1、BS ISO9988-2:2006ICS83.080.20NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWBRITISHSTANDARDPlastics Polyoxymethylene(POM) moulding andextrusionmaterialsPart2:Preparation of test specimensanddetermination of propertiesBS EN ISO 9988-2:2015BS EN ISO 9988-2:2015ISBN 978 0 580 87204 4Amendm
2、ents/corrigenda issued since publicationDate Comments30 April 2015 This corrigendum renumbers BS ISO 9988-2:2006 as BS EN ISO 9988-2:2015This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2009 The British Standards Institution 2015. Pub
3、lished by BSI Standards Limited 2015National forewordThis British Standard is the UK implementation of EN ISO 9988-2:2015. It is identical to ISO 9988-2:2006. It supersedes BS ISO 9988-2:2006 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/82, Ther
4、moplastic materials.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot c
5、onfer immunity from legal obligations.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 9988-2 March 2015 ICS 83.080.20 English Version Plastics - Polyoxymethylene (POM) moulding and extrusion materials - Part 2: Preparation of test specimens and determination of properties (ISO 9988-2:2006)
6、Plastiques - Matriaux base de polyoxymthylne (POM) pour moulage et extrusion - Partie 2: Prparation des prouvettes et dtermination des proprits (ISO 9988-2:2006) Kunststoffe - Polyoxymethylen-(POM-)Formmassen - Teil 2: Herstellung von Probekrpern und Bestimmung von Eigenschaften (ISO 9988-2:2006) Th
7、is European Standard was approved by CEN on 1 March 2015. 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 referenc
8、es 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 me
9、mber 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, F
10、rance, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES
11、 KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 9988-2:2015 EEN ISO 9988-2:2015 (E) 3 Foreword The text of ISO 9988-2:2006 has been prepa
12、red by Technical Committee ISO/TC 61 “Plastics” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 9988-2:2015 by Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by NBN. This European Standard shall be given the status of a nation
13、al standard, either by publication of an identical text or by endorsement, at the latest by September 2015, and conflicting national standards shall be withdrawn at the latest by September 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of pa
14、tent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. 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, C
15、roatia, 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey an
16、d the United Kingdom. Endorsement notice The text of ISO 9988-2:2006 has been approved by CEN as EN ISO 9988-2:2015 without any modification. BS EN ISO 9988-2:2015EN ISO 9988-2:2015 (E)BS ISO 9988-2:2006INTERNATIONAL STANDARD ISO 9988-2:2006(E) ISO 2006 All rights reserved 1Plastics P olyoxymethylen
17、e (POM) moulding and extrusion materials Part 2: Preparation of test specimens and determination of properties1 Scope This part of ISO 9988 specifies the methods of preparation of test specimens and the test methods to be usedin determining the properties of polyoxymethylene moulding and extrusion m
18、aterials. Requirements forhandling test material and for conditioning both the test material before moulding and the specimens before testing are given.Procedures and conditions are described for the preparation of test specimens, and procedures are given formeasuring properties of the materials fro
19、m which these specimens are made. Properties and test methodswhich are suitable and necessary to characterize polyoxymethylene mouldingand extrusion materials are listed. The properties have been selected from the general testmethods in ISO 10350-1:1998. Other test methods inwide use for, or of part
20、icular significance to, these moulding and extrusion materials are alsoincluded in thispart of ISO9988 as designatoryproperties specified in ISO 9988-1: melt flow rate and tensile modulus. In order toobtain reproducibleand comparable test results,it is necessary to use the methodsof specimen prepara
