इंटरनेट मानक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. “जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New” IS/IEC 60371-3-4 (1992): Specification for insulating materials based on MICA, Part 3 Specifications for individual materials, Section 4: Polyester film-backed mica paper with a B-stage epoxy resin binder [ETD 2: Solid Electrical Insulating Materials and Insulation Systems] “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda ““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee”” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS/IEC 60371-3-4 : 1992 Hkkjrh; ekud vHkzd vk/kkfjr m"ekjks/kh lkexzh dh fof'kf"V HHHHHkkkkkkkkkkxxxxx 33333 ,,,,,dddddyyyyy lllllkkkkkeeeeexxxxxzzzhhzzhhh dddddhhhhh fffffooooofffff'''''kkkkkfffff"""""VVVVV;;;;;kkkkk¡¡¡¡¡ vvvvvuuuuuqqqHHqqHHHkkkkkkkkkkxxxxx 44444 ccccchhhhh&&&&&LLLLLVVVVVsssttssttt ,,,,,WWWiiWWiiikkkkkDDDDDlllllhhhhh jjjjjsssffssffftttttuuuuu ccccckkkkkbbbbbaaaMMaaMMMjjjjj lllllfffffgggggrrrrr iiiiikkkkkWWWyyWWyyyhhhhhLLLLLVVVVVjjjjj fffffQQQQQYYYYYeeeee&&&&&iiiii```ff``fff"""""BBBBBrrrrr vvvvvHHHHHkkkkkzzzddzzddd iiiiisssiissiiijjjjj Indian Standard SPECIFICATION FOR INSULATING MATERIALS BASED ON MICA PART 3 SPECIFICATIONS FOR INDIVIDUAL MATERIALS Section 4 Polyester Film-Backed Mica Paper with a B-Stage Epoxy Resin Binder ICS 29.035.50 © BIS 2012 BU R E AU O F I N D I A N S TA N DA R D S MANAK BHAVAN, 9 B AHADUR SHAH ZAFAR MARG NEW DELHI 110002 March 2012 Price Group 5 Solid Electrical Insulating Materials and Insulating Systems Sectional Committee, ETD 02 NATIONAL FOREWORD This Indian Standard (Part 3/Sec 4) which is identical with IEC 60371-3-4 : 1992 ‘Specification for insulating materials based on mica — Part 3: Specifications for individual materials — Sheet 4: Polyester film-backed mica paper with a B-stage epoxy resin binder’ issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on the recommendation of the Solid Electrical Insulating Materials and Insulating Systems Sectional Committee and approval of the Electrotechnical Division Council. This standard is a part of series of standards based on IEC 60371 series. The committee has now decided to adopt the IEC Standard to harmonize it with the latest developments taken place at international level. This standard is now being published in single number based on IEC 60371 in various parts/sections. Other parts/sections in this series are: Part 1 Definitions and general requirements Part 2 Methods of test Part 3 Specifications for individual materials, Section 1 Commutator separators and materials Section 2 Mica paper Section 3 Specification for rigid mica materials for heating equipment Section 5 Glass-backed mica paper with an epoxy resin binder for post-impregnation (VPI) Section 6 Glass-backed mica paper with a B-stage epoxy resin binder Section 7 Polyester film mica paper with an epoxy resin binder for single conductor taping Section 8 Mica paper tapes for flame-resistant security cables Section 9 Moulding micanite The text of IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminology and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’. b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker. In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which are to be substituted in their respective places are listed below along with their degree of equivalence for the editions indicated: International Standard Corresponding Indian Standard Degree of Equivalence IEC 60243-1 : 19881) Methods of test IS 2584 : 1963 Method of test for Technically Equivalent for electrical strength of solid insulating electric strength of solid insulating materials — Part 1: Tests at power materials at power frequencies frequencies 1)Since revised in 1998. (Continued on third cover) IS/IEC 60371-3-4 : 1992 Indian Standard SPECIFICATION FOR INSULATING MATERIALS BASED ON MICA PART 3 SPECIFICATIONS FOR INDIVIDUAL MATERIALS Section 4 Polyester Film-Backed Mica Paper with a B-Stage Epoxy Resin Binder 1 Scope This International Standard gives requirements for electrical insulating materials made by combining mica paper with a single polyester film and impregnating the mica paper with an epoxy resin. The material is supplied in a flexible state with the resin in the B-stage for final cure after application. It may be supplied in the form of sheets or rolls. The specification covers material having nominal thickness from 0,16 mm to 0,23 mm. