Determination of the acid value, hydroxyl value, and isocyanates in raw materials for the fabrication of plastics by automatic potentiometric titration

The determination of the acid value, the hydroxyl value, and the isocyanates plays an important part in the analysis of raw materials for plastics. This Application Bulletin describes the determination of these characteristic values by automatic potentiometric titration. The acid value and hydroxyl value are determined according to ASTM D4662 and ASTM E1899 respectively, the isocyanate value is determined according to ISO 14896 method A.