TYPES OF POWDER COATING
Epoxy: The formula contains epoxy type resin and suitable hardening agent. It is used when resistance against chemicals is needed. Particularly the fuel tanks can be given as an example. Such kind of coatings has less strength against temperature and light.
Epoxy-Polyester: It contains epoxy and polyester resin. It is the type of coating developed for providing physical and chemical strength properties together. It is particularly an inevitable solution for the white appliances industry. In addition to this, lighting fixtures, metal furniture, hospital equipment, armatures, and shower cabins can be coated with such kind of coatings. Although it is stronger than epoxy type coatings in terms of temperature and light resistance, it has less resistance than the outdoor polyester coatings. Its cost is lower than the other types of coatings.
Polyester/PRIMID: It is another exterior wall product made by using polyester resin and Primid hardening agent. It is developed as an alternative to Polyester/TGIC product. As is known, products containing TGIC have to receive some certain labeling marks according to the European Union norms, while Primid products do not contain any marking. They generally have the same characteristics with TGIC products. They are used for coating outdoor materials, particularly in the aluminum profile industry. These are Qualicoat certified products.
Polyurethane: It is made by hardening isocyanate with polyester resin. There are two types, including indoor and outdoor. The only handicap during the past years was the smoke it emitted during the curing process. The smoke problem has been solved in last versions of this kind of coatings, which allow very smooth surfaces.
Epoxy: These yield excellent chemical resistance (acid, alkali and salt solvents), corrosion resistance, good mechanical properties, flexibility, high level of adhesion, and resistance to abrassion. This group will chalk with exposure to sunlight. So this series is recommended for interior applications.
Epoxy-Polyester (Hybrid): These are epoxy powders with blend of polyester resins used for indoor applications. This series is similar to epoxies with improved resistance to yellowing in sunlight and weatherability. But unfortunately it still will chalk on exposure to sunlight. This Series are resistant to wide variety of solvents and chemicals depending on formulation. Chemical resistance requirements must be considered according to processing conditions and final use of the finished product.
Polyester-TGIC: These offer resistant to chalking, UV light, weatherability. This series is recommended for both interior and exterior applications.
Polyester – PRIMID-TGIC Free: These offer similar mechanical properties to polyester with TGIC system but have some distinct advantages and disadvantages. Advantages are higher transfer efficiency, excellent storage stability, better flow of surface. The only disadvantage of this system is film thickness but this problem is solved considerably by improved formulations. The most important feature of this group is not contain heavy metals and toxic substances harmful to the human health.
Polyurethane: These are caprolactam-free-IPDI cured polyester based powder coating used for both indoor and outdoor applications with very good chemical and physical resistance. This series show outstanding thin-film appearance and toughness with excellent weather resistance. Advantages are higher transfer efficiency, excellent storage stability, better flow of surface, superior mar resistance and they are highly resistant to humidity and salt spray.