chemical resistance compared to polyester urethanes. Flexibility and impact resistance is poor. Typical Applications:

• Plumbing fixtures
• Automotive wheels
• Vending machines

GMA Acrylic Powders

Faster cure and improved weatherability than acrylic urethanes. Well suited for clear top coats. Typical Applications:

• Plumbing fixtures
• Automotive wheels
• Microwave cavities

Acrylic Hybrid Powders

Offer good weatherability, mechanical properties, and flexibility, but not outdoor durable. Typical Applications:

• Metal furniture
• Lighting fixtures