1、BRITISH STANDARDBS EN ISO 294-2:1998BS 2782-9: Method 910C: 1997Implementing Amendment No. 1 to BS 2782-9: Method 910C:1997 (renumbers the BS as BS EN ISO 294-2:1998) not published separately and incorporating Amendment No. 1Plastics Injection moulding of test specimens of thermoplastic materials Pa
2、rt 2: Small tensile barsThe European Standard EN ISO 294-2:1998, with the incorporation of Amendment A1:2005, has the status of a British StandardICS 83.080.20BS EN ISO 294-2:1998This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was publ
3、ished under the authority of the Standards Board and comes into effect on 15 May 1997 BSI 2006ISBN 0 580 27298 2National forewordThis British Standard is the English language version of EN ISO 294-2:1998, including amendment A1:2005. It is identical with ISO 294-2:1996, including amendment 1:2004.Th
4、e start and finish of text introduced or altered by CEN amendment is indicated in the text by tags !“. Tags indicating changes to CEN text carry the number of the CEN amendment. For example, text altered by CEN amendment A1 is indicated by !“.The UK participation in its preparation was entrusted to
5、Technical Committee PRI/21, Testing of plastics, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related internatio
6、nal and European developments and promulgate them in the UK.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
7、BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for
8、 its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, page 2, the ISO title page, page ii, pages 1 and 2, an inside ba
9、ck cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date Comments10234 October 1998 Indicated by a sideline in the margin16121 28 April 2006 See national forewordBS EN ISO 294-2:1998 BSI
10、 2006 iContentsPageNational foreword Inside front coverForeword 2Foreword iiText of ISO 294-2 1iiblankEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 294-2July 1998+A1August 2005ICS 83.080.20Descriptors: See ISO documentEnglish versionPlastics Injection moulding of test specimens of thermoplas
11、tic materials Part 2: Small tensile bars(includes amendment A1:2005)(ISO 294-2:1996 + A1:2004)Plastiques Moulage par injection des prouvettes de matriaux thermoplastiques Partie 2: Barreaux de traction de petites dimensions (inclut lamendement A1:2005) (ISO 294-2:1996 + A1:2004)Kunststoffe Spritzgie
12、en von Probekrpern aus Thermoplasten Teil 2: Kleine Zugstbe (enthlt nderung A1:2005) (ISO 294-2:1996 + A1:2004)This European Standard was approved by CEN on 12 June 1998; amendment A1:2005 was approved by CEN on 8 August 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations
13、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 Central Secretariat or to any CEN member.This European S
14、tandard 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 Central Secretariat has the same status as the official versions.CEN members are the national st
15、andards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.CENEuropean
16、 Committee for StandardizationComit Europen de NormalisationEuropisches Komitee fr NormungCentral Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.Ref. No. EN ISO 294-2:1998 + A1:2005 EEN ISO
17、 294-2:1998 BSI 20062ForewordThe text of the International Standard from Technical Committee ISO/TC 61, Plastics, of the International Organization for Standardization (ISO) has been taken over as a European Standard by Technical Committee CEN/TC 249, Plastics, the Secretariat of which is held by IB
18、N.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 January 1999, and conflicting national standards shall be withdrawn at the latest by January 1999.According to CEN/CENELEC Internal Regulations, t
19、he following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.Endorsement noticeThe text of the I
20、nternational Standard ISO 294-2:1996 has been approved by CEN as a European Standard without any modification.NOTE Normative references to International Standards are listed in Annex ZA (normative).ContentsForeword 21Scope 12 Normative references 13 Definitions 14 Apparatus 15 Procedure 26 Report on
21、 test-specimen preparation 2Annex ZA (normative) Normative references to international publications with their relevant European publications Inside back coverFigure 1 Cavity plate for a type C ISO mould 1Foreword to amendment A1The text of ISO 294-2:1996/Amd 1:2004 has been prepared by Technical Co
22、mmittee ISO/TC 61, Plastics, of the International Organization for Standardization (ISO) and has been taken over as EN ISO 294-2:1998/A1:2005 by Technical Committee CEN/TC 249, Plastics, the secretariat of which is held by IBN.This European Standard shall be given the status of a national standard,
23、either by publication of an identical text or by endorsement, at the latest by February 2006, and conflicting national standards shall be withdrawn at the latest by February 2006.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bo
24、und 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, Slovakia, Slovenia, Spain, Sweden, Switzerland and Uni
25、ted Kingdom.Endorsement noticeThe text of ISO 294-2:1996/Amd 1:2004 has been approved by CEN as EN ISO 294-2:1998/A1:2005 without any modifications.EN ISO 294-2:1998EN ISO 294-2:1998ii BSI 2006ForewordISO (the International Organization for Standardization) is a worldwide federation of national stan
26、dards 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 org
27、anizations, 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.Draft International Standards adopted by the technical committees are c
28、irculated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.International Standard ISO 294-2 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 9, Thermoplastic materials.Together wit
