There are three primary resins used in thermoplastic powders, vinyls,nylons and polyesters. These materials are used for some food contactapplications, playground equipment, shopping carts, hospital shelv-ing and other applications. Few of the thermoplastics have the broadrange of appearance properties, performance properties and stabilitythat are required in applications that use thermoset powders. Sometypical properties of the different resins are listed in the chart on pageI/4.Thermoplastic powders are typically high molecular weight materialsthat require high temperature to melt and flow. They are commonlyapplied by fluidized bed application and the parts are both pre-heatedand post-heated.Most of the thermoplastic powder coatings have marginal adhesionproperties so that the substrate must be blasted and primed prior toapplication.
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