1、BRITISH STANDARD BS5734-5: 1990 Polyester moulding compounds for electrical and other purposes Part5: Specification for sheet moulding compounds for mechanical purposesBS5734-5:1990 This British Standard, having been prepared under the directionof the Plastics StandardsPolicy Committee, waspublished
2、 under the authorityof the Board of BSI andcomes into effect on 31 October1990 BSI10-1999 First published August1980 Second edition October1990 The following BSI references relate to the work on this standard: Committee reference PLM/38 Draft for comment88/40658DC ISBN 0 580 18906 6 Committees respo
3、nsible 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 which the following bodies were represented: BEAMA Ltd. British Marine Industries Federation British Plastics Federation Brit
4、ish Resin Manufacturers Association British Telecommunications plc Chemical Industries Association EEA (the Electronics and Business Equipment Association) ERA Technology Ltd. Electrical and Electronic Insulation Association (BEAMA Ltd.) Electrical Installation Equipment Manufacturers Association (B
5、EAMA Ltd.) Federation of Resin Formulators and Applicators Ltd. Ministry of Defence Process Plant Association Society of British Aerospace Companies Limited Society of Chemical Industry Standards Association of Australia Amendments issued since publication Amd. No. Date CommentsBS5734-5:1990 BSI 10-
6、1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Classification 1 4 Composition 1 5 Preparation of test pieces 1 6 Conditioning of test pieces before testing 1 7 Properties 1 8 Mass per unit area and mass distribution 2 9 Glass content 2 10 Stora
7、ge life 2 11 Marking 2 Appendix A Test methods for additional properties that are subject to purchaser/supplier agreement 3 Table 1 Properties 1 Table 2 Test methods for additional properties that are subject to purchaser/supplier agreement 3 Publications referred to Inside back coverBS5734-5:1990 i
8、i BSI 10-1999 Foreword This Part of BS5734 has been prepared under the direction of the Plastics Standards Policy Committee and is a revision of BS5734-5:1980, which is withdrawn. This Part of BS5734 is the fifth in a series for polyester moulding compounds; the other Parts are as follows: Part1: Me
9、thods of test; Part2: Specification for dough moulding compounds for electrical purposes; Part3: Specification for dough moulding compounds for mechanical purposes; Part4: Specification for sheet moulding compounds for electrical purposes. In this revision the test methods have been updated. The mec
10、hanical requirements in this Part are identical to those in Part4 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 course to cater
11、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 to consider the
12、desirability of third party certification of product conformity with this BritishStandard based on testing and continuing surveillance, which may be coupled with assessment of a suppliers quality systems against the appropriate Part of BS5750. Enquiries as to the availability of third party certific
13、ation 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 include all the necessar
14、y 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, pagesi andii, pages1 to4,
15、 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.BS5734-5:1990 BSI 10-1999 1 1 Scope This Part of BS5734 specifies thermosetting polyester shee
16、t moulding compounds which are classified according to their mechanical properties and may be further distinguished by their oxygen index. NOTE 1Appendix A lists further properties and appropriate test methods that may be specified by agreement between the purchaser and the supplier. NOTE 2The title
17、s of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this Part of BS5734, the following definitions apply. 2.1 E-glass low alkali glass containing not more than1% of alkali metal oxides expressed as Na 2 O 2.2 batch a quantity of m
18、aterial so designated by the manufacturer and of uniform quality 3 Classification Requirements are specified for the following three types of sheet moulding compounds: S1: for mouldings with superior mechanical properties; S2: a general purpose material with good mechanical properties; S3: a general
19、 purpose material with lower mechanical properties. NOTECompounds may be further distinguished by their oxygen index if agreed between the purchaser and the supplier (seeAppendix A). 4 Composition The material shall consist of a chemically-thickened unsaturated polyester resin system, combined with
