EN ISO 20028-1:2017

SLOVENSKI STANDARD
01-junij-2017
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SIST EN ISO 7792-1:2014
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Plastics - Thermoplastic polyester (TP) moulding and extrusion materials - Part 1:
Designation system and basis for specification (ISO 20028-1:2017)
Kunststoffe - Thermoplastische Polyester (TP)-Formmassen - Teil 1:
Bezeichnungssystem und Basis für Spezifikationen (ISO 20028-1:2017)
Plastiques - Polyesters thermoplastiques (TP) pour moulage et extrusion — Partie 1 :
Système de désignation et base de spécification (ISO 20028-1:2017)
Ta slovenski standard je istoveten z: EN ISO 20028-1:2017
ICS:
83.080.20 Plastomeri Thermoplastic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 20028-1
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2017
EUROPÄISCHE NORM
ICS 83.080.20 Supersedes EN ISO 7792-1:2012
English Version
Plastics - Thermoplastic polyester (TP) moulding and
extrusion materials - Part 1: Designation system and basis
for specifications (ISO 20028-1:2017)
Plastiques - Matériaux polyesters thermoplastiques Kunststoffe - Thermoplastische Polyester (TP)-
(TP) pour moulage et extrusion - Partie 1: Système de Werkstoffe - Teil 1: Bezeichnungssystem und Basis für
désignation et base de spécification (ISO 20028- Spezifikationen (ISO 20028-1:2017)
1:2017)
This European Standard was approved by CEN on 3 February 2017.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20028-1:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 20028-1:2017) has been prepared by Technical Committee ISO/TC 61 "Plastics"
in collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by
NBN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2017, and conflicting national standards
shall be withdrawn at the latest by September 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN ISO 7792-1:2012.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 20028-1:2017 has been approved by CEN as EN ISO 20028-1:2017 without any
modification.
INTERNATIONAL ISO
STANDARD 20028-1
First edition
2017-03
Plastics — Thermoplastic polyester
(TP) moulding and extrusion
materials —
Part 1:
Designation system and basis for
specifications
Plastiques — Matériaux polyesters thermoplastiques (TP) pour
moulage et extrusion —
Partie 1: Système de désignation et base de spécification
Reference number
ISO 20028-1:2017(E)
©
ISO 2017
ISO 20028-1:2017(E)
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
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CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved

ISO 20028-1:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Designation system . 2
4.1 General . 2
4.2 Data block 1 . 2
4.3 Data block 2 . 3
4.4 Data block 3 . 4
4.5 Data block 4 . 5
4.5.1 General. 5
4.5.2 Viscosity number . 5
4.5.3 Tensile modulus of elasticity . 6
4.6 Data block 5 . 7
5 Examples of designations . 7
5.1 Designation only . 7
5.2 Designation transformed into a specification . 9
Annex A (normative) Designation of thermoplastic polyesters .10
Bibliography .13
ISO 20028-1:2017(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,
as well as information about ISO’s adherence to the World Trade Organization (WTO) principles in the
Technical Barriers to Trade (TBT) see the following URL: www . i so .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 9,
Thermoplastic materials.
This first edition of ISO 20028-1 cancels and replaces ISO 7792-1:2012, which has been technically
revised to introduce a new designation system.
The revised designation system is published under a new ISO number, as many existing documents
refer to ISO 7792-1. If the existing ISO 7792-1 would be replaced by the new designation system, these
documents would refer to the incorrect designation system.
In order to give users time to switch from ISO 7792-1 to ISO 20028-1, any designation system according
to ISO 7792-1 is to be phased out in 5 to 10 years.
A list of all parts in the ISO 20028 series can be found on the ISO website.
iv © ISO 2017 – All rights reserved

ISO 20028-1:2017(E)
Introduction
ISO 7792-1 is complex and does not fit with daily practice anymore. In practice, ISO 1043 and ISO 11469
are, in combination, “improperly” being used as a designation system for, for example, marking. The
aim of this revision is to simplify the data block system and to connect more to ISO 1043 and ISO 11469,
where the first two blocks are used for generic identification and marking of products.
INTERNATIONAL STANDARD ISO 20028-1:2017(E)
Plastics — Thermoplastic polyester (TP) moulding and
extrusion materials —
Part 1:
Designation system and basis for specifications
1 Scope
This document establishes a system of designation for thermoplastic polyester (TP) material,
which can 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.
The types of thermoplastic polyester are differentiated from each other by a classification system
based on appropriate levels of the designatory properties:
a) viscosity number;
b) tensile modulus of elasticity;
and on information about the intended application and/or method of processing, important properties,
additives, colorants, fillers and reinforcing materials.
This designation system 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, fillers and other additives. This document does not apply to the saturated
polyester/ester and polyether/ester thermoplastic elastomers covered by ISO 20029.
It is not intended to imply that materials having the same designation give necessarily the same
performance. This document does not provide engineering data, performance data or data on processing
conditions which can be required to specify a material. If such additional properties are required, they
are intended to be determined in accordance with the test methods specified in ISO 20028-2, if suitable.
In order to designate a thermoplastic polyester material to meet particular specifications, the
requirements are to be given in data block 5 (see 3.1).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1043-1, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special
characteristics
ISO 1043-2, Plastics — Symbols and abbreviated terms — Part 2: Fillers and reinforcing materials
ISO 1628-5, Plastics — Determination of the viscosity of polymers in dilute solution using capillary
viscometers — Part 5: Thermoplastic polyester (TP) homopolymers and copolymers
ISO 20028-2, Plastics — Thermoplastic polyester (TP) moulding and extrusion materials — Part 2:
Preparation of test specimens and determination of properties
ISO 20028-1:2017(E)
ASTM D5927, Standard Classification System for and Basis for Specifications for Thermoplastic Polyester
(TPES) Injection and Extrusion Materials Based on ISO Test Methods
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
4 Designation system
4.1 General
The designation system for thermoplastics is based on the following standardized pattern.
Designation
Description Identity block
Block International Individual item block
(optional) Standard
number Data block 1 Data block 2 Data block 3 Data block 4 Data block 5
block
The designation consists of an optional description block, reading “Thermoplastics”, and an identity
block comprising the International Standard number and an individual-item block. For unambiguous
designation, the individual-item block is subdivided into five data blocks comprising the following
information.
— Data block 1: Identification of the plastic by its symbol PET, PBT, PCT, PEN, PBN or TP for all such
polyesters and copolyesters in general, in accordance with ISO 1043-1 (see 4.2).
— Data block 2: Position 1: Fillers or reinforcing materials and their nominal content (see 4.3).
Position 2: Declaration of recyclate (REC) plastics and their contents if desired.
— Data block 3: Position 1: Intended application and/or method of processing (see 4.4).
Positions 2 to 8: Important properties, additives and supplementary information
(see 4.4).
— Data block 4: Designatory properties (see 4.5).
— Data block 5: For the purpose of specifications, a fifth data block contains appropriate information
(see 4.6).
The first character of the individual item block shall be a hyphen. The five data blocks shall be separated
from each other by a comma. If a data block is not used, this shall be indicated by doubling the separation
sign, i.e. by two commas (,,). Terminal commas may be omitted.
NOTE Data blocks 1 and 2, when separated by a hyphen, form the part marking symbol
4.2 Data block 1
In this data block, after the hyphen, thermoplastic polyesters are identified using the symbols and
designations listed in Table 1 and Table 2.
2 © ISO 2017 – All rights reserved
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