This part of ISO 1043 specifies uniform symbols for terms referring to fillers and reinforcing materials. It includes only those symbols that have come into established use, and its main aim is both to prevent the occurrence of more than one symbol for a given filler or reinforcing material and to prevent a given symbol being interpreted in more than one way. NOTE For symbols and abbreviated terms for basic polymers and their special characteristics, see ISO 1043-1, for plasticizers see ISO 1043-3, and, for flame retardants, see ISO 1043-4.