29、h the other parts, this part of ISO 294 cancels and replaces the second edition of ISO 294 (ISO 294:1995) which has been revised to improve the definition of the injection-moulding parameters and has been restructured to specify four types of ISO mould for the production of the basic specimen types
30、required for the acquisition of comparable test data.Care has been taken to ensure that the ISO moulds described can all be fitted in existing injection-moulding equipment and have interchangeable cavity plates.ISO 294 consists of the following parts, under the general title Plastics Injection mould
31、ing of test specimens of thermoplastic materials: Part 1: General principles, and moulding of multipurpose and bar test specimens; Part 2: Small tensile bars; Part 3: Small plates; Part 4: Determination of moulding shrinkage;Foreword to ISO amendmentISO (the International Organization for Standardiz
32、ation) 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
33、 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 (IEC) on all matters of electrotechnical standardization.International Standards are draft
34、ed in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committee are circulated to the member bodies for voting. Publication as an International Standa
35、rd 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 document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.Amendment 1 to ISO 294-2:199
36、6 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 9, Thermoplastic materials.Descriptors: Plastics, thermoplastic resins, injection moulding, moulding materials, test specimens bars (materials), specimen preparation, reference data.EN ISO 294-2:1998 BSI 2006 11 ScopeThis par
37、t of ISO 294 specifies a four-cavity mould, the type C ISO mould, for the injection moulding of small tensile bars measuring 60 mm 10 mm 3 mm (the type 4 test specimen in ISO 8256:1990).2 Normative referencesThe following standards contain provisions which, through reference in this text, constitute
38、 provisions of this part of ISO 294. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 294 are encouraged to investigate the possibility of applying the most recent editions of the standards indic
39、ated below. Members of IEC and ISO maintain registers of currently valid International Standards.ISO 294-1:1996, Plastics Injection moulding of test specimens of thermoplastic materials Part 1: General principles, and moulding of multipurpose and bar test specimens. ISO 8256:1990, Plastics Determina
40、tion of tensile-impact strength. !ISO 11403-3:1999, Plastics Acquisition and presentation of comparable multipoint data Part 3: Environmental influences on properties“. 3 DefinitionsSee ISO 294-1:1996, clause 3.4 Apparatus4.1 Type C ISO mouldThe type C ISO mould is a four-cavity mould with a double-
41、T runner (see Figure 1) intended for the preparation of small tensile bars to be used for the measurement of so-called “indicative” properties when studying the effects of environmental influences, such as liquid chemicals, heat or weathering, on plastics (see ISO 11403-3). The bar mouldings produce
42、d using this mould shall have the dimensions of the type 4 specimen defined in ISO 8256:1990 plus a thickness of 3,0 mm 0,2 mm.Figure 1 Cavity plate for a type C ISO mouldEN ISO 294-2:19982 BSI 2006The main constructional details of the type C ISO mould shall be as shown in Figure 1 and shall meet t
43、he requirements given in ISO 294-1:1996, subclause 4.1.1.4, items a) to n), with the following exception:g) The dimensions of the test specimens refer to ISO 8256, i.e. the main dimensions, in millimetres, of the cavities shall be as follows: width of central section: 3,0 to 3,1; radius of curvature
44、: 15 to 16.! h) Ejector pins, if used, shall be located outside the test area of the specimen, i.e. at the shoulders of the dumbbell specimens.“The thickness of the test specimens shall be 3,0 mm 0,2 mm, i.e. the depth of the cavities shall be 3,0 mm to 3,2 mm.4.2 Injection-moulding machineSee ISO 2
45、94-1:1996, subclause 4.2, with the following exception:In subclause 4.2.4, the recommended minimum locking force FMfor the type C ISO mould is given by FM 5 500 pmax 103, i.e. 440 kN for a maximum melt pressure of 80 MPa.5 Procedure5.1 Conditioning of materialSee ISO 294-1:1996, subclause 5.1.5.2 In
46、jection mouldingSee ISO 294-1:1996, subclause 5.2, but with the following new text for subclause 5.2.2.For the type C ISO mould, it is recommended that the injection velocity v1be chosen such that the injection time t1is comparable to that used for the type A ISO mould.NOTE 1 The cavities in the typ
47、e C ISO mould have a low critical cross-sectional area ACof only 9 mm2, i.e. much lower than that for the type A ISO mould (40 mm2). If the same injection speed v1were used for the type C mould as for the type A mould, this would result in a low screw advance speed and hence a low melt speed in the
48、runners and a low melt temperature before the melt enters the cavities of the type C mould. Using the recommended common injection time t1, however, the injection velocity v1for the type C mould is about twice that recommended for the type A mould see ISO 294-1:1996, equation (3).NOTE 2 This part of
49、 ISO 294 does not address the question of changes in screw advance speed, e.g. high speeds when filling the runners and low speeds when filling the cavities. As a result of the inertia of the injection-moulding machine, peaks in melt pressure and/or injection speed often cannot be avoided if the screw advance speed is changed during injection.6 Report on test-specimen preparationThe report shall include the following information:a) a reference to this part of ISO 294;b) to h): see ISO 294-1:1996, clause 6, items b) to h
