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The concept of finishing metallic surfaces by applying dry powders which, when fused, form continuous and integrated coatings, has developed steadily since its practical inception in the mid 1950’s. Initiallythermoplastic resins were employed, but within the lastthree decades thermosetting powders have been developed which open up a much wider field of use.
The increasing use of thermosetting powders has beennecessary because of the need to reduce air and waterpollution coupled with the fact that with today’s risingcosts of basic raw materials and labour, powder coating is often a viable commercial consideration when compared to conventional industrial liquid paints.
Some of the more obvious advantages of using thermosetting powders are:
Ready for use
Reduction in the fire risk as no solvent required
No costly wastage of solvent : environmental cleanliness
No effluent disposal problems
No air pollution
Reduced health hazard to operators
Processing time reduced
Economy in reduced energy requirements
Superior film properties
Damaged parts easily rectified
Air requirements reduced : cost savings
95% powder utilization
Controlled film thickness
Wide range of coatings available
Surface pretreatment
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