1.1 This part of ISO 7391 establishes a system of designation for polycarbonate thermoplastic material,
which may be used as the basis for specifications.
1.2 The types of polycarbonate plastic are differentiated from each other by a classification system based
on appropriate levels of the designatory properties
a) viscosity number;
b) melt volume-flow rate;
c) Charpy impact strength;
and on information about the intended application and/or method of processing, important properties,
additives, colorants, fillers and reinforcing materials.
1.3 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.
1.4 It is not intended to imply that materials having the same designation give necessarily the same
performance. This part of ISO 7391 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 Part 2 of this International Standard, 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 3.1).
In diesem Teil von ISO 7391 wird ein Bezeichnungssystem für thermoplastische Polycarbonat-Formmassen festgelegt, das als Grundlage für Spezifikationen dienen kann. Polycarbonat-Formmasse-Typen werden mit Hilfe eines Einteilungssystems voneinander unterschieden, das auf geeigneten Wertebereichen der kennzeichnenden Eigenschaften a) Viskositätszahl, b) Schmelze-Massenfließrate, c) Schlagzähigkeit und Informationen über vorgesehene Verwendungen und/oder Verarbeitungsverfahren, wichtige Eigenschaften, Additive, Farbstoffe, Füll- und Verstärkungsstoffe beruht.