NF EN ISO 7792-1

La présente norme décrit et explicite le système de désignation des résines d'homopolymères polyamides pour moulage et extrusion sur la base du système de désignation international utilisé au TC 61. La désignation comprend quatre parties comportant respectivement et successivement : le symbole, l'application envisagée ou le procédé de transformation, les caractéristiques essentielles, les propriétés de désignation. Pour les trois dernières parties, les informations sont codées à l'aide de lettres ou de chiffres dont les significations sont précisées dans la norme. Les éléments déterminants qui permettent de lire la désignation sont la référence de la norme en tête, puis l'ordre dans lequel se succèdent les lettres et les chiffres.

<p>ISO 7792-1:2012 establishes a system of designation for thermoplastic polyester (TP) material, which may be used as the basis for specifications. It covers polyester homopolymers for moulding and extrusion based on poly(ethylene terephthalate) (PET), poly(butylene terephthalate) (PBT), poly(cyclohexylenedimethylene terephthalate) (PCT), poly(ethylene naphthalate) (PEN), poly(butylene naphthalates) (PBN) and other TP-types and copolyesters of various compositions for moulding and extrusion.</p> <p>The types of thermoplastic polyester are differentiated from each other by a classification system based on appropriate levels of the designatory properties (viscosity number and tensile modulus of elasticity) and on information about the intended application and/or method of processing, important properties, additives, colorants, fillers and reinforcing materials.</p> <p>ISO 7792-1:2012 is applicable to thermoplastic polyester homopolymers and copolymers. It applies to materials ready for normal use in the form of powder, granules or pellets, unmodified or modified by colorants, additives, fillers, etc.</p> <p>ISO 7792-1:2012 does not apply to the saturated polyester/ester and polyether/ester thermoplastic elastomers covered by ISO 14910.</p> <p>It is not intended to imply that materials having the same designation give necessarily the same performance. ISO 7792-1:2012 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. </p> <p>If such additional properties are required, they shall be determined in accordance with the test methods specified in ISO 7792-2, if suitable. In order to specify a thermoplastic polyester material for a particular application or to ensure reproducible processing, additional requirements may be given in data block 5.</p>