BS EN 61249-2-35:2009 BSI British Standards Materials for printed boards and other interconnecting structures — Part 2-35: Reinforced base materials, clad and unclad — Modified epoxide woven E-glass laminate sheets of defined flammability (vertical burning test), copper-clad for lead-free assembly NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW raising standards worldwide™ BRITISH STANDARD BS EN 61249-2-35:2009 National foreword This British Standard is the UK implementation of EN 61249-2-35:2009 It is identical to IEC 61249-2-35:2008 The UK participation in its preparation was entrusted to Technical Committee EPL/501, Electronic assembly technology A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © BSI 2009 ISBN 978 580 57383 ICS 31.180 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2009 Amendments issued since publication Amd No Date Text affected BS EN 61249-2-35:2009 EUROPEAN STANDARD EN 61249-2-35 NORME EUROPÉENNE March 2009 EUROPÄISCHE NORM ICS 31.180 English version Materials for printed boards and other interconnecting structures Part 2-35: Reinforced base materials, clad and unclad Modified epoxide woven E-glass laminate sheets of defined flammability (vertical burning test), copper-clad for lead-free assembly (IEC 61249-2-35:2008) Matériaux pour circuits imprimés et autres structures d'interconnexion Partie 2-35: Matériaux de base renforcés, plaqués et non plaqués Feuilles stratifiées en tissu de verre de type E époxyde modifié, plaquées cuivre, d'inflammabilité définie (essai de combustion verticale) pour les assemblages sans plomb (CEI 61249-2-35:2008) Materialien für Leiterplatten und andere Verbindungsstrukturen Teil 2-35: Kaschierte und unkaschierte verstärkte Basismaterialien Kupferkaschierte mit E-Glasgewebe verstärkte Laminattafeln auf der Basis von modifiziertem Epoxidharz mit definierter Brennbarkeit (Brennprüfung mit vertikaler Prüflingslage) für bleifreie Bestückungstechnik (IEC 61249-2-35:2008) This European Standard was approved by CENELEC on 2009-02-01 CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: avenue Marnix 17, B - 1000 Brussels © 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members Ref No EN 61249-2-35:2009 E BS EN 61249-2-35:2009 EN 61249-2-35:2009 –2– Foreword The text of document 91/810/FDIS, future edition of IEC 61249-2-35, prepared by IEC TC 91, Electronics assembly technology, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61249-2-35 on 2009-02-01 The following dates were fixed: – latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2009-11-01 – latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2012-02-01 Annex ZA has been added by CENELEC Endorsement notice The text of the International Standard IEC 61249-2-35:2008 was approved by CENELEC as a European Standard without any modification In the official version, for Bibliography, the following note has to be added for the standard indicated: IEC 60194 NOTE Harmonized as EN 60194:2006 (not modified) BS EN 61249-2-35:2009 –3– EN 61249-2-35:2009 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documents are indispensable for the application of this document For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies Publication Year Title IEC 61189-2 2006 Test methods for electrical materials, printed EN 61189-2 boards and other interconnection structures and assemblies Part 2: Test methods for materials for interconnection structures 2006 IEC 61249-5-1 1995 Materials for interconnection structures EN 61249-5-1 Part 5: Sectional specification set for conductive foils and films with and without coatings Section 1: Copper foils (for the manufacture of copper-clad base materials) 1996 ISO 9000 - 1) Quality management systems Fundamentals and vocabulary EN ISO 9000 2005 ISO 11014-1 - 1) Safety data sheet for chemical products Part 1: Content and order of sections - - ISO 14001 - 1) Environmental management systems Requirements with guidance for use EN ISO 14001 2004 1) 2) Undated reference Valid edition at date of issue EN/HD Year 2) ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 2) BS EN 61249-2-35:2009 –2– 61249-2-35 © IEC:2008 CONTENTS Scope .6 