1、BRITISH STANDARDBS EN ISO 8257-2:2006IncorporatingAmendment No. 1(renumbers BS ISO 8257-2:2001 as BS EN ISO 8257-2:2006)Plastics Poly(methyl methacrylate) (PMMA) moulding and extrusion materials Part 2: Preparation of test specimens and determination of propertiesThis European Standard EN ISO 8257-2
2、:2006 has the status of a British StandardICS 83.080.20BS EN ISO 8257-2:2006This British Standard, having been prepared under the direction of the Materials and Chemicals Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 01 Febr
3、uary 2002 BSI August 2006ISBN 0 580 38960 XNational forewordThis British Standard is the offical English language version of EN ISO 8257-2:2006. It is identical with ISO 8257-2:2001.The UK participation in its preparation was entrusted to Technical Committee PRI/82, Thermoplastic Materials, which ha
4、s the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the s
5、ection entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue.A British standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applicatio
6、ns.Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor
7、 related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, the ISO title page, pages iv to vi, pages 1 to 6, an inside back cover and a back cover.The BSI copyright date displayed in
8、this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date Comments16026 August 2006 Renumbers BS ISO 8257-2:2001 as BS EN ISO 8257-2:2006EUROPEAN STANDARDNORME EUROPENNE EUROPISCHE NORMEN ISO 8257-2April 2006ICS 83.080.20English VersionPlastics - Poly
9、(methyl methacrylate) (PMMA) moulding andextrusion materials - Part 2: Preparation of test specimens and determination of properties (ISO 8257-2:2001)Plastiques - Poly (mthacrylate de mthyle) (PMMA) pourmoulage et extrusion - Partie 2: Preparation desprouvettes et dtermination des proprietes (ISO 82
10、57-2:2001)Kunststoffe - Polymelhylmethacrylat (PMMA)-Formmassen- Teil 2: Herstellung von Probekrpern und Bestimmung derEigenschaften (ISO 8257-2:2001)This European Standard was approved by CEN on 16 March 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate
11、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 Central Secretariat or to any CEN member,This European Standard exists i
12、n three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions.CEN members are the national standards bodies of
13、 Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.Management Centre:
14、rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGRef. No. EN ISO 8257-2:2006: EForewordThe text of ISO 8257
15、-2:2001 has been prepared by Technical Committee ISO/TC 61 “Plastics“of the International Organization for Standardization (ISO) and has been taken over as EN ISO8257-2:2006 by Technical Committee CEN/TC 249“Plastics“, the secretariat of which is held byIBN.This European Standard shall be given the
16、status of a national standard, either by publication ofan identical text or by endorsement, at the latest by October 2006, and conflicting nationalStandards shall be withdrawn at the latest by October 2006.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
17、 following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia
18、, Spain, Sweden, Switzerland and United Kingdom. Endorsement noticeThe text of ISO 8257-2:2001 has been approved by CEN as EN ISO 8257-2:2005 without anymodifications.EN ISO 8257-2:2005 (E)INTERNATIONALSTANDARDISO8257-2Second edition2001-12-15Reference numberISO 8257-2:2001(E)Plastics Poly(methyl me
19、thacrylate)(PMMA) moulding and extrusionmaterials Part 2:Preparation of test specimens anddetermination of propertiesPlastiques Poly(mthacrylate de mthyle) (PMMA) pour moulage etextrusion Partie 2: Prparation des prouvettes et dtermination des propritsEN ISO 8257-2:2006iiiEN ISO 8257-2:2006ivContent
20、s Page1 Scope . 12 Conformance 13 Normative references . 14 Preparation of test specimens 25 Conditioning 46 Determination of properties 5EN ISO 8257-2:2006viForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISOmember bodies). Th
21、e work of preparing International Standards is normally carried out through ISO technical com-mittees. Each member body interested in a subject for which a technical committee has been established has theright to be represented on that committee. International organizations, governmental and non-gov
22、ernmental, in liai-son with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission(IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.Dr
23、aft International Standards adopted by the technical committees are circulated to the member bodies for voting.Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this part
24、of ISO 8257 may be the subject of patentrights. ISO shall not be held responsible for identifying any or all such patent rights.International Standard ISO 8257-2 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 9,Thermoplastic materials.This second edition cancels and replace
25、s the first edition (ISO 8257-2:1990), which has been technically revised.ISO 8257 consists of the following parts, under the general title Plastics Poly(methyl methacrylate) (PMMA)moulding and extrusion materials: Part 1: Designation system and basis for specifications Part 2: Preparation of test s
26、pecimens and determination of propertiesINTERNATIONAL STANDARD EN ISO 8257-2:20061Plastics Poly(methyl methacrylate) (PMMA) moulding andextrusion materials Part 2:Preparation of test specimens and determination of properties1 Scope1.1 This part of ISO 8257 specifies procedures for moulding test spec
27、imens of PMMA materials in a specified state,and methods for measuring their properties. Any property listed in this part of ISO 8257 and referred to in combina-tion with ISO 8257-1 shall be determined by the method referred to in this part of ISO 8257.1.2 No values are quoted for these properties.
