Determination of Isocyanate groups/ NCO number

This method is suitable for the determination of free Isocyanates in Polyurethane adhesive, Polyester, Polyurethan-Prepolymere, lacquer and in varitiation of the used solvents as generall method. The Isocyanates are reacted with an surplus of Diisobutylamine and titrated back with HCl.