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1、BRITISH STANDARD BS 1858:1973 Incorporating Amendment No. 1 Specification for Bitumen-based filling compounds for electrical purposes UDC 621.315.61:678.584 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:22:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1858:1973 This British Standard,
2、having been approved by the Electrical Industry Standards Committee, was published under the authority of the Executive Board on 3 October 1973 BSI 10-1999 BS 688 first published December 1936 BS 803 first published May 1938 First revision combining both standards June 1952 Second revision April 195
3、7 Third revision October 1973 The following BSI references relate to the work on this standard: Committee reference ELE/16/53 and ELE/16/53/9 Draft for comment 68/30345 ISBN 0 580 07831 0 Co-operating organizations The Electrical Industry Standards Committee, under whose supervision this British Sta
4、ndard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represen
5、ted on the committee entrusted with the preparation of this British Standard: Associated Offices Technical CommitteeElectrical Contractors Association Association of Consulting EngineersElectrical Contractors Association of Scotland Association of Manufacturers of DomesticElectrical Research Associa
6、tion* Electrical AppliancesElectricity Council, the Central Electricity Association of Mining Electrical andGenerating Board and the Area Boards in Mechanical EngineersEngland and Wales* Association of Public Passenger TransportElectronic Engineering Association* OperatorsEngineering Equipment Users
7、 Association Association of Supervisory and ExecutiveInstitution of Electrical and Electronics EngineersTechnician Engineers British Electrical and Allied ManufacturersInstitution of Electrical Engineers Association*Lighting Industry Federation Limited British Radio Equipment ManufacturersMinistry o
8、f Defence AssociationMinistry of Defence, Army Department* British Railways BoardMinistry of Defence, Navy Department* British Steel CorporationNational Inspection Council for Electrical Crown Agents for Oversea Governments andInstallation Contracting AdministrationsNational Physical Laboratory (Dep
9、artment of Department of EmploymentTrade and Industry)* Department of the EnvironmentOil Companies Materials Association Department of Trade and Industry*Post Office* Electric Cable Makers Confederation*South of Scotland Electricity Board Adhesive Tape Manufacturers AssociationInstitute of Petroleum
10、 British Calibration ServiceMinistry of Defence, Procurement Executive British Electro-Ceramic ManufacturersRadio and Electronic Components AssociationManufacturers Federation British Plastics FederationRefined Bitumen Association British Tar Industries AssociationTelecommunication Engineering and G
11、lass Textile AssociationManufacturing Association Amendments issued since publication Amd. No.Date of issueComments 5457April 1987Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:22:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1858:1973 BSI 10-1999i
12、 Contents Page Co-operating organizationsInside front cover Forewordii 1Scope1 2Classification1 3General requirements1 4Solubility1 5Softening point1 6Penetration1 7Viscosity of Class I compound2 8Pouring point of compounds of Classes II to VI2 9Electric strength (proof) test2 10Flash point (open)2
13、11Mineral matter (ash)2 12Acidity: neutralization value2 13Freedom from injurious sulphur3 14Adhesive properties3 15Contraction and depth of pipe3 16Segregation test for Class VI compound3 Appendix A Solubility of Class VI compound4 Appendix B Pouring point of compounds of Classes II to VI4 Appendix
14、 C Electric strength (proof) test5 Appendix D Mineral matter (carbonated ash) for Class VI compound6 Appendix E Injurious sulphur6 Appendix F Adhesive properties7 Appendix G Contraction and depth of pipe7 Appendix H Segregation test for Class VI compound7 Figure 1 Folded filter paper8 Figure 2 Appar
15、atus for determination of pouring point arranged for electrical heating8 Figure 3 Valve, holder and stirrer9 Figure 4 Container for compound and jet10 Figure 5 Outer vessel for electrical heating11 Figure 6 Outer vessel for gas heating12 Figure 7 Apparatus for electric strength (proof) test12 Figure
16、 8 Apparatus for determination of adhesive properties13 Figure 9 Glass tube for contraction and depth of pipe14 Table 1 Classification1 Table 2 Tolerance on softening point1 Table 3 Penetration at 25 C2 Table 4 Tolerance on penetration2 Table 5 Electric strength (proof) test requirements2 Table 6 Mi
17、neral matter2 Table 7 Contraction3 Table 8 Mould temperatures7 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:22:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1858:1973 ii BSI 10-1999 Foreword In this revision of BS 1858, the methods of test co
