NF EN ISO 7391-1
Plastics. Polycarbonate (PC) moulding and extrusion materials. Part 1 : designation system and basis for specifications.
La présente norme décrit et explicite le système de désignation des résines de poly(méthacrylate de méthyle) (PMMA) pour moulage et extrusion, sur la base du système de désignation international utilisé au TC 61. La désignation comprend quatre parties comprenant 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.
ISO 7391-1:2006 establishes a system of designation for polycarbonate thermoplastic material, which may be used as the basis for specifications. The types of polycarbonate plastic are differentiated from each other by a classification system based on appropriate levels of the designatory properties viscosity numbermelt volume-flow rateCharpy impact strength and on information about the intended application and/or method of processing, important properties, additives, colorants, fillers and reinforcing materials. This part of ISO 7391 is applicable to thermoplastic polyesters of carbonic acid and aromatic dihydroxy compounds. The polyester may be a homopolymer, a copolymer or a mixture of the two. 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.
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