28、Those required for the designation of PMMA materials for mouldingand extrusion are given in ISO 8257-1. Other properties shall be determined by the appropriate methods referred toin this part of ISO 8257.1.3 The values determined in accordance with this part of ISO 8257 will not necessarily be ident
29、ical to those ob-tained using specimens of different dimensions and/or prepared by different procedures. They may also be influ-enced by colorants and other additives. The values obtained for the properties of a moulding depend on the mouldingcompound, the shape of test specimen, the test method and
30、 the state of anisotropy. The last-mentioned depends onthe gating and the moulding conditions, for example temperature, pressure or injection rate. Any subsequent treat-ment must also be considered, for example conditioning or annealing.1.4 The thermal history and the internal stresses of the specim
31、ens may strongly influence thermal and mechanicalproperties and resistance to environmental stress cracking, but exert less effect on the electrical properties, whichmainly depend on the chemical composition of the moulding compound.2 ConformanceIn clause 3, the year of publication of each normative
32、 reference has been specifically stated. In order to be able toclaim conformity with this part of ISO 8257, it is essential that the user use only those editions given, and not earlieror more recent editions.3 Normative referencesThe following normative documents contain provisions which, through re
33、ference in this text, constitute provisions ofthis part of ISO 8257. For dated references, subsequent amendments to, or revisions of, any of these publications donot apply. For undated references, the latest edition of the normative document referred to applies. Members of ISOand IEC maintain regist
34、ers of currently valid International Standards.ISO 62:1999, Plastics Determination of water absorptionISO 75-2:1993, Plastics Determination of temperature of deflection under load Part 2: Plastics and eboniteISO 175:1999, Plastics Methods of test for the determination of the effects of immersion in
35、liquid chemicalsISO 178:1993, Plastics Determination of flexural propertiesISO 179:1993, Plastics Determination of Charpy impact strengthEN ISO 8257-2:20062ISO 180:1993, Plastics Determination of Izod impact strengthISO 294-1:1996, Plastics Injection moulding of test specimens of thermoplastic mater
36、ials Part 1: General prin-ciples, and moulding of multipurpose and bar test specimensISO 306:1994, Plastics Thermoplastic materials Determination of Vicat softening temperature (VST)ISO 489:1999, Plastics Determination of refractive indexISO 527-2:1993, Plastics Determination of tensile properties P
37、art 2: Test conditions for moulding and extrusionplasticsISO 604:1993, Plastics Determination of compressive propertiesISO 1133:1997, Plastics Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) ofthermoplasticsISO 1183:1987, Plastics Methods for determining the densit
38、y and relative density of non-cellular plasticsISO 1628-6:1990, Plastics Determination of viscosity number and limiting viscosity number Part 6: Methylmethacrylate polymersISO 2039-1:1993, Plastics Determination of hardness Part 1: Ball indentation methodISO 2039-2:1987, Plastics Determination of ha
39、rdness Part 2: Rockwell hardnessISO 3167:1993, Plastics Multipurpose test specimensISO 6721-2:1994, Plastics Determination of dynamic mechanical properties Part 2: Torsion-pendulum methodISO 8257-1:1998, Plastics Poly(methyl methacrylate) (PMMA) moulding and extrusion materials Part 1: Desig-nation
40、system and basis for specificationsISO 10350-1:1998, Plastics Acquisition and presentation of comparable single-point data Part 1: Moulding ma-terialsISO 13468-1:1996, Plastics Determination of the total luminous transmittance of transparent materials Part 1:Single-beam instrument4 Preparation of te
41、st specimens4.1 GeneralIt is essential that specimens are always prepared by the same procedure, using the same processing conditions.The procedures to be used depend on the PMMA material concerned and are indicated in the following subclauses.4.2 Treatment of the material before mouldingBefore proc
42、essing, the moulding compound shall be predried for in an oven at . In cases of dispute, themanufacturers instructions shall be followed.24 h 80CEN ISO 8257-2:200634.3 Moulding of specimens4.3.1 General requirementsThe specimens shall be prepared by injection moulding in accordance with ISO 294-1, u
43、sing the conditions specifiedin 4.3.2 to 4.3.6.4.3.2 Melt temperature4.3.2.1 GeneralPMMA moulding compounds are designated using a code-number representing the value of the Vicat softening tem-perature (VST), a code-number representing the value of the melt mass-flow rate (MFR) and, optionally, a co
44、de-number representing the value of the viscosity number (VN). For details of this designation system, in particular thecode-numbers used, see ISO 8257-1. In those cases where the designation only includes code-numbers for VSTand MFR, the melt temperature used for moulding test specimens may be dete
45、rmined from the MFR code-number(see 4.3.2.2). If the code-number for VN is also used in the designation, the melt temperature may also be deter-mined from the VST and VN code-numbers (see 4.3.2.3). It should be noted that, for moulding compounds with MFRvalues lying between (code-number 015) and (co
46、de-number 120), there is little difference inthe melt temperatures calculated from the MFR code-number and those calculated from the VST and VN code-num-bers. However, for moulding compounds outside this range, the melt temperature shall be determined only from theVST and VN code-numbers.When prepar
47、ing specimens, the melt temperature shall be kept constant to within .4.3.2.2 Melt temperature determined from MFR code-numberSelect the appropriate melt temperature from Table 1.EXAMPLEMoulding-compound designation: ISO 8257-PMMA,MLN,108-030Melt temperature =Table 1 Melt temperature as a function o
48、f MFR code-numberMFR code-numberMelt temperature005 270015 260030 250060 240120 230240 2201 g/10 min 16 g/10 min3CC250CEN ISO 8257-2:200644.3.2.3 Melt temperature determined from VST and VN code-numbersCalculate the melt temperature, in degrees Celsius, from the equationMelt temperature = VST code-n
49、umberwhere is a number which depends on the VN code-number as shown in Table 3.EXAMPLEMoulding-compound designation: ISO 8257-PMMA,MLN,108-030-53Melt temperature =4.3.3 Mould temperatureCalculate the mould temperature, in degrees Celsius, from the equationMould temperature = VST code-number 40The mould temperature shall be kept constant to within .EXAMPLEMoulding-compound designation: ISO 8257-PMMA,MLN,108-030-53Mould temperature =4.3.4