Normative references Materials and construction 3.1 Resin system 3.2 Metal foil 3.3 Reinforcement Internal marking Electrical properties Non-electrical properties of the copper-clad laminate 6.1 Appearance of the copper-clad sheet .7 6.1.1 Indentations (pits and dents) 6.1.2 Wrinkles 6.1.3 Scratches 6.1.4 Raised areas .8 6.1.5 Surface waviness .9 6.2 Appearance of the unclad face .9 6.3 Laminate thickness 6.4 Bow and twist 6.5 Properties related to the copper foil bond 10 6.6 Punching and machining 11 6.7 Dimensional stability 11 6.8 Sheet sizes 11 6.8.1 Typical sheet sizes 11 6.8.2 Tolerances for sheet sizes 12 6.9 Cut panels 12 6.9.1 Cut panel sizes 12 6.9.2 Size tolerances for cut panels 12 6.9.3 Rectangularity of cut panels 12 Non-electrical properties of the base material after complete removal of the copper foil 12 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 7.1 Appearance of the dielectric base material 12 7.2 Flexural strength 13 7.3 Flammability 13 7.4 Water absorption 14 7.5 Measling 14 7.6 Glass transition temperature and cure factor 15 7.7 Decomposition temperature 15 7.8 Thermal resistance 15 7.9 Z-axis expansion 15 Quality assurance 16 8.1 8.2 8.3 8.4 8.5 Quality system 16 Responsibility for inspection 16 Qualification inspection 16 Quality conformance inspection 16 Certificate of conformance 16 BS EN 61249-2-35:2009 61249-2-35 © IEC:2008 –3– 8.6 Safety data sheet 17 Packaging and marking 17 10 Ordering information 17 Annex A (informative) Engineering information 18 Annex B (informative) Common laminate constructions 20 Annex C (informative) Guideline for qualification and conformance inspection 22 Bibliography 23 Table – Electrical properties Table – Nominal thickness and tolerance of metal-clad laminate Table – Bow and twist 10 Table – Pull-off and peel strength 10 Table – Dimensional stability 11 Table – Size tolerances for cut panels 12 Table – Rectangularity of cut panels 12 Table – Flexural strength 13 Table – Flammability 14 Table 10 – Water absorption 14 Table 11 – Measling 15 Table 12 – Glass transition temperature and cure factor 15 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Table 13 – Decomposition temperature 15 Table 14 – Thermal resistance 15 Table 15 – Z-axis expansion 16 BS EN 61249-2-35:2009 –6– 61249-2-35 © IEC:2008 MATERIALS FOR PRINTED BOARDS AND OTHER INTERCONNECTING STRUCTURES – Part 2-35: Reinforced base materials, clad and unclad – Modified epoxide woven E-glass laminate sheets of defined flammability (vertical burning test), copper-clad for lead-free assembly Scope This part of IEC 61249 gives requirements for properties of modified brominated epoxide woven E-glass laminate sheet 0,05 mm up to 3,2 mm, of defined flammability (vertical burning test), copper-clad The glass transition temperature is defined to be 150 °C to 200 °C Its flame resistance is defined in terms of the flammability requirements of 7.3 Some property requirements may have several classes of performance The class desired should be specified on the purchase order; otherwise, the default class of material will be supplied Normative references ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ The following referenced documents are indispensable for the application of this document For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies IEC 61189-2:2006, Test methods for electrical materials, printed boards and other interconnection structures and assemblies – Part 2: Test method for interconnection structures IEC 61249-5-1:1995, Materials for interconnection structures – Part 5: Sectional specification set for conductive foils and films with and without coatings – Section 1: Copper foils (for the manufacture of copper-clad base materials) ISO 9000, Quality management systems – Fundamentals and vocabulary ISO 11014-1, Safety data sheet for chemical products – Part 1: Content and order of sections ISO 14001, Environmental management systems – Requirements with guidance for use Materials and construction The sheet consists of an insulating base with metal-foil bonded to one side or both 3.1 Resin system Majority di-functional epoxide, modified epoxide, woven