This part of ISO 19064 establishes a system of designation for styrene/acrylonitrile (SAN) moulding and extrusion materials, which may be used as the basis for specifications.The types of styrene/acrylonitrile plastic are differentiated from each other by a classification system based on appropriate levels of the designatory properties,a) Vicat softening temperature,b) melt mass-flow rate,and on information about composition, intended application and/or method of processing, important properties, additives, colorants, fillers and reinforcing materials. This part of ISO 19064 is applicable to all copolymers of styrene and/or substituted styrene having between 5 % (m/m) and 50 % (m/m) acrylonitrile. It applies to materials ready for normal use, unmodified or modified by colorants, additives, fillers, etc.