18、ntinue to be based as far as possible on the “Standard methods for testing petroleum and its products”, published by the Institute of Petroleum1). A number of these methods are published as British Standards, which are revised with the minimum of delay when the Institutes methods are revised. In ord
19、er that this British Standard does not diverge from any revised methods of test, the relevant British Standard is quoted where applicable. The technical requirements are substantially the same as those of the previous edition, but some changes have been made to cater for up-to-date techniques. The r
20、equirements for the mineral matter (ash) of Class VI compounds have been amended and the method of test has been altered to give a more quantitative equivalence of the filler used. This British Standard calls for the use of substances that may be injurious to health if adequate precautions are not t
21、aken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage. Certain tests call for the use of asbestos in the construction of apparatus. Due regard should be given to current legislation governing the use of asbestos
22、and alternative materials should be used if possible. 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
23、obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 14, 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 tabl
24、e on the inside front cover. 1) 61 New Cavendish Street. London W1. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:22:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1858:1973 BSI 10-19991 1 Scope This British Standard specifies requirements for bitumen-based compounds, suitable for use
25、as filling compounds, which are subjected to electrical stress in service. Oils and oil-resisting compounds, cold pouring compounds and those designed for special purposes are not covered by this standard. NOTE 1Compliance of a filling compound with the provisions of this standard does not necessari
26、ly indicate that it is suitable for a particular purpose intended by the purchaser. When there is any doubt as to the type of compound to be used for any electrical purpose, the supplier of the compound should be consulted. NOTE 2The titles of the British Standards referred to in this standard are l
27、isted on the inside back cover. 2 Classification The classes of compounds covered by this British Standard are listed in Table 1. Table 1 Classification 3 General requirements The compound shall be stable and shall neither froth nor emit excessive fumes when heated to a temperature 85 C above the so
28、ftening point (see Clause 5). Under normal conditions of use there shall be no formation of gas pockets, cavities or cracks in the compound on cooling. At the temperature reached during installation and under the conditions of service, the compound shall have no injurious effect on copper, brass, ir
29、on, lead or aluminium. This stipulation applies also to fibrous materials provided that they themselves will withstand such temperatures. The compound shall be capable of being remelted repeatedly, without significant separation of the constituents, provided that a temperature of 20 C above the pour
30、ing temperature is not exceeded and that local overheating is avoided. Compounds, especially those of high softening point, shall not be maintained at these temperatures for longer than is necessary. NOTEReferences to removal of water in various test methods are applicable only when samples of compo
31、und have been contaminated. 4 Solubility The solubility of compounds of Classes I, II, III, IV and V shall be determined by the method given in BS 2000-47 and that of Class VI compound by the method described in Appendix A. The insoluble content, including the proportion of mineral matter permitted
32、by Clause 11, shall not exceed the appropriate value given below. 5 Softening point The softening point shall be determined by the “ring and ball” method described in BS 2000-58.2) The softening point of Class I compound shall not exceed 40 C and the softening points of all classes shall not vary fr
33、om the agreed values by more than the amounts given in Table 2. Table 2 Tolerance on softening point 6 Penetration The penetration value of compounds of Classes II, III, IV, V and VI shall be not less3) than the appropriate value given in Table 3, and the tolerance on penetration shall be in accorda
34、nce with that given in Table 4. The test for penetration of the compound shall be carried out as described in BS 2000-49. DescriptionClass Limits of softening pointa Min.Max. Bitumen-based compound I II III IV V Over Over Over Over 40 C 70 C 90 C 120 C 40 C 70 C 90 C 120 C Natural asphalt-based or b