21、tion and conditioning. The specimen dimensions and the test procedures are specified herein. Values determined will not necessarily be identical to those obtained using specimens of different dimensions orprepared using different procedures. 2 Conformance In Clause3, the year of the publication of e
22、ach normative reference has been specifically stated. In order tobe able to claim conformity with this part of ISO 9988, it is essential that the user use only those editions given,and not earlier or more recent editions. 3 NormativereferencesThe following referenced documents are indispensable for
23、the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenceddocument (including any amendments) applies.ISO 62:1999, Plastics Determination of water absorptionISO 75-2:2004, Plastics Determination of temperature o
24、f deflection under load Part 2: Plastics andeboniteISO 178:2001, Plastics Determination of flexural propertiesISO 179-1:2000, Plastics Determination of Charpy impact properties Part1: Non-instrumented impacttestBS EN ISO 9988-2:2015BS ISO 9988-2:2006ISO 9988-2:2006(E)2 ISO 2006 All rights reservedIS
25、O 180:2000, Plastics Determination of Izod impact strengthISO 291:1997, Plastics Standard atmospheres for conditioning and testingISO 294-1:1996, Plastics Injection moulding of test specimens of thermoplastic materials Part 1: Generalprinciples, and mouldingof multipurpose and bar testspecimensISO 2
26、94-3:2002, Plastics Injection moulding of test specimens of thermoplastic materials Part3: Small platesISO 294-4:2001, Plastics Injection moulding of test specimens of thermoplastic materials Part4:Determination of mouldingshrinkageISO 527-2:1993, Plastics Determination of tensile properties Part2:
27、Test conditions for moulding and extrusion plasticsISO 899-1:2003, Plastics Determination of creep behaviour Part1: Tensile creepISO 1133:2005, Plastics Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) of thermoplasticsISO 1183-1:2004, Plastics Methods for determini
28、ng the density of non-cellular plastics Part 1: Immersionmethod, liquid pyknometer method and titration methodISO 3167:2002, Plastics M ultipurpose testspecimensISO 10350-1:1998, Plastics Acquisition and presentation of comparable single-point data Part1: Moulding materialsISO 11357-3:1999/Amd1:2005
29、, Plastics Differential scanning calorimetry (DSC) Part3: Determination oftemperature and enthalpy of melting and crystallization Amendment 1ISO 11359-2:1999, Plastics Thermomechanical analysis (TMA) Part2: Determination of coefficient oflinear thermal expansion and glass transition temperatureIEC 6
30、0093:1980, Methods of test for volume resistivity and surface resistivity of solid electrical insulating materialsIEC 60112:2003, Method for the determination of the proof and the comparative tracking indices of solid insulating materialsIEC 60243-1:1998, Electrical strength of insulating materials
31、Test methods Part1: Tests at powerfrequenciesIEC 60250:1969, Recommended methods for the determination of the permittivity and dielectric dissipationfactor of electrical insulating materials at power, audio and radio frequencies including metre wavelengthsIEC 60296:2003, Fluids for electrotechnical
32、applications Unused mineral insulating oils for transformers and switchgear4 Preparation of test specimens4.1 General Specimens shall be prepared by injection moulding. It is essential that they are always prepared bythe sameprocedure, using the same processing conditions. The standard conditions ar
33、e given below. The material shall be kept in moisture-proof containers until it is required for use. BS EN ISO 9988-2:2015ISO 9988-2:2006(E)BS ISO 9988-2:2006ISO 9988-2:2006(E) ISO 2006 All rights reserved 34.2Treatment of the material before moulding No pretreatment of the material sample is normal
34、ly necessary before processing.NOTE POM moulding materials adsorb moisture on the surface of the particles, which may lead to surface defects inmoulded specimens. To assure mouldings are freeof surface defects, the material may be dried for a minimum of 4 hat80 C in a circulating air environment. 4.
