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1、BRITISH STANDARD BS 5734-5: 1990 Polyester moulding compounds for electrical and other purposes Part 5: Specification for sheet moulding compounds for mechanical purposes Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-5:1990 This Br
2、itish Standard, having been prepared under the direction of the Plastics Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 31 October 1990 BSI 10-1999 First published August 1980 Second edition October 1990 The following BSI references relate
3、to the work on this standard: Committee reference PLM/38 Draft for comment 88/40658 DC ISBN 0 580 18906 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Plastics Standards Policy Committee (PLM/-) to Technical Committee PLM/38, upon whi
4、ch the following bodies were represented: BEAMA Ltd. British Marine Industries Federation British Plastics Federation British Resin Manufacturers Association British Telecommunications plc Chemical Industries Association EEA (the Electronics and Business Equipment Association) ERA Technology Ltd. El
5、ectrical and Electronic Insulation Association (BEAMA Ltd.) Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Federation of Resin Formulators and Applicators Ltd. Ministry of Defence Process Plant Association Society of British Aerospace Companies Limited Society of Chemical I
6、ndustry Standards Association of Australia Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-5:1990 BSI 10-1999i Contents Page Committees responsibleInside front cover Forewordii
7、 1Scope1 2Definitions1 3Classification1 4Composition1 5Preparation of test pieces1 6Conditioning of test pieces before testing1 7Properties1 8Mass per unit area and mass distribution2 9Glass content2 10Storage life2 11Marking2 Appendix A Test methods for additional properties that are subject to pur
8、chaser/supplier agreement3 Table 1 Properties1 Table 2 Test methods for additional properties that are subject to purchaser/supplier agreement3 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734
9、-5:1990 ii BSI 10-1999 Foreword This Part of BS 5734 has been prepared under the direction of the Plastics Standards Policy Committee and is a revision of BS 5734-5:1980, which is withdrawn. This Part of BS 5734 is the fifth in a series for polyester moulding compounds; the other Parts are as follow
10、s: Part 1: Methods of test; Part 2: Specification for dough moulding compounds for electrical purposes; Part 3: Specification for dough moulding compounds for mechanical purposes; Part 4: Specification for sheet moulding compounds for electrical purposes. In this revision the test methods have been
11、updated. The mechanical requirements in this Part are identical to those in Part 4 but this Part does not specify that the fibrous reinforcement be E-glass. The use of asbestos is excluded. The requirements for low profile grades are under consideration and it is planned to issue a supplement in due
12、 course to cater for this type of material. Given in Appendix A is a list of additional properties that may be the subject of purchaser/supplier agreements, together with appropriate test methods that can be used to assess compliance. Product certification. Users of this British Standard are advised
13、 to consider the desirability of third party certification of product conformity with this British Standard based on testing and continuing surveillance, which may be coupled with assessment of a suppliers quality systems against the appropriate Part of BS 5750. Enquiries as to the availability of t
14、hird party certification schemes will be forwarded by BSI to the Association of Certification Bodies. If a third party certification scheme does not already exist, users should consider approaching an appropriate body from the list of Association members. A British Standard does not purport to inclu
15、de all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. 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, pages
16、i and ii, pages 1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:31 GMT+00
17、:00 2006, Uncontrolled Copy, (c) BSI BS 5734-5:1990 BSI 10-19991 1 Scope This Part of BS 5734 specifies thermosetting polyester sheet moulding compounds which are classified according to their mechanical properties and may be further distinguished by their oxygen index. NOTE 1Appendix A lists furthe
18、r properties and appropriate test methods that may be specified by agreement between the purchaser and the supplier. NOTE 2The titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this Part of BS 5734, the following definition
19、s apply. 2.1 E-glass low alkali glass containing not more than 1 % of alkali metal oxides expressed as Na2O 2.2 batch a quantity of material so designated by the manufacturer and of uniform quality 3 Classification Requirements are specified for the following three types of sheet moulding compounds:
20、 S1: for mouldings with superior mechanical properties; S2: a general purpose material with good mechanical properties; S3: a general purpose material with lower mechanical properties. NOTECompounds may be further distinguished by their oxygen index if agreed between the purchaser and the supplier (
21、see Appendix A). 4 Composition The material shall consist of a chemically-thickened unsaturated polyester resin system, combined with fillers and fibrous reinforcement other than asbestos, which is supplied in sheet form and is capable of being cured by moulding under heat and pressure. 5 Preparatio
22、n of test specimens The moulding conditions shall be as given in Annex C of BS 2782:Method 902A. Unless otherwise stated in the test requirements, the test specimens shall be cut from a moulded sheet of the appropriate thickness, which shall have been made in a positive or semi-positive mould. 6 Con
