URONAL BN 75 is blocked aliphatic polyisocyanate (homopolymer HDI blocked MEKO), diluted 75% in aromatic solvent. URONAL BN 75 is typically used as a crosslinking agent for hydroxylated polymers, in particular polyesters and polyacrylates, for the preparation of heat-activated one-component polyurethane systems, weather-resistant coatings that give excellent mechanical properties in combination with exceptional resistance to solvents, abrasion and products chemists.