As many articles on Polyetylene thermoplastic powder start out, it is an organic finish that is separated into two chemical categories: thermoset and thermoplastic. We all know that thermoset is the most common powder coating considered to be thin but hard. Conversely, thermoplastic always goes unrecognized as it is expensive and difficulty to apply before. And this article will give you some suggestions that you should reevaluate thermoplastic with technical improvements and cost reduction nowadays.
But why do we pay much attention to Polyetylene thermoplastic powder? The answer is "performance". Thermoplastic Polyethylene Powder have incomparable performance that traditional thermoset cannot reach. But we are not saying the thermoset powder coating should go out the competition and be replaced by thermoplastic powders. They have different features to suit different applications. Here we list a detail comparison that may help you know more about these two powder coatings.
Thermoplastic Polyethylene Powder features longer chain molecules; in contrast, thermoset powder coating starts with short molecules which are cross-linked together during the curing process to form a permanent matrix based on an irreversible chemical reaction. And the structure differences determine the different properties of these two powder coatings.
Most thermoplastic powder coatings are in lighter weight so that fewer pounds of thermoplastic powders are used to achieve the same thickness of thermoset coating.
Generally, thermoset powder coating is considered as a thin, rigid and tightly cross-linked coating; while thermoplastic powder coating is thicker than thermoset - about 8 mils to 100 mils in thickness for specific requirements.
Flexibility & impact resistance
High hardness enables the Thermoplastic Polyethylene Powder extremely resistant against scratch and mar. Thermoplastic type is more closely associated with plastic film featuring high flexibility, ductility and high percent elongation which impart high impact resistance to the coating, yet lower scratch and mar resistance. But our Adherest polyethylene powder coating breaks this limitation - that is because its high adhesion ensures the coating tightly adheres to the parts regardless of the rough scratch and mar.
Both thermoplastic and thermoset powder coatings are dry particulates that will melt and flow to from a smooth coating. However, thermoplastic powder coating is recyclable as they will soften and flow again if reheated at a temperature about 300°F. And thermoset powder coating is irreversible after the initial cure and cooling. Thus, they are not recyclable.
From above aspects, we come to a conclusion that these two powder coatings have both pros and cons. And here we list the detail properties of these two powder coatings as shown in the following table.
Extremely adhesive to metal
Superb impact resistance.
Can be remolded and reshaped.
Excellent corrosion resistance.
Detergent and chemical resistance.
Flexibility and elongation of the coating film.
Superb corrosion resistance.
May soften when reheated.
May be expensive than thermoset.
More resistant against high temperature.
Hard and rigid.
Thin to thick wall capability.
High mechanical property.
Excellent dimensional stability.
Much more difficult to surface finish.
Cannot be remolded or reshaped.
So if your application requires a high-performance powder coating such as those provide 5000 hours salt spray protection, 10 years of UV resistance and excellent impact resistance, just shake off traditional thermoset type and start to brave the new world of thermoplastic powder coatings. We believe they will not let you down. Come on in, the water's fine!