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1、 ，如果你需要更多标准可以到 如果你购买的文档存在缺页、字迹模糊、乱码等情况，请大家通过论坛消息与我联系。BRITISH STANDARDPlastics Fibre reinforced composites Preparation of compression moulded test plates of SMC, BMC and DMCThe European Standard EN 12576:1998 has the status of aBritish StandardICS 83.120; 83.140.10| BS EN12576:1998|NO COPYING WITHOUT
2、 BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 12576:1998National forewordThis British Standard is the English language version of EN 12576:1998.The UK participation in its preparation was entrusted to Technical Committee PRI/42, Fibre reinforced thermosetting plastics and prepregs, which
3、 has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK.A li
4、st 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 section entitled International
5、 Standards Correspondence Index, or by using theFind 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 application.Compliance with a British Standa
6、rd does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 5 and a back cover.Amd. No.DateText affectedThis British Standard, having been prepared under the direction of the Sector Committee
7、 for Materials and Chemicals, was published under the authority of the StandardsCommittee and comes into effect on 15 November 1998BSI 1998ISBN 0 580 30021 8Amendments issued since publicationEUROPEAN STANDARDEN 12576NORME EUROPE ENNEEUROPA ISCHE NORMMay 1998ICS 83.120; 83.140.10Descriptors: Plastic
8、s, reinforced plastics, plastic moulding, reinforcing materials, thermosetting resins, composition: property, specimen preparation, plates, dimensions, proceduresEnglish versionPlastics Fibre reinforced composites Preparation of compression moulded test plates of SMC, BMC and DMCPlastiques Composite
9、s renforce s de fibres Pre paration de plaque dessais de SMC, BMC et DMC pour moulage par compressionKunststoffe Fasversta rkte Verbundwerkstoffe Herstellung von formgepreten Pru fplatten aus SMC, BMC und DMCThis European Standard was approved by CEN on 1 May 1998.CEN members are bound to comply wit
10、h 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 Central Secretari
11、at 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 Central Secretariat has the same status as the official ve
12、rsions.CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.CENEuropean Committee for Standardization Comite Europe en de Normali
13、sation Europa isches Komitee fu r NormungCentral Secretariat: rue de Stassart 36, B-1050 Brussels1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN nationalMembers.Ref. No. EN 12576:1998 EPage 5EN 12576:1998BSI 1998ForewordThis European Standard has been prep
14、ared byTechnical Committee CEN/TC 249, Plastics, theContentsPageSecretariat of which is held by IBN.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 byNovember 1998, and conflicting national standards
15、 shall be withdrawn at the latest by November 1998.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, I
16、reland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.Compression moulding of SMC, BMC and DMC differs from all other compression mouldable reinforced thermoset materials. Because of the flowing characteristic of the reinforcing fibres and the ty
17、pical maturation process before moulding, a particular manufacturing method is specified for the fabrication of test plates.Foreword 21Scope 32Normative references 33Definitions 34Health and safety 35Plate dimensions 36Apparatus and equipment 37Sampling and conditioning 48Procedure 49Stabilization 4
18、10Manufacturing report 411Precision 4Annex A (informative) Bibliography 5Annex B (informative) Applicable testmethods51 ScopeThis European Standard specifies the general principles and procedures for the preparation of compression moulded test plates from fibre reinforced thermosetting moulding comp
19、ounds such as sheet moulding compound (SMC), bulk moulding compound (BMC) and dough moulding compound (DMC).The purpose of this European Standard is to specify the preparation of flat test plates from which test specimens can be machined (for applicable test purposes see informative annex A). Test p
20、lates are being manufactured to give representative results by the different test procedures using specimens machined out of these test plates.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are c
21、ited at the appropriate places in the text and publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard onlywhen incorporated in it by amendment or revision. For undated references the latest edition o
22、f the publication referred to applies.EN 1842, Plastics Thermoset moulding compounds (SMC BMC) Determination of compression moulding shrinkage.EN ISO 12115:1997, Fibre-reinforced plastics Thermosetting moulding compounds and prepregs Determination of flowability, maturation and shelf life (ISO 12115
23、:1997).ISO 472, Plastics Vocabulary.ISO 8604, Plastics Prepregs Definitions of terms and symbols for designations.3 DefinitionsFor the purposes of this European Standard the terms and definitions given in ISO 472 and ISO 8604 apply with the addition of the following definitions.3.1pressing timeperio
24、d during a press cycle in which the mould is closed, and the required pressure is reached3.2elementary unitsmallest normally commercially available entity of a given productNOTE The description (form, dimensions, mass, etc.) of the elementary unit will normally be defined in the product specificatio
25、n. Elementary unit can be supplied in the form of rolls or packages for instance.For a given product, the dimensions, mass or volume of the elementary unit can change, as manufacturing techniques evolve, without necessarily causing any modification in the properties of the product or the way in whic
