Q: We are a manufacturer of solid brass vanity sink legs. We would like to offer some powder coat finishes on our legs, specifically black. However, the powder thickness must be kept to 0.001-0.0015 in., maximum.
Is this very thin film possible with powder coating?
A: Powder coatings are a very durable coating that can work well for your application. However, powder coatings are typically applied somewhat thicker than the tolerance you’re looking for. We quote the recommended thickness in mils (0.001 in.) or microns.
Nearly all powder coatings are recommended to be applied at 1.5 mils (about 40 microns) and higher. If the 0.001 thickness is an absolute requirement, it will be very difficult to find a powder coating that will work for your application.
Another important consideration is cure temperature. Powder coatings typically require a bake temperature of 350°F (177°C) and higher. If the brass components discolor around these temperatures, it will a challenge to find a product that cures at a significantly lower temperature. The chemistries are available, but they are a specialty.