《BS-5734-2-1990.pdf》由会员分享，可在线阅读，更多相关《BS-5734-2-1990.pdf（10页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS 5734-2: 1990 Polyester moulding compounds for electrical and other purposes Part 2: Specification for dough moulding compounds for electrical purposes Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:56:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-2:1990 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 88/40655 DC ISBN 0 580 18903 1 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 14:56:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-2:1990 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 8Storage life1 9Marking1 Appendix A Test methods for additional properties that are subject to purchaser/supplier agreement3 Appendix B Determination of
8、resistance to tracking: simplified proof test for quality control purposes3 Appendix C Determination of flexural strength at elevated temperature3 Table 1 Properties2 Table 2 Test methods for additional properties that are subject to purchaser/supplier agreement3 Publications referred toInside back
9、cover Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:56:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-2:1990 ii BSI 12-1999 Foreword This Part of BS 5734 has been prepared under the direction of the Plastics Standards Policy Committee and is a revision of BS 5734-2:1980, which is
10、withdrawn. This Part of BS 5734 is the second in a series for polyester moulding compounds; the other Parts are as follows: Part 1: Methods of test; Part 3: Specification for dough moulding compounds for mechanical purposes; Part 4: Specification for sheet moulding compounds for electrical purposes;
11、 Part 5: Specification for sheet moulding compounds for mechanical purposes. Three types of dough moulding compound for electrical mouldings only are now specified in this Part since these more accurately reflect commercial usage than the five shown in the previous edition. They may be further disti
12、nguished by their oxygen index. 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. The properties specified in Table 1 and those recommended in Appendix A are i
13、ntended for quality control purposes and should not be used for design data. 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, whic
14、h may be coupled with assessment of a suppliers quality systems against 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 e
15、xist, users should consider approaching an appropriate body from the list 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 do
16、es not of itself confer immunity from legal obligations. Summary of pages 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. T
17、his will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:56:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-2:1990 BSI 12-19991 1 Scope This Part of BS 5734 specifies thermosetting polyester dough moulding compounds which
18、 are classified according to their electrical and mechanical properties and if required can be further distinguished by their oxygen index. Compounds whose fibrous reinforcement includes asbestos or glass other than E-glass are excluded. NOTE 1Appendix A lists further properties and appropriate test
19、 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 definitions apply. 2.1 E-glass low alkali g
20、lass 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 three types of dough moulding compounds according to their mechanical strength and are
21、resistance: E1: for mouldings with superior mechanical strength; E2: a general purpose material with good mechanical strength; E3: as E2 but with resistance to power arcing. 4 Composition The material shall consist of an unsaturated polyester resin system, combined with fillers and fibrous reinforce
22、ment other than asbestos, to form a mix which is capable of being cured by moulding under heat and pressure. If the reinforcement contains glass fibre it shall be made from E-glass. 5 Preparation of test specimens The moulding conditions shall be as given in Annex C of BS 2782:Method 902A. Test spec
23、imens for the determination of electric strength and water absorption shall be moulded to size. Test specimens for the determination of impact strength shall be either moulded to size or cut from moulded sheet. They shall be notched by milling as specified in BS 2782:Method 359. In cases of dispute,
24、 the specimens shall be moulded to size. Test specimens for the remainder of the tests specified in Table 1 shall be cut from moulded sheet. 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
25、 a temperature of 23 2 C and ambient relative humidity before testing. 7 Properties When tested by the appropriate methods, the moulded and conditioned material (see clauses 5 and 6) shall comply with Table 1. NOTESee Appendix A for optional requirements that a purchaser may wish to specify. 8 Stora
26、ge 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 and shal
27、l comply with clause 7. 9 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) number and date of this British Standard, i.e. BS 5734-2:19901). 1) Marking BS 5734-2:1990 on or in re
28、lation 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 responsibility of the person making the claim. Such a declaration is n
