How is it done — electrostatic spray?
The powder is applied with an electrostatic spray gun to a part that is at earth (or ground) potential. Before the powder is sent to the gun it is fluidized: to separate the individual grains of powder and so improve the electrostatic charge that can be applied to the powder and so that the powder flows more easily to the gun. Because the powder particles are electro statically charged, the powder wraps around to the back of the part as it passes by towards the air off take system. By collecting the powder, which passes by the job, and filtering it, the efficiency of the process can be increased to 95% material usage. The powder will remain attached to the part as long as some of the electrostatic charge remains on the powder. To obtain the final solid, tough, abrasion resistant coating the powder coated items are placed in an oven and heated to temperatures that range from 160 to 210 degrees C (depending on the powder). Under the influence of heat a thermosetting powder goes through 4
