1.1 This part of ISO 20568 establishes a system of designation for fluoropolymer materials, which may be used as the basis for specifications. 1.2 The various types of fluoropolymer are differentiated from each other by a classification system based on appropriate levels of the designatory properties. 1.2.1 For PTFE 1.2.1.1 For polytetrafluoroethylene (PTFE) granular moulding and ram extrusion materials, and for polytetrafluoroethylene (PTFE) resin produced from coagulation of dispersion a) Standard specific gravity (SSG) b) Bulk density c) Particle size 1.2.1.2 For aqueous dispersion of polytetrafluoroethylene (PTFE) a) PTFE percentage in dispersion b) Surfactant percentage in dispersion c) Surfactant tolerance level 1.2.2 For melt processable resins 1.2.2.1 For CPT, ECTFE, EFEP, ETFE, FEP, PFA, PVDF, PVF, VDF/CTFE, VDF/HFP, VDF/TFE, VDF/TFE/HFP a) melting peak temperature b) Melt mass flow rate 1.2.2.2 For PCTFE a) zero strength time (ZST) 1.2.2.3 For TFE/PDD a) Glass transition temperature (Tg) 1.2.2.4 For aqueous dispersion of melt processable resins ( ETFE, FEP, PFA, PVDF, PVF, VDF/CTFE, VDF/HFP, VDF/TFE, VDF/TFE/HFP) a) Polymer percentage in dispersion b) Surfactant percentage in dispersion c) Surfactant tolerance level and on information about the intended application and/or method of processing, important properties additives, colorants, fillers and reinforcing materials. 1.3 The designation system is applicable to all fluoropolymers and blends. It applies to unmodified materials ready for normal use and materials modified, for example, by colorants, additives, fillers, reinforcing materials, and polymer modifiers 1.4 One should not assume that materials having the same designation give the same performance. This part of ISO 20568 does not provide engineering data, performance data or data on processing conditions which may be required to specify a material. If such additional properties are required, they shall be determined in accordance with the test methods specified in part 2 of this International Standard, if suitable. 1.5 In order to designate a thermoplastic material to meet particle specifications, the requirements are to be given in data block 5 (see 3.1).