29、ot to be confused with third party certification of conformity, which may also be desirable. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:56:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-2:1990 2 BSI 12-1999 Table 1 Properties PropertyTest method Equivalent international test me
30、thod UnitLimit Type E1E2E3 Flexural strengthMethod 8 of BS 5734-1:1990 (see note 1) ISO 178MPamin.907070 Flexural modulusMethod 10 of BS 5734-1:1990 (see note 1) ISO 178GPamin.877 Impact strengthMethod 11 of BS 5734-1:1990 (see note 2) ISO 179kJ/m2min.251515 Insulation resistance BS 2782: Method 232
31、C (see note 3) IEC 167M 7min.105105105 Electric strength in oil at 90 C BS 2782: Method 221A IEC 243MV/m min.888 Tracking resistanceBS 5901 (see note 4) IEC 112CTImin.600600600 Power arc resistance Method 6 of BS 5734-1:1990 (see note 6) A pass in the test (see note 5) Water absorptionBS 2782: Metho
32、d 430A Procedure A of method 1 of ISO 62 mgmax.404040 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 test specimens, specimen type 3, notch type C. NOTE 3Use a test specimen of thicknes
33、s 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 the requisite voltage for quality control purposes. See Appendix B. NOTE 5To pass the test: a) complete 25 000 operations with
34、out either: 1) ignition of the test specimen, or 2) sustained arcing; b) and ensure that at the conclusion of the test, the insulation resistance measured as in 8.3 of BS 5734-1:1990 is not less than 1 M7. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:56:06 GMT+00:00 2006, Uncontrolled C
35、opy, (c) BSI BS 5734-2:1990 BSI 12-19993 Appendix A Test 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. Appendix B Determination of re
36、sistance to tracking: simplified proof test for quality control purposes B.1 Form of test specimens Use test specimens 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 specimen needs to be reduced by machining to permit moun
37、ting of the test specimens in a standard testing fixture, leave one face intact and take care to protect it from abrasion or other damage during the machining operation. B.2 Number of test specimens Test three test specimens. B.3 Conditioning Unless otherwise agreed between the purchaser and the sup
38、plier, test the material in the “as received” condition. B.4 Procedure Perform the test as described in 6.3 of BS 5901:1980 at 23 5 C, using test solution A and at the specified voltage, on one original face of each of the three test specimens. The test specimen should withstand 50 drops of electrol
39、yte without tracking. Appendix C 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 selected elevated temperature for 30 5 min and determine the fle
40、xural strength at this temperature using the procedure described in BS 2782:Method 335A. Use 12 test specimens each in the form of a rectangular bar of length not less than 80 mm, width 10 0.15 mm and thickness 4 0.2 mm. Use a rate of separation of the loading nose and supports of between 4 mm/min a
41、nd 6 mm/min. Table 2 Test methods for additional properties that are subject to purchaser/supplier agreement PropertyTest methodUnitLimit Type E1E2E3 Inclined plane tracking test Method 7 of BS 5734-1:1990 (see note 1) kVAs agreed between purchaser and supplier Deflection under load at 100 C Method
42、3 of BS 5734-1:1990 mmmax.2.52.51.5 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 CMPamin.Measure at a temperature to be specified by the purchaser Moulding shrinkageBS 2782:Method 640Amm/m max.As agreed
43、 between purchaser and supplier using a panel size of not less than 10 mm in width Oxygen indexMethod 4 of BS 5734-1:1990 (see note 2) min.As agreed between purchaser and supplier NOTE 1This test is designed to distinguish materials within types E1, E2 and E3 whose tracking resistance is above the r
44、ange covered by BS 5901. 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 dough moulding compounds. Its use gives an indication of a suitable formulation which influences the performance of a moulded test s
45、pecimen 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 dough moulding compounds. Licensed Copy: sheffieldun shef
46、fieldun, na, Fri Dec 01 14:56:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 blank Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:56:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-2:1990 BSI 12-1999 Publications referred to BS 2782, Methods of testing plastics. BS 2782:Method 141,
47、 Determination of flammability by oxygen index. BS 2782:Methods 220 and 221, Determination of electric strength: rapidly applied voltage method. Determination of electrical strength: step-by-step method. BS 2782:Method 232, Determination of insulation resistance. BS 2782:Method 335A, Determination o
48、f flexural properties of rigid plastics. BS 2782:Methods 430A to 430D, Determination of water absorption at 23 C. Determination of water absorption at 23 C with allowance for water-soluble matter. Determination of boiling water absorption. Determination of boiling water absorption with allowance for
49、 water-soluble matter. BS 2782:Method 640A, Determination of shrinkage of test specimens in the form of bars of compression moulded thermosetting 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 5734-3, Specification for dough moulding compounds for mechanical purposes2). BS 5734-4, Specification for sheet moulding compounds for electrical purposes2). BS 5734-5, Specification