35、itumen-based compounds, or both, containing mineral matter VI b a See Clause 5. b There is no specified requirement. Any requirement should be the subject of a purchase contract. Class of compoundInsoluble content I, II, III, IV, V0.5 % VI60 % 2) There is no specified requirement. Any requirement sh
36、ould be the subject of a purchase contract. Class of compoundTolerance C I II III IV V VI 5a 3 3 5 5 3 a Except when too fluid to test for softening point. 3) Absolute values are not specified in this standard and should be the subject of a purchase contract. Licensed Copy: sheffieldun sheffieldun,
37、na, Fri Nov 24 06:22:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1858:1973 2 BSI 10-1999 Table 3 Penetration at 25 C Table 4 Tolerance on penetration 7 Viscosity of Class I compound The viscosity of Class I compound shall be determined in accordance with BS 2000-72 and shall not vary from a spe
38、cified value4) by more than 25 % of that value. 8 Pouring point of compounds of Classes II to VI The pouring point of compounds of Classes II, III, IV, V and VI shall be determined in accordance with the method of Appendix B4). The tolerance on pouring point shall be 5 C. NOTEThe pouring point may b
39、e regarded as approximating to the temperature to which the compound should be heated for pouring in actual practice and should not be exceeded by more than 20 C. When the pouring point is not known, the pouring temperature may be taken as being approximately 85 C above the softening point of the co
40、mpound (see Clause 5) for Classes I, II, III, IV and V bitumen-based compounds, though this empirical rule may not hold for certain Class VI compounds. 9 Electric strength (proof) test Two samples of the compound shall be tested as described in Appendix C. If one sample fails to withstand for one mi
41、nute without puncture the appropriate voltage given in Table 5, at the stated temperature, a third sample shall be tested. The compound shall meet the requirements of this Clause if the results of two out of three tests are satisfactory. Table 5 Electric strength (proof) test requirements 10 Flash p
42、oint (open) The flash point of a compound of any class, when determined by one of the methods described in BS 2000-35 or BS 4689, shall be not less than 200 C. In cases of dispute, the method given in BS 2000-35 shall be employed. 11 Mineral matter (ash) The amount of mineral matter in a compound of
43、 Classes I, II, III, IV and V shall be determined by the method of ashing described in BS 4450. The mineral matter in a compound of Class VI shall be determined by the method given in Appendix D. The amount of mineral matter shall not exceed the appropriate value given in Table 6. Table 6 Mineral ma
44、tter 12 Acidity: neutralization value If the neutralization value for any class of compound is required to be specified then this shall not exceed 10 mg KOH/g and shall be determined in accordance with the indicator method described in BS 2000-213. NOTEIn the absence of any requirement to the contra
45、ry in the purchase contract, it is preferable that the neutralization value should not exceed 4 mg KOH/g. Class of compound Penetration (minimum) II III IV V VI 20 20 10 7 7 Penetration valueTolerance Up to 10 11 to 80 81 and above 2 4 10 4) The value of the property is not specified in this standar
46、d. This should be the subject of a purchase contract. Class of compound Test temperatureTest voltage (r.m.s) CkV I II III 60 1 60 1 60 1 15 20 20 IV V VI 90 1 90 1 60 1 20 20 15 with softening point above 70 C VI60 112 with softening point below 70 C Class of compoundMineral matter I, II, III, IV, V
47、Not more than 0.5 % VIAs agreed between the purchaser and the supplier, but not exceeding 60 % Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:22:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1858:1973 BSI 10-19993 13 Freedom from injurious sulphur The compound shall be tested as descri
48、bed in Appendix E, and there shall be no more than a slight discoloration of the copper. 14 Adhesive properties If specified by the purchaser, the compound, other than a compound of Class I, shall be tested for adhesive properties. The method of test shall be that described in Appendix F. The compou
49、nd shall be considered to have satisfied the requirements of the test if adhesion occurs over an area of the plate not less than 90 % of that which had been exposed to the molten compound. 15 Contraction and depth of pipe 15.1 Contraction. The compound shall be tested for contraction as described in Appendix G. The contraction shall not exceed the appropriate value given in Table 7. Table 7 Contraction 15.2 Depth of pipe. The compound shall