hdi trimer  vencorex hdt-90b   about: tolonate™ hdt 90 b is an aliphatic polyisocyanate trimer (hdi homopolymer) supplied at 90% solids in a butyl acetate. it is used for high solids two-component polyurethane coatings and varnishes as well as aromatic solvent-free 2 k polyurethane coatings. this product is also suggested for exterior protective coatings for automotive oem, car...