BS-EN-61249-7-1-1996 IEC-61249-7-1-1995.pdf

BRITISH STANDARD BS EN 61249-7-1:1996 IEC 1249-7-1: 1995 Materials for interconnection structures Part 7: Sectional specification set for restraining core materials Section 1: Copper/invar/copper The European Standard EN 61249-7-1:1995 has the status of a British Standard ICS 31.180 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 16:31:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61249-7-1:1996 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 August 1996 © BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference EPL/52 Draft announced in BSI News Update May 1996 ISBN 0 580 26031 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee EPL/52, Printed circuits, on which the following bodies were represented: British Telecommunications plc Electrical and Electronic Industries Association (BEAMA Ltd.) Federation of the Electronics Industries GAMBICA (BEAMA Ltd.) Institute of Metal Finishing National Supervisory Inspectorate Printed Circuit Interconnection Federation Surface Mount CIC type B Copper/Invar/copper in the ratio 12,5/75/12,5 by volume percentage; CIC type C Copper/Invar/copper in the ratio 20/60/20 by volume percentage. The tolerance shall be ± 10 % of the nominal content of each component. 3.2 Constituent materials 3.2.1 Invar Nickel-iron alloy of the following composition: 3.2.2 Copper The copper shall have a minimum purity of 99,8 % copper (with silver content regarded as copper), excluding any “as shipped” surface treatment. Element% by weight Nickel35,5 36,5 Phosphorus0,025 maximum Sulphur0,025 maximum Carbon0,12 maximum Manganese0,50 maximum Silicon0,25 maximum Ironbalance Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 16:31:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61249-7-1:1995 4 © BSI 11-1999 4 Electrical properties Table 1 Electrical properties 5 Non-electrical properties 5.1 Appearance The copper-clad faces shall be free from oxide, blisters, wrinkles, pin-holes, deep scratches, and pits. 5.2 Thickness The thickness of the CIC material, measured by a micrometer, shall not depart from the nominal thickness by more than the appropriate value shown below. Table 2 Thickness tolerances 5.3 Bow and twist Table 3 Bow and twist 5.4 Tensile strength and elongation Table 4 Tensile and elongation properties PropertyTest methodCIC typeRequirement M7m ResistivityAs specified in IEC 468 A0,17 ± 0,01 B0,07 ± 0,01 C0,04 ± 0,01 Nominal thickness mm Tolerance ± mm 0,10 to 0,300,010 Over 0,30 to 0,600,025 Over 0,60 to 1,200,050 Over 1,20 to 2,400,10 Property Test method (sub-clause of IEC 249-1) Requirement For all CIC types % Bow3.10,5 max. Twist3.30,5 max. PropertyTest methodCIC typeRequirement Tensile strengthAs specified in ISO 6892A380 N/mm2 to 480 N/mm2 B380 N/mm2 to 480 N/mm2 C310 N/mm2 to 480 N/mm2 Elongation (gauge length: 50 mm) As specified in ISO 6892A25 % min. B20 % min. C20 % min. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 16:31:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61249-7-1:1995 © BSI 11-19995 5.5 Modulus of elasticity Table 5 Modulus of elasticity 5.6 Thermal coefficient of expansion Table 6 Thermal coefficient of expansion 5.7 Bond strength between copper and Invar The CIC material shall be capable of being bent 180° around an arbor with a diameter equal to the thickness of the material without showing separation between the layers, at room temperature. 6 Surface treatment The sheet shall be capable of being bonded to a laminate according to the suppliers recommendations. If agreed upon between purchaser and supplier, the copper surface may be given a chemical or electrochemical treatment to enhance adhesion to the required substrate. If such a treatment has been applied, it shall be substantially uniform in colour and intensity over the entire area of the surface so treated, and shall be sufficiently adherent to withstand normal handling of the material during the users manufacturing processes, including the lamination process itself, and to meet the relevant requirements of the laminate manufactured from the CIC material. 7 Packaging and marking The material shall be packed adequately to avoid damage, bow, contamination in transit and storage. Separate sheets shall be interleaved with chemically neutral, or suitably treated paper. Each package shall be labelled with the material type designation, the manufacturers name, the nominal material thickness and the batch reference number. The package label shall also show the number of sheets. Any labels on sheets shall remain securely fixed during normal handling but shall be capable of easy removal prior to fabrication. By agreement between purchaser and supplier, the order number may be substituted for material type designation and batch reference number, and total weight may be substituted for number of sheets. PropertyTest methodCIC type Requirement N/mm2 Modulus of elasticity As specified in ISO 178A147 × 103 min. B140 × 103 min. C135 × 103 min. Property Test method (sub-clause of IEC 249-1) CIC type Requirement 106 K1 Machine direction Transversal direction Thermal coefficient of expansion (over the range 5 °C to 125 °C) 4.5A3,0 to 5,03,6 to 5,7 B3,6 to 5,73,6 to 5,7 C4,2 to 6,23,6 to 5,7 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 16:31:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61249-7-1:1995 6 © BSI 11-1999 Annex ZA (normative) Normative references to international publications with their corresponding European publications This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). NOTE. When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. PublicationYearTitleEN/HDYear IEC 249-11982Base materials for printed circuitsEN 60249-1a1993 Part 1: Test methods IEC 4681974Method of measurement of resistivity of metallic materials ISO 68921984Metallic materials Tensile testing ISO 1781993Plastics Determination of flexural properties a EN 60249-1 includes A1:1984 + A2:1989 + A3:1991 to IEC 249-1. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 16:31:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61249-7-1:1996 © BSI 11-1999 List of references See national foreword. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 16:31:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61249-7-1:1996 IEC 1249-7-1: 1995 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. 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