E-glass laminate with a glass transition temperature of 150 °C to 200 °C The flammability rating is achieved through the use of bromine reacted into the polymer Inorganic fillers may be used Contrast agents may be added to enhance processing such as automated optical inspection (AOI) Its flame resistance is defined in terms of the flammability requirements of 7.3 BS EN 61249-2-35:2009 61249-2-35 © IEC:2008 3.2 –7– Metal foil Copper as specified in IEC 61249-5-1, copper foil (for the manufacture of copper-clad materials) The preferred foils are electro-deposited of defined ductility 3.3 Reinforcement Woven E-glass as specified in the future IEC 61249-6-3, woven E-glass fabric (for the manufacture of prepreg and copper clad materials) Internal marking Not specified Electrical properties The electrical property requirements are shown in Table Table – Electrical properties Property Test method (IEC 61189-2) Requirements 2E12 As specified in IEC 61249-5-1 Resistance of foil Surface resistance after damp heat while in the humidity chamber (optional) ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 2E03 ≥10 000 MΩ 2E03 ≥50 000 MΩ Volume resistivity after damp heat while in the humidity chamber (optional) 2E04 ≥5 000 MΩm Volume resistivity after damp heat and recovery 2E04 ≥10 000 MΩm Relative permittivity after damp heat and recovery (1 MHz) 2E10 ≤5,4 Dissipation factor after damp heat and recovery (1 MHz) 2E10 ≤0,035 Electric strength (only for material thickness less than 0,5 mm) 2E11 ≥30 kV/mm Arc resistance 2E14 ≥60 s Dielectric breakdown (only for material thicknesses ≥0,5 mm) 2E15 ≥40 kV Surface resistance at 125 °C 2E07 ≥1 000 MΩ Volume resistivity at 125 °C 2E07 ≥1 000 MΩm Surface resistance after damp heat and recovery 6.1 Non-electrical properties of the copper-clad laminate Appearance of the copper-clad sheet The copper-clad face shall be substantially free from defects that may have an impact on the material´s fitness for use for the intended purpose For the following specific defects, the requirements given shall apply when inspection is made in accordance with IEC 61189-2, method 2M18 BS EN 61249-2-35:2009 61249-2-35 © IEC:2008 –8– 6.1.1 Indentations (pits and dents) The size of an indentation, usually the length, shall be determined and given a point value to be used as measure of the quality Size mm Point value for each indentation 0,13 – 0,25 0,26 – 0,50 0,51 – 0,75 0,76 – 1,00 Over 1,00 30 The total point count for any 300 mm × 300 mm area shall be calculated to determine the class of the material Class A 29 maximum Class B 17 maximum Class C maximum Class D Class X To be agreed upon by user and supplier The required class of material shall be specified in the purchase order Class A applies unless otherwise specified 6.1.2 Wrinkles ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ There shall be no wrinkles in the copper surface 6.1.3 Scratches Scratches deeper than 20 % of the nominal thickness of the foil thickness are not permitted Scratches with a depth less than % of the nominal thickness of the foil shall not be counted unless this depth is 10 μm or more Scratches with a depth between % and 20 % of the nominal thickness of the foil are permitted to a total length of 100 mm for a 300 mm × 300 mm area 6.1.4 Raised areas Raised areas are usually impressions in the press plates used during manufacture but may also be caused by blisters or inclusions of foreign particles under the foil Raised areas caused by blisters or inclusions are not permitted Raised areas being impressions of defects in press plates are permitted to the following extent: Class A and X material maximum height 15 μm and maximum length 15 mm; Class B and C material maximum height μm and maximum length 15 mm; Class D material maximum height μm and maximum length 15 mm BS EN 61249-2-35:2009 61249-2-35 © IEC:2008 – 12 – 6.8.2 Tolerances for sheet sizes The size of sheet delivered by the supplier shall not deviate more than +20 mm from the ordered size 6.9 Cut panels 6.9.1 Cut panel sizes Cut panel sizes, when delivered, shall be in accordance with the purchaser’s specification 6.9.2 Size tolerances for