This part of EN ISO 15023 establishes a system of designation for poly(vinyl alcohol) (PVAL) materials which may be used as the basis for specifications.The types of poly(vinyl alcohol) (PVAL) materials are differentiated from each other by a classification system based on the designatory properties:a) degree of hydrolysisb) viscosity of aqueous solution under defined conditionsand on information about basic polymer parameters, intended application and/or method of processing, important properties, additives, colorants, fillers and reinforcing materials.This part of EN ISO 15023 is applicable to poly(vinyl alcohol) (PVAL) materials with a degree of hydrolys