1、BS EN ISO 20028-2:2017Plastics Thermoplasticpolyester (TP) moulding andextrusion materialsPart 2: Preparation of test specimensand determination of properties (ISO20028-2:2017)BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN ISO 20028-2:2017 BRITISH STANDARDNati
2、onal forewordThis British Standard is the UK implementation of EN ISO20028-2:2017. It supersedes BS EN ISO 7792-2:2012 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/82, Thermoplastic materials.A list of organizations represented on this committee
3、can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2017. Published by BSI Standards Limited 2017ISBN 978 0 580 87270 9ICS 83.080.20Compl
4、iance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2017.Amendments/corrigenda issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISC
5、HE NORM EN ISO 20028-2 March 2017 ICS 83.080.20 Supersedes EN ISO 7792-2:2012English Version Plastics - Thermoplastic polyester (TP) moulding and extrusion materials - Part 2: Preparation of test specimens and determination of properties (ISO 20028-2:2017) Plastiques - Matriaux polyesters thermoplas
6、tiques (TP) pour moulage et extrusion - Partie 2: Prparation des prouvettes et dtermination des proprits (ISO 20028-2:2017) Kunststoffe - Thermoplatische Polyester (TP)-Werkstoffe - Teil 2: Herstellung von Probekrpern und Bestimmung von Eigenschaften (ISO 20028-2:2017) This European Standard was app
7、roved 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 nation
8、al 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 languag
9、e 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, H
10、ungary, 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 COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMU
11、NG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 20028-2:2017 EBS EN ISO 20028-2:2017EN ISO 20028-2:2017 (E) 3 European foreword This document (EN ISO 2002
12、8-2:2017) 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 e
13、ndorsement, 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 f
14、or identifying any or all such patent rights. This document supersedes EN ISO 7792-2:2012. 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, Cz
15、ech 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 Unit
16、ed Kingdom. Endorsement notice The text of ISO 20028-2:2017 has been approved by CEN as EN ISO 20028-2:2017 without any modification. BS EN ISO 20028-2:2017ISO 20028-2:2017(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 24 Preparation of test specimens 34.1 General . 34.2
17、Treatment of the material before moulding 34.3 Injection moulding . 35 Conditioning of test specimens . 46 Determination of properties 4Bibliography 7 ISO 2017 All rights reserved iiiContents PageBS EN ISO 20028-2:2017ISO 20028-2:2017(E)ForewordISO (the International Organization for Standardization
18、) 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 repr
19、esented 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 deve
20、lop 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
21、/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 durin
22、g 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 me
23、aning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by
24、Technical Committee ISO/TC 61, Plastics, Subcommittee SC 9, Thermoplastic materials.This first edition of ISO 20028-2 cancels and replaces ISO 7792-2:2012, which has been technically revised.A list of all parts in the ISO 20028 series can be found on the ISO website.iv ISO 2017 All rights reservedBS
25、 EN ISO 20028-2:2017INTERNATIONAL STANDARD ISO 20028-2:2017(E)Plastics Thermoplastic polyester (TP) moulding and extrusion materials Part 2: Preparation of test specimens and determination of properties1 ScopeThis document specifies the methods of preparation of test specimens and the standard test
26、methods to be used in determining the properties of thermoplastic polyester moulding and extrusion materials. Requirements for handling test material and for conditioning both the test material before moulding and the specimens before testing are given.Procedures and conditions for the preparation o
27、f test specimens in a specified state and procedures for measuring properties of the materials from which these specimens are made are given. Properties and test methods which are suitable and necessary to characterize thermoplastic polyester moulding and extrusion materials are listed.The propertie
28、s have been selected from the general test methods in ISO 10350-1. Other test methods in wide use for or of particular significance to these moulding and extrusion materials are also included in this document, as are the designatory properties specified in ISO 20028-1 (viscosity number and tensile m
29、odulus of elasticity).In order to obtain reproducible and comparable test results, it is necessary to use the methods of specimen preparation and conditioning, the specimen dimensions and the test procedures specified herein. Values determined will not necessarily be identical to those obtained usin
30、g specimens of different dimensions or prepared using different procedures.2 Normative referencesThe 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 un
31、dated references, the latest edition of the referenced document (including any amendments) applies.ISO 62, Plastics Determination of water absorptionISO 75-2, Plastics Determination of temperature of deflection under load Part 2: Plastics and eboniteISO 291, Plastics Standard atmospheres for conditi
