1.1 This part of ISO 4613 establishes a system of designation for ethylene/vinyl acetate thermoplastic material, which may be used as the basis for specifications. 1.2 The types of E/VAC plastics are differentiated from each other by a classification system based on appropriate levels of the designatory properties a) vinyl acetate content b) melt flow rate and on information about intended application and/or method of processing, important properties, additives, colorants, fillers and reinforcing materials. 1.3 This part of ISO 4613 is applicable to all ethylene vinyl acetate copolymers containing from 3 % (m/m) to 50 % (m/m) (approximately 25 % molar) of vinyl acetate. It applies to materials ready for normal use in the form of powder, granules or pellets and to materials unmodified or modified by colorants, additives, fillers, etc. 1.4 It is not intended to imply that materials having the same designation give necessarily the same performance. This part of ISO 4613 does not provide engineering data, performance data or data on processing conditions which may be required to specify a material for a particular application and/or method of processing. If such additional properties are required, they shall be determined in accordance with the test methods specified in ISO 4613-2, if suitable. 1.5 In order to specify a thermoplastic material for a particular application or to ensure reproducible processing, additional requirements may be given in data block 5 (see clause 3, introductory paragraph).