Using Powder Coatings

 Properties

Epoxy powders: can be formulated to give high gloss and smooth coatings with excellent adhesion, flexibility and hardness as well as solvent and chemical resistance. The main deficiencies are their poor tolerance to heat and UV light as well as their pronounced tendency to yellow at elevated temperatures and on exposure to diffused day light. Chalking will occur in an exterior environment.

Polyester powders: general performance can be categorised between epoxy and acrylic powders. They have excellent durability and a high resistance to yellowing under ultra-violet light. Most coatings used on buildings today are TGIC-free.

Epoxy polyester hybrid powders: are epoxy powders by origin containing a high percentage of special polyester resin (sometimes exceeding 50%). These hybrids have properties similar to those of epoxy powders, however, their additional advantage is that they have improved resistance to overbake yellowing and improved weatherability. Hybrid powders are now regarded as the main backbone of the powder coatings industry for interior applications.

Polyurethane powders: provide good all-round physical and chemical properties as well as giving good exterior durability.

Acrylic powders: have good gloss and colour retention on exterior exposure as well as heat and alkali resistance.