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and pa rties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 243-1: 1988, Methods of test for electric strength of solid insulating materials - Part 1: Tests at power frequencies. IEC 371-2: 1987, Specification for insulating materials based on mica - Part 2: Methods of test. IEC 371-3-2: 1991, Specification for insulating materials based on mica - Part 3: Specifications for individual materials - Sheet 2: Mica paper. IEC 674-3-2: 1992, Specification for plastic films for electrical purposes - Part 3: Specifications for individual materials - Sheet 2: Requirements for balanced biaxially oriented polyethylene terephthalate (PET) film used for electrical insulation. 3 Designation When ordering materials to this specification only the specification and type numbers need be quoted (see table 1). Example: IEC 371-3-4: type 4.1.01 1 371-3-4© IEC(cid:9) - 11 - IS/IEC 60371-3-4 : 1992 The type number is derived from: - the specification sheet number 4 plus the sheet table number 4.1 - plus the number of the product in the sheet table 4.1.01. The descriptive code quoted in table 1, for example F23/M150/R54 for type 4.1.01, is derived from: - film thickness (F) 23 gm, - muscovite mica content (M) 150 g/m2, resin content (R) 54 g/m2. NOTE - For phlogopite mica paper the letter "M" is replaced by the letter "P". Table 1 - Composition PET film Permissible thickness Volatile substance Mica content Resin content Mass/unit area range content Type Descriptive Code g/m2 g/m2 g/m2 g/m2 mm Max. Nom. Tol. Nom. Tol. Nom. Tol. Nom. Tol. Mean Individual ± ± ± ± 4.1.01 F23/M150/R54 32 3 150 12 54 8 236 23 0,15-0,17 0,14-0,18 1,0 4.1.02 F23/M150/R70 32 3 150 12 70 14 252 25 0,15-0,17 0,14-0,18 1,0 4.1.03 F23/M150/R100 32 3 150 12 100 20 282 28 0,16-0,18 0,15-0,19 1,0 4.1.04 F23/M160/R80 32 3 160 13 80 16 272 27 0,16-0,18 0,15-0,19 1,0 4.1.05 F23/P160/R80 32 3 160 13 80 16 272 27 0,16-0,18 0,15-0,19 1,0 4.1.06 F50/M160/R80 70 7 160 13 80 16 310 31 0,19-0,21 0,18-0,22 1,0 4.1.07 F50/P160/R80 70 7 160 13 80 16 310 31 0,19-0,21 0,18-0,22 1,0 4.1.08 F23/M180/R90 32 3 180 15 90 18 302 30 0,17-0,19 0,16-0,20 1,0 4.1.09 F23/P180/R90 32 3 180 15 90 18 302 30 0,17-0,19 0,16-0,20 1,0 4.1.10 F50/M180/R90 70 7 180 15 90 18 340 34 0,22-0,24 0,21-0,25 1,0 4.1.11 F50/P180/R90 70 7 180 15 90 18 340 34 0,22-0,24 0,21-0,25 1,0 4 Requirements: raw materials 4.1 Mica paper Mica paper referred to in this specification shall comply with the requirements of IEC 371-3-2. 4.2 Polyester film Plastics films used as backing material shall be PET and shall comply with the requirements of IEC 674-3-2. 4.3 Epoxy resin Any epoxy resin system may be used which enables the material to meet the requirements of this specification. 2 371-3-4 © I EC(cid:9) - 13 - IS/IEC 60371-3-4 : 1992 5 Requirements: compositions and tolerances When tested by the method of clause 6 of IEC 371-2 the composition of the products shall lie within the limits of table 1. 6 Requirement for material (as received) 6.1 General All materials in any one consignment shall have the same properties, within the limits of this specification, throughout the length of each roll. The surfaces shall be uniform and free from defects such as bubbles, pin-holes, creases and flaws. Material supplied in rolls shall be capable of being unrolled continuously without damage, and the force required to unroll the material shall be substantially uniform. Where interleaving is necessary or required by the purchaser, it shall not have any deleterious effect. To prevent damage to the mica paper component during winding, the unwinding tension shall be less than: 25 N/10 mm for 32 g/m2 film (23 µm film thickness), 45 N/10 mm for 70 g/m2 film (50 gm film thickness). Unless otherwise specified in the purchase contract the material shall be rolled with the mica surface on the outside. 