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1、BRITISH STANDARD BS 5734-3: 1990 Polyester moulding compounds for electrical and other purposes Part 3: Specification for dough moulding compounds for mechanical purposes Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-3:1990 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 88/40656 DC ISBN 0 580 18904 X 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 16:05:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-3:1990 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 Table 1 Properties2 Table 2
8、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 16:05:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-3:1990 ii BSI 12-1999 Foreword This Part of BS 5734 ha
9、s been prepared under the direction of the Plastics Standards Policy Committee and is a revision of BS 5734-3:1980, which is withdrawn. This Part of BS 5734 is the third in a series for polyester moulding compounds; the other Parts are as follows: Part 1: Methods of test; Part 2: Specification for d
10、ough moulding compounds for electrical purposes; Part 4: Specification for sheet moulding compounds for electrical purposes; Part 5: Specification for sheet moulding compounds for mechanical purposes. In this revision the test methods and the material performance have been updated. Three types of do
11、ugh moulding compounds for mechanical mouldings are specified in this Part and they may be further distinguished by their oxygen index. The three types specified are not intended to be used for electrical applications and it is therefore not specified that any glass fibre reinforcement be E-glass al
12、though the use of asbestos as a reinforcement is outside the scope of the standard. The requirements for low profile grades are under consideration and it is planned to issue a supplement in due course to cater for this type of material. Given in Appendix A is a list of additional properties that ma
13、y 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 intended for quality control purposes and should not be used for design data. Product certifica
14、tion. 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 the appropriate Part o
15、f 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 list of Association membe
16、rs. 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 pages This document compri
17、ses 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. Licensed Copy: sheffie
18、ldun sheffieldun, na, Mon Dec 04 16:05:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-3:1990 BSI 12-19991 1 Scope This Part of BS 5734 specifies thermosetting polyester dough moulding compounds which are classified according to their mechanical properties and if required can be further distin
19、guished by their oxygen index. Compounds using asbestos reinforcements 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 2The titles of the publications referred to in this standard are
20、 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 quantity of material so designated by the manufacturer and of unif
21、orm quality 3 Classification Requirements are specified for three types of dough moulding compounds according to their mechanical properties: M1: for mouldings with superior mechanical properties; M2: a general purpose material with good mechanical properties; M3: a general purpose material with low
22、er mechanical properties. NOTECompounds may be further distinguished by their oxygen index if agreed between the purchaser and the supplier (see Appendix A). 4 Composition The material shall consist of an unsaturated polyester resin system, combined with fillers and fibrous reinforcement other than
23、asbestos, to form a mix which 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 BS 2782:Method 902A. Test specimens for the determination of impact strength shall be either moulded to size or cut fro
24、m moulded sheet. They shall be notched by milling as specified in BS 2782:Method 359. In cases of dispute, the specimens shall be moulded to size. Test specimens for the determination of flexural strength shall be cut from moulded sheet. 6 Conditioning of test specimens before testing Unless otherwi
25、se 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 When tested by the appropriate methods, the moulded and conditioned material (see clauses 5 and 6) shall comply with Ta
26、ble 1. NOTESee Appendix A for optional requirements that a purchaser may wish to specify. 8 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 th
27、e container, at any time within the stated storage life, the material shall be mouldable and shall 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) numbe
28、r and date of this British Standard, i.e. BS 5734-3:19901). 1) Marking BS 5734-3:1990 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 cla
29、im 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. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
30、5734-3:1990 2 BSI 12-1999 Table 1 Properties PropertyTest method Equivalent international test method UnitLimit Type M1M2M3 Flexural strengthMethod 8 of BS 5734-1:1990 (see note 1) ISO 178MPamin.907050 Impact strengthMethod 11 of BS 5734-1:1990 (see note 2) ISO 179kJ/m2min.25155 NOTE 1Use “standard”
31、 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 1, notch type A. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
32、 5734-3:1990 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. Table 2 Test methods for additional propertie
33、s that are subject to purchaser/supplier agreement PropertyTest method Equivalent international test method UnitLimit Type M1M2M3 Flexural modulusMethod 10 of BS 5734-1:1990 (see note 1) ISO 178GPamin.876 Moulding shrinkageBS 2782:Method 640Amm/m max.As agreed between purchaser and supplier Oxygen i
34、ndexMethod 4 of BS 5734-1:1990 (see note 2) As agreed between purchaser and supplier 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. NOTE 2The test method described in method 4 of BS 5734-1:1990 of this standard is used
35、primarily for the purpose of monitoring consistency of production of dough 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 obta
36、ined 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 sheffieldun, na, Mon Dec 04 16:05:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 blank Licensed Copy:
37、sheffieldun sheffieldun, na, Mon Dec 04 16:05:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-3:1990 BSI 12-1999 Publications referred to BS 2782, Methods of testing plastics. BS 2782:Method 359, Determination of Charpy impact strength of rigid materials (Charpy impact flexural test). BS 2782:
38、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
39、-1, Methods of test. BS 5734-2, Specification for dough moulding compounds for electrical purposes2). BS 5734-4, Specification for sheet moulding compounds for electrical purposes2). BS 5734-5, Specification for sheet moulding compounds for mechanical purposes2). BS 5750, Quality Systems2). ISO 178,
40、 Plastics Determination of flexural properties of rigid plastics3). ISO 179, Plastics Determination of Charpy impact strength 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, L
41、inford Wood, Milton Keynes MK14 6LE. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5734-3: 1990 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing Br
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