cut panels For panels cut to size according to the purchaser’s specification, the following tolerances for length and width shall apply as shown in Table Tolerances indicated as normal shall be in effect unless otherwise specified by in the purchasing specification Table – Size tolerances for cut panels Tolerance ± mm Panel size mm Normal Close ≤300 2,0 0,5 >300 ≤ 600 2,0 0,8 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 2,0 >600 NOTE 6.9.3 1,6 The specified tolerances include all deviations caused by cutting the panels Rectangularity of cut panels For panels cut to size according to the purchaser’s specification, the following requirements for rectangularity shall apply as shown in Table Tolerance indicated as normal shall be in effect unless otherwise specified in the purchasing specification Table – Rectangularity of cut panels Property Rectangularity of cut panels 7.1 Test method (IEC 61189-2) 2M23 Requirement mm/m Normal Close ≤3 ≤2 Non-electrical properties of the base material after complete removal of the copper foil Appearance of the dielectric base material The etched specimens shall be inspected to verify that no surface or subsurface imperfections of the dielectric material exceed those shown below The panels shall be inspected using an optical aid apparatus which provides a minimum magnification of 4X Referee inspection shall be conducted at 10X magnification Lighting conditions of inspection shall be appropriate to the material under inspection or as agreed upon between user and supplier BS EN 61249-2-35:2009 61249-2-35 © IEC:2008 – 13 – Surface and subsurface imperfections (such as weave texture, resin starvation, voids, foreign inclusions) shall be acceptable provided that the imperfections meet the following: • the reinforcement fibres are not cut or exposed; • the foreign inclusions are not conductive; • the imperfections not propagate as a result of thermal stress; • the foreign inclusions are translucent; • opaque foreign fibres are less than 15 mm in length and average no more than one per 300 mm × 300 mm area; • opaque foreign inclusions other than fibres shall not exceed 0,50 mm Opaque foreign inclusions less than 0,15 mm shall not be counted Opaque foreign inclusions between 0,50 mm and 0,15 mm shall average no more than two spots per 300 mm ì 300 mm area; ã voids (sealed voids or surface void) have a longest dimension less than 0,075 mm and there shall not be more than three voids in a 3,5 mm diameter circle 7.2 Flexural strength When the laminate is tested in accordance with test method 2M20 of IEC 61189-2 the flexural strength shall be as shown in Table Table – Flexural strength Property Flexural strength Length direction Cross direction (applicable to sheets ≥1,0 mm in thickness) Test method (IEC 61189-2) Requirements ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 2M20 ≥400 N/mm ≥300 N/mm Flexural strength Length direction Not specified Elevated temperature (applicable to sheets ≥1,0 mm in thickness) 7.3 Flammability When the laminate is tested in accordance with test method 2C08 (thickness ≥0,05 mm ≤0,3 mm) or 2C06 (thickness >0,3 mm ≤ 3,2 mm) of IEC 61189-2, the flammability shall be as shown in Table The performance labelled V-0 shall be in effect unless otherwise noted on the purchase order BS EN 61249-2-35:2009 61249-2-35 © IEC:2008 – 14 – Table – Flammability Requirements Test method (IEC 61189-2) Property Designation V-0 Flammability: 2C06 Flaming combustion time after each application of the flame for each test specimen ≤10 s Total flaming combustion time for the 10 flame applications for each set of five specimens ≤50 s Glowing combustion time after the second removal of the test flame ≤30 s Flaming or glowing combustion up to the holding clamp None Dripping flaming particles that ignite the tissue paper None 7.4 Water absorption When the laminate is tested in accordance with test method 2N02 of IEC 61189-2, the maximum water absorption shall be as shown in Table 10 Table 10 – Water absorption Property Water absorption 7.5 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Test method (IEC 61189-2) Thickness mm Requirements % 2N02 ≥0,05