32、oning and testingISO 527-2, Plastics Determination of tensile properties Part 2: Test conditions for moulding and extrusion plasticsISO 294-1, Plastics Injection moulding of test specimens of thermoplastic materials Part 1: General principles, and moulding of multipurpose and bar specimensISO 1133-2
33、, Plastics Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics Part 2: Method for materials sensitive to time-temperature history and/or moistureISO 1183-1, Plastics Methods for determining the density of non-cellular plastics Part 1: Immersion method, li
34、quid pyknometer method and titration method ISO 2017 All rights reserved 1BS EN ISO 20028-2:2017ISO 20028-2:2017(E)ISO 1183-2, Plastics Methods for determining the density of non-cellular plastics Part 2: Density gradient column methodISO 1183-3, Plastics Methods for determining the density of non-c
35、ellular plastics Part 3: Gas pyknometer methodISO 1628-5, Plastics Determination of the viscosity of polymers in dilute solution using capillary viscometers Part 5: Thermoplastic polyester (TP) homopolymers and copolymersISO 3451-2, Plastics Determination of ash Part 2: Poly(alkylene terephthalate)
36、materialsISO 4589-2, Plastics Determination of burning behaviour by oxygen index Part 2: Ambient-temperature testISO 10350-1, Plastics Acquisition and presentation of comparable single-point data Part 1: Moulding MaterialsISO 11357-2, Plastics Differential scanning calorimetry (DSC) Part 2: Determin
37、ation of glass transition temperature and glass transition step heightISO 11357-3, Plastics Differential scanning calorimetry (DSC) Part 3: Determination of temperature and enthalpy of melting and crystallizationISO 11359-2, Plastics Thermomechanical analysis (TMA) Part 2: Determination of coefficie
38、nt of linear thermal expansion and glass transition temperatureISO 20753, Plastics Test specimensIEC 60093, Solid electrical insulating materials Method of test for volume resistivity and surface resistivityIEC 60112, Method for the determination of the proof and the comparative tracking indices of
39、solid insulating materialsIEC 60243-1, Electrical strength of insulating materials Test methods Part 1: Tests at power frequenciesIEC 60250, Recommended methods for the determination of the permittivity and dielectric dissipation factor of electrical insulating materials at power, audio and radio fr
40、equencies including metre wavelengthsIEC 60296, Fluids for electrotechnical applications Unused mineral insulating oils for transformers and switchgearIEC 60695-11-10, Fire hazard testing Part 11-10: Test flames 50 W horizontal and vertical flame test methods3 Terms and definitionsNo terms and defin
41、itions are listed in this document.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp2 ISO 2017 All rights rese
42、rvedBS EN ISO 20028-2:2017ISO 20028-2:2017(E)4 Preparation of test specimens4.1 GeneralThe test specimens shall be prepared by injection moulding. It is essential that specimens are always prepared by the same procedure, using the same processing conditions.The material shall be kept in moisture-pro
43、of containers until it is required for use.Moisture content of filled or reinforced materials shall be expressed as a percentage of the total mass of the compound.NOTE At the time of publication of this document, the ISO 294 series is being revised, defining only the injection-moulding conditions an
44、d referring to ISO 20753 for the dimensions of the specimens. Other International Standards that have hitherto used different designations for the same specimen type are also intended to be revised to bring the designations into line with those in ISO 20753. Many test standards, specifying test spec
45、imen or referring to other standards as ISO 3167 and the ISO 294 series, will be revised in due time and also refer to ISO 20753.4.2 Treatment of the material before mouldingBefore processing, the moisture content of the material sample shall not exceed 0,02 % (by mass). In the case of filled materi
46、als, this limit refers to the total mass of thermoplastic and filler.To ensure that the moisture content remains low, it is recommended that the sample material in the feed hopper of the injection-moulding machine be blanketed with any suitable gas (e.g. dried air, nitrogen or argon). Better results
47、 may be obtained using a dehumidifier hopper dryer.4.3 Injection mouldingInjection-moulded specimens shall be prepared in accordance with ISO 294-1, using the conditions specified in Table 1.Table 1 Conditions for injection moulding of test specimensMaterial Melt temperatureMould temperatureAverage
48、injection velocityHold pressure timeTotal cycle timeC C mm/s s sPBT, unfilled, semi-crystalline 260 80 200 100 20 5 40 5PBT, unfilled, semi-crystalline, im-pact-modified and/or flame-retarded250 80 200 100 20 5 40 5PBT, filled, semi-crystalline 260 80 200 100 20 5 40 5PBT, filled, semi-crystalline,
49、im-pact-modified and/or flame-retarded250 80 200 100 20 5 40 5PET, unfilled, amorphous 285 20 200 100 20 5 40 5PET, filled, semi-crystalline 285 135 200 100 20 5 40 5PET, filled, semi-crystalline, nucleated 285 110 200 100 20 5 40 5PET, filled, semi-crystalline, flame-retarded275 135 200 100 20 5 40 5 ISO 2017 All rights reserved 3BS EN ISO 20028-2:2017ISO 20028-2:2017(E)Material Melt temperatureMould temperatureAverage in
