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1、BRITISH STANDARD BS 5734-4: 1990 Polyester moulding compounds for electrical and other purposes Part 4: Specification for sheet moulding compounds for electrical purposes Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:56:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-4:1990 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 12-1999 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 88/40657 DC ISBN 0 580 18905 8 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, Fri Dec 01 14:56:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-4:1990 BSI 12-1999i Contents Page Committees responsibleInside front cover Forewordii
7、 1Scope1 2Definitions1 3Classification1 4Composition1 5Preparation of test specimens1 6Conditioning of test specimens before testing1 7Properties1 8Mass per unit area and mass distribution1 9Glass content1 10Storage life2 11Marking2 Appendix A Test methods for additional properties that are subject
8、to purchaser/supplier agreement3 Appendix B Determination of water absorption3 Appendix C Determination of resistance to tracking: simplified proof test for quality control purposes4 Appendix D Determination of flexural strength at elevated temperature4 Table 1 Properties2 Table 2 Test methods for a
9、dditional properties that are subject to purchaser/supplier agreement3 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:56:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-4:1990 ii BSI 12-1999 Foreword This Part of BS 5734 has been prepared un
10、der the direction of the Plastics Standards Policy Committee and is a revision of BS 5734-4:1980, which is withdrawn. This Part of BS 5734 is the fourth in a series for polyester moulding compounds; the other Parts are as follows: Part 1: Methods of test; Part 2: Specification for dough moulding com
11、pounds for electrical purposes; Part 3: Specification for dough moulding compounds for mechanical purposes; Part 5: Specification for sheet moulding compounds for mechanical purposes. Part 4 deals with electrical grades of sheet moulding compounds which are classified into three types according to t
12、heir mechanical properties and may be further distinguished by their oxygen index. In this revision the test methods have been updated. The mechanical requirements in this Part are identical to those in Part 5 but additional tests for material used for electrical purposes are specified. It should be
13、 noted that this specification requires the fibrous reinforcement to be E-glass, whereas BS 5734-5 does not do so. 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 compli
14、ance. Product certification. Users of this British Standard are advised 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
15、 the appropriate Part of BS 5750. Enquiries as to the availability of third 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 li
16、st of Association members. 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 Standard does not of itself confer immunity from legal obligations. Summary of pag
17、es This document comprises a front cover, an inside front cover, pages 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.
18、 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:56:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-4:1990 BSI 12-19991 1 Scope This Part of BS 5734 specifies thermosetting polyester sheet moulding compounds which are classified according to their electrical and mechanical properties
19、 and which are further distinguished by their oxygen index. Compounds whose fibrous reinforcement includes materials other than E-glass are excluded. NOTE 1Appendix A lists further properties and appropriate test methods that may be specified by agreement between the purchaser and the supplier. NOTE
20、 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 definitions apply. 2.1 E-glass low alkali glass containing not more than 1 % of alkali metal oxides expressed as Na2O 2.2 batch a q
21、uantity of material so designated by the manufacturer and of uniform quality 2.3 flatwise perpendicular to the plane of the sheet, a direction in which a load or electric stress may be applied in testing a sheet 2.4 edgewise parallel to the plane of the sheet, a direction in which a load or electric
22、 stress may be applied in testing a sheet 3 Classification Requirements are specified for the following three types of sheet moulding compounds. The mechanical properties are the same as in BS 5734-5 and the suffix E indicates that they are electrical grades: S1E: an electrical type of material with
23、 superior mechanical properties; S2E: an electrical type of standard commercial material with good mechanical properties; S3E: an electrical type of general purpose material with lower mechanical properties. NOTECompounds may be further distinguished by their oxygen index if agreed between the purch
24、aser and the supplier (see Appendix A). 4 Composition The material shall consist of a chemically-thickened unsaturated polyester resin system, combined with fillers and E-glass fibre reinforcement, which is supplied in sheet form and is capable of being cured by moulding under heat and pressure. 5 P
25、reparation of test specimens The moulding conditions shall be as specified 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
26、 mould. 6 Conditioning of test specimens before testing Unless otherwise specified in the test method, moulded test specimens shall be conditioned 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 clau