23、ditioning of test specimens before testing Unless otherwise specified in the test method, condition the moulded test specimens for at least 16 h at a temperature of 23 2 C and ambient relative humidity before testing. 7 Properties The material, as supplied, shall comply with clauses 8 and 9. The mou
24、lded and conditioned materials (see clauses 5 and 6) shall comply with Table 1. NOTESee Appendix A for optional requirements that a purchaser may wish to specify. Table 1 Properties PropertyTest methodEquivalent international test method UnitLimitType S1S2S3 Flexural strengthMethod 8 of BS 5734-1:19
25、90 (see note 1) ISO 178MPamin.170135100 Impact strengthMethod 11 of BS 5734-1:1990 (see note 2) ISO 179kJ/m2min.604535 Flexural modulusMethod 10 of BS 5734-1:1990 (see note 1) ISO 178GPamin.10.08.07.0 NOTE 1Use “standard” test specimens and a rate of separation of the loading nose and supports of be
26、tween 4 mm/min and 6 mm/min. Use 12 test specimens. NOTE 2Use 12 unnotched test specimens of length 120 2 mm, breadth 15 0.5 mm, thickness 4 0.2 mm and test flatwise. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-5:1990 2 BSI 10-19
27、99 8 Mass per unit area and mass distribution When tested by the method described in method 1 of BS 5734-1:1990 the consistency of the unmoulded sheet shall comply with the following. a) The average mass per unit area of all test specimens taken from any strip across a roll shall not differ by more
28、than 12 % from the nominal value for the average mass per unit area which shall be declared by the manufacturer. b) The mass per unit area of individual test specimens taken from a single strip across the roll shall not differ from the mean value for all the test specimens taken from the same strip
29、by more than 10 % of the nominal value. 9 Glass content The glass content shall be declared by the manufacturer and when tested as described in method 2 of BS 5734-1:1990, shall be within 4 % of the declared value. NOTEFor example, for a declared value of 25 % the permitted range is 21 % to 29 %. 10
30、 Storage life The manufacturer shall state the storage life of the material when kept in the original unopened container under the conditions recommended by the manufacturer. Immediately after first opening the container, at any time within the stated storage life, the material shall be mouldable an
31、d shall comply with clause 7. 11 Marking Containers of material shall be marked clearly with the following information. a) manufacturers name or trade mark; b) material classification; c) batch number; d) mass per unit area (in g/m2); e) glass content; f) number and date of this British Standard, i.
32、e. BS 5734-5:19901). 1) Marking BS 5734-5:1990 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the responsibili
33、ty of the person making the claim. Such a declaration is not to be confused with third party certification of conformity, which may also be desirable. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-5:1990 BSI 10-19993 Appendix A Tes
34、t methods for additional properties that are subject to purchaser/supplier agreement Additional properties and their associated test methods, which are subject to purchaser/supplier agreement, are given in Table 2. Table 2 Test methods for additional properties that are subject to purchaser/supplier
35、 agreement PropertyTest methodUnitLimitType S1S2S3 Tensile strengthBS 2782:Method 320E (see note 1) MPamin.As agreed between purchaser and supplier Moulding shrinkageBS 2782:Method 640Amm/mmax.As agreed between purchaser and supplier Oxygen indexMethod 4 of BS 5734-1:1990 (see note 2) As agreed betw
36、een purchaser and supplier NOTE 1Use “standard” test specimens of thickness 4 0.2 mm and a rate of grip separation of 5 mm/min. End pieces may not be required. NOTE 2The test method described in method 4 of BS 5734-1:1990 is used primarily for the purpose of monitoring consistency of production of s
37、heet moulding compounds. Its use gives an indication of a suitable formulation which influences the performance of a moulded test specimen under the particular test conditions. In no circumstances should the test results thus obtained be considered as an overall indication of the potential fire haza
38、rd presented under the actual condition of use by products made from the sheet moulding compounds. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 blank Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:31 GMT+00:00 2006, Uncont
39、rolled Copy, (c) BSI BS 5734-5:1990 BSI 10-1999 Publications referred to BS 2782, Methods of testing plastics. BS 2782:Method 320A to 320F, Tensile strength, elongation and elastic modulus. BS 2782:Method 640A, Determination of shrinkage of test specimens in the form of bars of compression moulded t
40、hermosetting moulding materials. BS 2782:Method 902A, Compression moulding test specimens of thermosetting materials. BS 5734, Polyester moulding compounds for electrical and other purposes. BS 5734-1, Methods of test. BS 5734-2, Specification for dough moulding compounds for electrical purposes2).
41、BS 5734-3, Specification for dough moulding compounds for mechanical purposes2). BS 5734-4, Specification for sheet moulding compounds for electrical purposes2). BS 5750, Quality Systems2). ISO 178, Plastics Determination of flexural properties of rigid plastics3). ISO 179, Plastics Determination of
42、 Charpy impact resistance of rigid materials3). 2) Referred to in the foreword only. 3) Published by the International Organization for Standardization (ISO) and available from BSI Sales Department, Linford Wood, Milton Keynes MK14 6LE. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:31
43、 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-5: 1990 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It i
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