1、STD-BSI BS EN L842-ENGL 1777 m Lb24bb9 Ob593b4 TT4 m BS EN 1842 : 1997 BRITISH STANDARD Plastics - Thermoset moulding compounds (SMC - BMC) - Determination of compression moulding shrinkage BS EN 1842 : 1997 This Bntish Standard, having been prepared under the direction of the Sector Board for Maten
2、ais and Chemicals, was published under the authonty of the Standards Board and comes into effect on 15 November 1997 O BSI 1997 ISBN O 680 28664 9 National foreword This Bntish Standard is the English language version of EN 1842 : 1997. It is also for use for the revision or amendment of other natio
3、nal standards as practicable, but it should not be presumed to apply to any existing standard or specification which contains or makes reference to a different test method until that standadspecification has been amended or revised to make reference to this method and dust any requirements as approp
4、riate. Attention is drawn to the existence of BS 2782 : Methods of testing plastifi. Past 6 : Dimensional properties. Method 64OA : 1979 - Determination of sbinlcage of test specimens in the fomh of burs of compression moulded themnosetting modding materials, which is identical to and dual numbered
5、with IS0 2577. The text of IS0 2577 : 1975 was used as the basis for the preparation of this European Standasd. The UK participation in its preparation was entrusted to Technical Committee PRY42, Fibre reinforced thermo-setting plastics and prepregs, which has the responsibility to: - aid enquirers
6、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 list of organizations represented on thi
7、s committee can be obtained on request to its secretary. Cross-references The 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 Standards Correspondence Index, or
8、by using the Find facility of the BSI Standards Electronic Catalogue. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN tite page, pages 2 to 4, an inside back cover and
9、a back cover. Amendments issued since publication Amd-No. ID* I Text affected STD.BSI BS EN 1842-ENGLTT77-m Lb24bb906573bb 877 m EUROPEAN flANDARD NO= EUR0PEE”E EXJROPAISCHC NORM EN 1842 July 1997 ICs 83.080.10 Descriptors: Plastics, thermosetting resins, plastic moulding, compression moulding, test
10、s, determination, shrinkage Engush version Plastics - Thermoset moulding compounds (SMC - BMC) - Deternination of compression mouldmg shrrnkage Plastiques - Matires mouler thermodurcissables (SMC - BMC) - Dtrminon du retrait au moulage par compression Verarbeitungsschwindung Kunststoffe - Wrmehrtend
11、e Fomunassen (SMC - BMC) - Besmungen der This European Standard was approved by CEN on 1997-0629. CEN members are bound to comply with the CENKENELEC Inted Regdations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date
12、 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 in three official versions (English, French, German). A version in any other language made by translation under the r
13、esponsibility of a CEN member into its own language and notified to the Central Secretanat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg,
14、Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standar-tion Comit Europen de Normalisation Europisches Komitee fur Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1997 CEN - All rights of exploitation in any form and by any
15、 means reserved worldwide for CEN national Members. Ref. No. EN 1842 : 1997 E Page 2 EN 1842 : 1997 Foreword This European Standard has been prepared by Technical Committee CENnC 249, Plastics, the secretariat of which is held by IBN. This European Standard shd be given the status of a national stan
16、dard, either by publication of an identical text or by endorsement, at the latest by January 1998, and conflicting national standards shall be withdrawn at the latest by January 1998. According to the CENKENELEC Internal Regulations, the national standards organizations of the foliowing countries ar
17、e bound to implement this European Standard Austria, Belgium, Czech Republic, Denmark, Finland, France, Germanx Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norwax Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Foreword 1 Scope 2 Normative references 3 Definitions
18、 4 Apparatus 6 Sampling and conditioning of the mouldmg compound 6 Test specimens 7 Procedure 8 Expression of results 9 Test report 10 Precision Page 2 3 3 3 3 3 0 BSI 1997 STD.BSI BS EN L42-ENGL L777 Lb24bb7-b573b bliT D 1 Scope This European Standard specifies a method to determine the moulding sh
19、rinkage of compression moulded test specimens of thermoset moulding compounds. It applies only to mate - mould coverage: not less than 90 % for SMC. Moulding compounds like BMC shall be preformed to a homogeneous charge prior to moulding; - moulding pressure: 7 MPa f 5 % ; - Pressing time: 40 second
20、s per millimebe of thickness of moulded test specimen or for whatever longer time is necessary to ensure full cure. The mould shad be closed within 15 s after charging. On the moulded SMC test specimens, identa the production direction and/or unidirectional reinforcement direction if applicable. 7.3
21、 After removal from the mould, allow the test specimens to cool down to room temperature by placing them in the cooling rack (see 4.3). Store them at standard atmosphere for a minimum of 16 h, or for a shorter time providing it has been shown that it gives the same results. 7.4 For the determination
22、 of moulding shrinkage, measm at standard atmmpheq to the nearest 0,Ol mm, the length of the test specimens between opposite ends as LI. - With engraved gauge marks, measure the distance between the marks. - With draft angles at the ends of the test specimens, measure the length of the reference pla
23、ne (see note in 4.1). - Without draft angles, measure at any height the distance between opposite ends. Carry out one measurement per test specimen. 8 Expression of results The moulding shrinkage MS is given, as a percentage, by the formula: Ms = Le X 100 LO where Lo L1 is the reference length of th
24、e mould, in millimetres, determined as in 7.1; is the corresponding length of the test specimen in millimetres, according to 7.4. NOTE. A positive value (Lo - Li O) indicates a shrinkage of the material and a negative value (Lo - Li Fax: 0181 996 7400. BSI offers members an individual updating servi
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