27、ses 8 and 9. The moulded and conditioned material (see clauses 5 and 6) shall comply with Table 1, when tested by the methods given therein. NOTESee Appendix A for optional requirements that a purchaser may wish to specify. 8 Mass per unit area and mass distribution When tested by the method describ
28、ed 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 than 12 % from the nominal value for the average mass per unit area which shall
29、 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 by more than 10 % of the nominal value. 9 Glass content The described glass con
30、tent 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 %. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:56:17 GMT+00:0
31、0 2006, Uncontrolled Copy, (c) BSI BS 5734-4:1990 2 BSI 12-1999 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
32、within the stated storage life, the material shall be mouldable and 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);
33、 e) glass content; f) number and date of this British Standard, i.e. BS 5734-4:19901). Table 1 Properties 1) Marking BS 5734-4:1990 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 require
34、ments of the standard. The accuracy of the claim is 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. PropertyTest method Equivalent international test method UnitLim
35、it Type S1ES2ES3E Flexural strengthMethod 8 of BS 5734-1:1990 (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 Water absorptionBS 2782:Method 430B (mod
36、ified by Appendix B of this British Standard) Method 2 of ISO 62 mgmax.404040 Insulation resistanceBS 2782:Method 232 (see note 3) IEC 167M7min.106106106 Flatwise electric strength in oil at 90 C Clause 10.3 of BS 2782: Method 221A:1983 IEC 243MV/mmin.888 Edgewise electric strength in oil at 90 C Cl
37、ause 10.3 of BS 2782: Method 221G:1983 IEC 243kVmin.505050 Tracking resistanceBS 5901 (see note 4) IEC 112CTImin.500500500 NOTE 1Use “standard” test specimens and a rate of separation of the loading nose and supports of between 4 mm/min and 6 mm/min. Use 12 test specimens. NOTE 2Use 12 unnotched tes
38、t specimens, of length 120 2 mm, breadth 15 0.5 mm, thickness 4 0.2 mm. Test flatwise. NOTE 3Use a specimen of thickness 3 0.2 mm. NOTE 4If it has been established that a type formulation gives a satisfactory comparative tracking index (CTI), it is only necessary to carry out a proof test at 55 V fo
39、r quality control purposes. See Appendix C. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:56:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-4:1990 BSI 12-19993 Appendix A Test methods for additional properties that are subject to purchaser/supplier agreement Additional properties
40、and their associated test methods, which are subject to purchaser/supplier agreement, are given in Table 2. Appendix B Determination of water absorption Carry out the test as described in BS 2782:Method 430 B. Cut test specimens 50 1 mm 50 mm 3 0.2 mm from moulded sheet so that they have four cut ed
41、ges. Table 2 Test methods for additional properties that are subject to purchaser/supplier agreement PropertyTest methodUnitLimit Type S1ES2ES3E Temperature index at 20 000 h Method 5 of BS 5734-1:1990 min.Value to be stated by supplier Flexural strength at elevated temperature Appendix DMPamin.50 %
42、 of the appropriate values stipulated in Table 1 for flexural strength at 23 5 C Tracking resistanceMethod 7 of BS 5734-1:1990 CTImin.600600600 Deflection under load at 100 C Method 3 of BS 5734-1:1990 mmmax.1.51.51.0 Tensile strengthBS 2782:Method 320E (see note 1) MPamin.As agreed between purchase
43、r and supplier Moulding shrinkageBS 2782:Method 640A Use a panel size not less than 100 mm in width mm/mmax.As agreed between purchaser and supplier Oxygen indexMethod 4 of BS 5734-1:1990 (see note 2) min.As agreed between purchaser and supplier NOTE 1Use “standard” test specimens of thickness 4 0.2
44、 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 the sheet moulding compounds. Its use gives an indication of a suitable formulatio
45、n 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 conditions of use by products made from the she
46、et moulding compounds. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:56:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-4:1990 4 BSI 12-1999 Appendix C Determination of resistance to tracking: simplified proof test for quality control purposes C.1 Form of test specimens Use test sp
47、ecimens at least 15 mm long and at least 15 mm wide and of any convenient thickness not less than 3 mm. If the thickness of the test specimens needs to be reduced by machining to permit mounting of the test specimens in a standard testing fixture, leave one face intact and take care to protect it fr
48、om abrasion or other damage during the machining operation. C.2 Number of test specimens Test three test specimens. C.3 Conditioning Unless otherwise agreed between the purchaser and the supplier, test the material in the “as-received” condition. C.4 Procedure Perform the test as described in 6.3 of
49、 BS 5901:1980 at 23 5 C and at the specified voltage, on one original face of each of the three test specimens. The test specimen should withstand 50 drops of electrolyte without tracking. Appendix D Determination of flexural strength at elevated temperature NOTEThis test is optional and should be the subject of purchaser/supplier agreement (see Appendix A). Place the test specimen in an oven at the elevated temperature for 30 5 min and determine the flexural strength at this temperature using the procedure described