6.2 Width This specification contains no requirement for width of tape. However, the following widths are preferred: 10, 12, 15, 20, 25, 30, 40 and 50 mm. The maximum trimmed width of full width material and sheet normally available is 1 000 mm. The tolerance on the width of the material shall be as in table 2. Table 2 - Tolerance on width Nominal width Tolerance mm mm <20 ± 0,5 >20 5500 ±1,0 >500 ± 5,0 3 371-3-4 ©IEC(cid:9) -15 - IS/IEC 60371-3-4 : 1992 6.3 Thickness Measure the thickness in accordance with clause 3 of IEC 371-2, using the apparatus given in 3.1.1 of that standard, making 10 measurements on one thickness of material. The measured values shall be in accordance with the requirements of table 1. 6.4 Length There is no requirement in this specification for roll length, and this should therefore be subject to the purchase contract. 6.5 Cores The tape shall be supplied compactly wound on cores of 25 mm, 40 mm, 55 mm, or 76 mm ID which shall be free from sharp edges. The width of the cores in relation to that of the tape should be subject to agreement between purchaser and supplier. Full width material and material wider than 100 mm shall be supplied on 55 mm or 76 mm cores. 6.6 Joins The number of rolls with joins shall be limited to 25 % of any one consignment. Joined rolls of length less than 100 m shall contain no more than one join. The number of joins in rolls of length of 100 m or greater should be subject to the purchase contract. The method of making joins should be subject to the purchase contract. 6.7 Stiffness The stiffness of the material should be subject to the purchase contract. When the stiff- ness is specified, the material should be tested by the method of clause 10 in IEC 371-2. 6.8 Resin flow When tested at 160 °C ± 2 °C by the method of clause 13 of IEC 371-2, resin flow shall be a minimum of 10 %. 7 Requirements for material after curing 7.1 General When required by the purchaser the supplier shall provide evidence that the material meets the requirements of clause 7. For the following tests the specimens shall be prepared in accordance with method 1 of clause 2 of IEC 371-2, the number of layers being chosen to give a final thickness as required for the measurement of properties after curing. Curing conditions should follow the recommendations of the supplier. 4 371-3-4 © I EC(cid:9) - 17 - IS/IEC 60371-3-4 : 1992 7.2 Flexural strength When tested by the method of clause 8 of IEC 371-2, the flexural strength shall be not less than 150 N/mm2 at (23 ± 2) °C nor less than 100 N/mm2 at (155 ± 5) °C. Visual evidence of delamination during the flexural strength test shall constitute failure. 7.3 Elastic modulus When tested by the method of clause 8 of IEC 371-2, the elastic modulus shall be not less than 30 kN/mm2. 7.4 Electric strength When tested by the method of clause 15 of IEC 371-2 with electrodes according to 4.1.1.1 (25/75 mm diameter) of IEC 243-1, the electric strength shall be not less than 50 kV/mm. 7.5 Dissipation factor/Temperature characteristics at 48-62 Hz When tested by the method of clause 16 of IEC 371-2, the dissipation factor shall not exceed the values stated in table 3 at the temperature given. Table 3 – Dissipation factor requirements Temperature Dissipation factor °C Max. 30 0,02 130 0,07 155 0,20 7.6 Thermal endurance This shall be tested in accordance with clause 20 of IEC 371-2 using flexural strength at (23 ± 2) °C as the property with reduction to 50 % of the original value as the end point criterion. This temperature index shall be not less than 155. 8 Packing The materials should be packaged to ensure adequate protection during transport, handling and storage. Any necessary packing requirements should be the subject of purchase contract. Each package containing a number of unit packs shall have the following information clearly and indelibly marked on it. a) description of the material and the number of this specification; 5