Bronze / Copper powders for Powder Coatings

For: Powder Coatings - detailed information

Indicative formulations:

Pigment: 2 -5%
Binder: 98 - 95% (expoxy / polyurethane)
General information:

There are three processes used for the powder coating application.

1. Free blending process
   This process involves the free mixing of the pigment with binder prior to electrostatically spraying the blend onto the substrate to be coated. This process is the most suitable for the use of standard pigments. Since it does not involve any extrusion, standard pigments will retain an optimal metallic shine.
2. Extrusion process
   In this process, pigment and binder are extruded together and then grounded to fine particles prior to being electrostatically sprayed. The extrusion process damages considerably the metallic pigments because of the shear forces applied . As a result, a lower metallic shine is obtained.
3. Bonded process
   Pigment and binder are slowly heated up until they "stick" together. This process involves less waste than the free blending process at the time of application. But the bonded product, which can only be prepared by specialised firms, is costly.