When a trash can factory selects powder coating, the decision is usually based on where the bin will be used, the metal substrate, and the required finish. For most outdoor waste bins, the factory uses an outdoor-grade polyester powder coating, often a TGIC-free or HAA-cured polyester system. This type offers strong UV resistance, color retention, and good mechanical performance. Indoor bins or cost-sensitive models may use an epoxy-polyester hybrid powder coating, which provides excellent hardness and adhesion but is less suitable for long-term sun exposure. Pure epoxy coatings are sometimes specified for special chemical resistance, but they chalk and fade outdoors, so they are not the first choice for street or park trash cans.
The second part of the question is whether this coating is scratch-resistant. In normal use, a quality powder-coated trash can is more resistant to scratches, scuffs, chipping, and abrasion than many conventional liquid paints because the powder forms a hard, crosslinked film after curing. However, no powder coating is completely scratch-proof. Resistance depends on resin chemistry, curing schedule, film thickness, pigment type, surface texture, and additives. A standard polyester coating may show light marks under sharp metal contact, while an enhanced scratch-resistant formulation can use wax, PTFE, or nano-silica/alumina additives to reduce surface friction and improve mar resistance. Proper curing is critical: undercured films are softer and more prone to damage.
Factories usually verify performance with pencil hardness, cross-cut adhesion, impact, Taber abrasion, and salt-spray tests. For outdoor trash cans, a well-cured polyester powder coating with suitable pretreatment and a film thickness around 60–90 microns typically delivers a good balance of weather resistance and scratch resistance. If the customer needs extra protection in high-traffic areas, the factory can specify an anti-scratch additive package, a textured finish that hides marks, or a slightly thicker film. So the practical answer is: trash can factories commonly use outdoor polyester or epoxy-polyester powder coatings, and these coatings are generally scratch-resistant in everyday use, but they are not completely scratch-proof.
