polyurethane catalyst pmdeta in sustainable wood and metal coatings abstract: pentamethyldiethylenetriamine (pmdeta) is a tertiary amine catalyst widely used in polyurethane (pu) coatings due to its high catalytic activity, particularly in promoting the blowing (water-isocyanate reaction) and gelling (polyol-isocyanate reaction) reactions. this article delves into the application of pmdeta in sustainable wood and metal coatings,...