Weather-Stable Low-Gloss Powder Coatings

By P. Thometzek, U. Freudenberg, U. Meier-Westhues, Ken Yonek

Manufacturing weather-stable powder coatings with a matte surface and consistent quality is a challenge to the powder coatings industry. Technically acceptable results are achieved using the dry blend process, but one-shot formulations based on polyurethane raw materials or the use of a bifunctional polyurethane matte hardener offer interesting alternative solutions. Investigation of the powder coating films using a perthometer and an electron microscope provides a deeper understanding of the matte powder coating systems.