35、3 Injectionmoulding Specimens shall be prepared in accordance with ISO294-1, ISO 294-3 or ISO 294-4, using the conditionsspecified in Table 1. Table 1 Conditions for injection moulding of test specimensMaterialMelttemperature C Mould temperature C Average injection velocitymm/s Homopolymer, MFR 7 15
36、 90 300 100 Homopolymer, impact-modified, MFR u 7 210 60 140 100 Copolymer, MFR 4 205 90 200 100 Copolymer, impact-modified 205 80 200 100 Copolymer, MFR 4 05 90 140 100 Copolymer, high modulus, MFR u 4 210 100 140 100 5 Conditioning of test specimens Test specimens shall be conditioned in accordanc
37、e with ISO291 for at least 16 h at (23 2) C and (50 5) % relative humidity. NOTE If test specimen conditioningand testing is in the sub-tropical atmosphere of 27C/65 % relativehumidityfound in ISO 291, then this is to be noted in the test report and the results may not be compared to those obtained
38、at thestandard specified conditioning temperature and humidity.6 Determination of properties In the determination of properties and the presentation of data, the standards, supplementary instructions and notes given in ISO 10350-1:1998 shall be applied. All tests shall be carried out in the standard
39、 atmosphere of (23 2) C and (50 5) % relative humidityunless specifically stated otherwise inTables 2 and 3. Table 2 is compiled fromISO 10350-1:1998 and the properties listed are those which are appropriate topolyoxymethylene moulding and extrusion materials. These properties are those considered u
40、seful forcomparisons of data generated for different thermoplastics.Table 3 containsthose properties, not found specificallyin ISO10350-1:1998, which are in wide use orof particular significance in the practical characterization of polyoxymethylene moulding and extrusion materials.These properties m
41、ay be based on specimens which are not listed in ISO10350-1:1998. Refer to Clause 5 if using a subtropical conditioning and testing atmosphere. BS EN ISO 9988-2:2015ISO 9988-2:2006(E)BS ISO 9988-2:2006ISO 9988-2:2006(E)4 ISO 2006 All rights reservedTable 2 General properties and test conditions (sel
42、ected from ISO 10350-1:1998)Property Unit Standard Specimen type(dimensions inmm) Test conditions andsupplementary instructions Rheological properties Melt mass-flow rateg/10 min Melt volume-flow ratecm3/10 min ISO 1133 Moulding compound Temperature 190 C, load 2,16 kgMechanical properties Tensile m
43、odulus Test speed 1 mm/min Yield stress MPaYield strainNominal strain at break% Test speed 50 mm/min Stress at breakMPa Strain at break %ISO 527-2 ISO 3167,type ATest speed 5 mm/min. Onlyto be quoted ifstrain at break is 10 %.At 1 hTensile creep modulus ISO 899-1 ISO 3167,type AAt 1000 h Strain u 0,
44、5 %Flexural modulusMPaISO 178 80 10 4 Test speed 2 mm/min Charpy impact strength 80 10 4 Charpy notched impact strength kJ/m2ISO 179-1 80 10 4 V-notchr = 0,25 (notch A)Method 1e (edgewise impact)Thermal properties Melting temperature C ISO 11357-3 Moulding compound Use 10 C/min.Temperature of deflec
45、tion under load C ISO 75-2 80 10 4 flatwiseMethod A (1,8 MPa) and method B(0,45 MPa) Parallel Coefficient oflinear thermalexpansion C1ISO 11359-2 Prepared fromISO 3167 NormalQuote the secant value over the temperature range 23 Cto 55 CElectrical properties Relative permittivity IEC 60250 60 60 2 Fre
46、quency 100 Hz and 1 MHz (compensate for electrode edge effect) Dissipation factor IEC 60250 60 60 2 Frequency 100 Hz and 1 MHz (compensate for electrode edge effect) Volume resistivity m IEC 60093 60 60 2 Voltage 500 VSurface resistivity IEC 60093 60 60 2 Voltage 500 VElectric strength kV/mmIEC 6024
47、3-1 60 60 2 Use 20 mm diameter sphericalelectrode configuration. Immerse in IEC 60296 transformer oil. Voltage rate 2 kV/s.Comparative tracking index IEC 60112 W15 W15 4 Use solution A.Other properties Water absorption %ISO 62 60 60 2 Saturation value in water at 23 CDensity kg/m3ISO 1183-1 10 10 4
48、Moulding shrinkage %ISO 294-4 60 60 2 Report shrinkage perpendicular and parallelto flow, post-moulding shrinkage and totalshrinkage.BS EN ISO 9988-2:2015ISO 9988-2:2006(E)BS ISO 9988-2:2006ISO 9988-2:2006(E) ISO 2006 All rights reserved 5Table 3 Additional properties and test conditions of particul
49、ar utility to polyoxymethylene moulding and extrusion materialsProperty Unit Standard Specimen type(dimensions inmm) Test conditions andsupplementary instructions Mechanical properties Izod impact strength, notched kJ/m2ISO 180 80 10 4 Method ANOTE At the next periodic review, consideration may be given to eliminating notched Izod. There has been sufficienttime to establish notched Charpy i