20、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 Preparation of test specimens The moulding conditions shall be as given in Annex C of BS2782:Method902A. Unless otherwise stated in the test req
21、uirements, 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 Conditioning of test specimens before testing Unless otherwise specified in the test method, condition the moulded test specimens for at le
22、ast16h at a temperature of23 2 C and ambient relative humidity before testing. 7 Properties The material, as supplied, shall comply with clauses8 and9. The moulded and conditioned materials (see clauses5 and6) shall comply with Table 1. NOTESee Appendix A for optional requirements that a purchaser m
23、ay wish to specify. Table 1 Properties Property Test method Equivalent international test method Unit Limit Type S1 S2 S3 Flexural strength Method8 of BS5734-1:1990 (see note1) ISO178 MPa min. 170 135 100 Impact strength Method11 of BS5734-1:1990 (see note2) ISO179 kJ/m 2 min. 60 45 35 Flexural modu
24、lus Method10 of BS5734-1:1990 (see note1) ISO178 GPa min. 10.0 8.0 7.0 NOTE 1Use “standard” test specimens and a rate of separation of the loading nose and supports of between4mm/min and6mm/min. Use12 test specimens. NOTE 2Use12 unnotched test specimens of length120 2mm, breadth15 0.5mm, thickness4
25、0.2mm and test flatwise.BS5734-5:1990 2 BSI 10-1999 8 Mass per unit area and mass distribution When tested by the method described in method1 of BS5734-1:1990 the consistency of the unmoulded sheet shall comply with the following. a) The average mass per unit area of all test specimens taken from an
26、y strip across a roll shall not differ by more 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
27、 the test specimens taken from the same strip 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 method2 of BS5734-1:1990, shall be within 4% of the declared value. NOTEFor example, for a declared value of25%
28、 the permitted range is21% to29%. 10 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
29、, the material shall be mouldable and shall comply with clause7. 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 (ing/m 2 ); e) glass content; f) number a
30、nd date of this British Standard, i.e.BS5734-5:1990 1) . 1) Marking BS5734-5:1990 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
31、 therefore solely the responsibility 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.BS5734-5:1990 BSI 10-1999 3 Appendix A Test methods for additional properties that are subject to purchaser/supplier
32、 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 agreement Property Test method Unit Limit Type S1 S2 S3 Tensile strength
33、BS2782:Method320E (see note1) MPa min. As agreed between purchaser and supplier Moulding shrinkage BS2782:Method640A mm/m max. As agreed between purchaser and supplier Oxygen index Method4 of BS5734-1:1990 (see note2) As agreed between purchaser and supplier NOTE 1Use “standard” test specimens of th
34、ickness4 0.2mm and a rate of grip separation of5mm/min. End pieces may not be required. NOTE 2The test method described in method4 of BS5734-1:1990 is used primarily for the purpose of monitoring consistency of production of sheet moulding compounds. Its use gives an indication of a suitable formula
35、tion 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 hazard presented under the actual condition of use by products made from the s
36、heet moulding compounds.4 blankBS5734-5:1990 BSI 10-1999 Publications referred to BS2782, Methods of testing plastics. BS2782:Method320A to320F, Tensile strength, elongation and elastic modulus. BS2782:Method640A, Determination of shrinkage of test specimens in the form of bars of compression moulde
37、d thermosetting moulding materials. BS2782:Method902A, Compression moulding test specimens of thermosetting materials. BS5734, Polyester moulding compounds for electrical and other purposes. BS5734-1, Methods of test. BS5734-2, Specification for dough moulding compounds for electrical purposes 2) .
38、BS5734-3, Specification for dough moulding compounds for mechanical purposes 2) . BS5734-4, Specification for sheet moulding compounds for electrical purposes 2) . BS5750, Quality Systems 2) . ISO178, Plastics Determination of flexural properties of rigid plastics 3) . ISO179, Plastics Determination
39、 of Charpy impact resistance of rigid materials 3) . 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 MK146LE.BS5734-5: 1990 BSI 389 Chiswick High Road London W4 4AL BSIB
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