26、h these properties vary within the elementary unit4 Health and safetyThis European Standard limits itself to describing the preparation of compression moulded test plates. The handling conditions of the products and materials used shall comply with the national regulations in force in each country a
27、nd the staff shall be informed of the risks involved and appropriate precautions taken.5 Plate dimensionsIt is recommended to compression mould a plate of about 200 mm 3 590 mm (see also Method II inEN ISO 12115). If no suitable mould is available a plate with a minimum area of 450 cm2 shall be prod
28、uced to achieve at least five test specimensof 20 mm 3 250 mm.Most of the test procedures for SMC, BMC and DMC require a thickness of the test specimen of about 4 mm. For particular test methods the moulded plateaccording to EN 1842 could also be used.6 Apparatus and equipment6.1 PressTest plates ca
29、n be moulded on any hydraulic moulding press which complies with the following conditions: maintaining the specified pressure within 5% during pressing time; capable of being closed within 15 s prior to pressure build up.6.2 MouldA mould for compression moulding shall be able to withstand the specif
30、ied temperatures and pressures. The mould design shall ensure the entire force is applied to the moulding material. The mould cavityshall be flat and have an area of 450 cm2 as a minimum(see also 5.22 of EN ISO 12115:1997 concerningMethod II).6.3 Cooling rackA nonmetallic cooling rack to hold sample
31、s vertically with a minimum spacing of 20 mm and two additional protective plates.To achieve symmetrical cooling for all test plates the outer lateral test plates shall be protected by additional protective plates.7 Sampling and conditioningAn SMC sample shall be taken out of an elementary unit and
32、of full width. The width shall be reduced from both sides by 5 cm each to prevent edge influences of the production process.From BMC or DMC a sample shall be taken out of the centre of an elementary unit. Immediately after sampling the material shall be protected by an appropriate bag to avoid varia
33、tions of volatile contents and moisture absorption.Samples shall be conditioned to establish temperature equilibrium before moulding by placing them into a room with a temperature of 23 8C2 8C.8 Procedure8.1 Preparation of chargeThe mould coverage for SMC shall not be lessthan 90 % based on the tota
34、l cavity area, unless other levels of the mould coverage are specified. The SMC charge is prepared by stacking the necessary numberof SMC layers. To prevent orientation of fibres both the length and the width are reduced in case of notusing 100 % coverage. The reduction of length and width is of the
35、 same ratio. The stacked layers (SMC charge) shall be weighed and moulded immediately after preparation of the charge.Moulding materials like BMC and DMC shall be preformed to a homogenous charge prior to moulding by shaping and dispersing as even as possible into an appropriate geometry on a flat t
36、ray and then directly loaded into the open mould.NOTE In the case of not being able to apply the provisionsof 8.1 the top layer of the SMC charge can be of a smaller size compared to the others; the reduction of the size being perpendicular to the orientation of the test piece machined from the test
37、 plate.8.2 Moulding conditionsThe mould temperature shall be 140 3 (1 2 %) 8C, unless other conditions are specified or agreedbetween user and supplier. The moulding material shall be put into the open mould and the mould shall be closed within 15 s.According to the type of material the pressure to
38、be applied as well as the pressing time shall follow the respective material specification.8.3 Moulding procedure8.3.1 Select the moulding conditions to be used.8.3.2 Prepare the charge to obtain the specified thickness of the flat test plate according to 8.1.8.3.3 Weigh the material.8.3.4 Load the
39、prepared charge into the centre of the mould cavity and close the press. Check if closing time is within the specification. After closing, and as soonas the specified pressure is reached, the pressing time measurement shall start.8.3.5 When the pressing time is completed, open the press, remove the
40、moulded part and place it into the cooling rack for cooling to room temperature.8.3.6 Check that the moulding is satisfactory and does not exhibit any faults which might affect further testing operations.8.3.7 Measure the thickness.9 StabilizationUnless otherwise stated, it is recommended to keep th
41、e test plates for 48 h in the laboratory atmosphere before cutting the test specimens from the manufactured plates. The conditioning of test specimens is given in the particular testing standard.10 Manufacturing reportThe report shall include the following details: reference to this European Standar
42、d; complete identification of the material tested, including at least type, source, manufacturers name and designation; date of manufacturing; number of elementary units; type of press; type and size of mould used; description of charge (length, width, weight and number of SMC layers, weight of BMC/
43、DMC; moulding conditions (temperature, pressure, pressing time); number and thickness of test plates; observations on any circumstances liable to influence the moulding results.11 PrecisionThe precision of this procedure is not known because interlaboratory data are not available. When interlaborato
44、ry data are obtained, a precision statement will be added with the next revision.Annex A (informative) BibliographyEN ISO 12114, Fibre-reinforced plastics Thermosetting moulding compounds and prepregs Determination of cure characteristics(ISO 12114:1997).ISO 295, Plastics Compression moulding of test specimens of thermosetting materials.Annex B (informative) Applicable test methodsTest specimens machined out of test plates according to this European Standard, can be used
