1、BRITISH STANDARD BS EN 61249-3-4:1999 IEC 61249-3-4:1999 Materials for printed boards and other interconnecting structures Part 3-4: Sectional specification set for unreinforced base materials, clad and unclad (intended for flexible printed boards) Adhesive coated flexible polyimide film The Europea
2、n Standard EN 61249-3-4:1999 has the status of a British Standard ICS 31.180BSEN61249-3-4:1999 This British Standard, having been prepared under the directionof the Electrotechnical Sector Committee, was publishedunder the authority ofthe Standards Committee andcomes into effect on 15June1999 BSI 04
3、-2000 ISBN 0 580 32530 X National foreword This British Standard is the English language version of EN61249-3-4:1999. It is identical with IEC61249-3-4:1999. The UK participation in its preparation was entrusted to Technical Committee EPL/501, Electronic assembly technology, which has the responsibi
4、lity to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list o
5、f organizations represented on this committee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number60000 added to the old number. For instance, IEC27-1 has been renumbered as IEC60027-1. For a period of time during the change over from one numbering s
6、ystem to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The Brit
7、ish Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not pur
8、port 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 comprises a front cover, an inside front
9、cover, pagesi andii, theEN title page, pages2 to12 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. Amendments issued since publication Amd. No. Date CommentsBSEN61
10、249-3-4:1999 BSI 04-2000 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 61249-3-4 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN61249-3-4 April1999 ICS31.180 English version Materials for printed boards and other interconnecting structures Part 3-4: Section
11、al specification set for unreinforced base materials, clad and unclad (intended for flexible printedboards) Adhesive coated flexible polyimide film (IEC 61249-3-4:1999) Matriaux pour circuits imprims et autres structures dinterconnexion Partie 3-4: Collection de spcifications intermdiaires pourles m
12、atriaux de base non renforcs, recouverts ou non (prvus pour les circuits imprims flexibles) Film flexible de polyimide recouvert de colle (CEI 61249-3-4:1999) Materialien fr Leiterplatten und andere Verbindungsstrukturen Teil 3-4:Rahmenspezifikation fr unverstrkte, kaschierte und unkaschierte Basism
13、aterialien(fr flexible Leiterplatten) Kleberbeschichtete flexible Polyimidfolien (IEC 61249-3-4:1999) This European Standard was approved by CENELEC on1999-04-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Sta
14、ndard 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, Fr
15、ench, 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
16、, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches K
17、omitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1999 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN61249-3-4:1999 EEN61249-3-4:1999 BSI 04-2000 2 Foreword The text of document52/773/FDIS
18、, future edition1 of IEC61249-3-4, prepared by IEC TC52, Printed circuits, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN61249-3-4 on1999-04-01. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “
19、informative” are given for information only. In this standard,Annex ZA is normative andAnnex A is informative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC61249-3-4:1999 was approved by CENELEC as a European Standard without any modification. Cont
20、ents Page Foreword 2 1 Scope 3 2 Normative reference 3 3 Materials and construction 3 4 Internal marking 4 5 Designation 4 6 Properties of adhesive coated polyimide films 4 7 Dimensions and tolerances 6 8 Packaging and marking 7 9 Acceptance testing 7 Annex A (informative) Conversion table for test
21、method reference numbers 8 Annex ZA (normative) Normative references to international publications with their corresponding European publications 12 Table 1 Preferred thicknesses and maximum permitted tolerances 3 Table 2 Electrical properties 5 Table 3 Properties related to the copper foil bond 5 T
22、able 4 Flammability 6 Table 5 Dimensional stability of coverlays 6 Table 6 Adhesive flow 6 Table 7 Maximum tolerances for the width of film material supplied in rolls 7 latest date by which the ENhas to be implemented at national level by publication of an identical national standard or by endorseme
23、nt (dop) 2000-01-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2002-01-01EN61249-3-4:1999 BSI 04-2000 3 1 Scope This part of IEC61249 gives requirements for flexible polyimide films coated on one side or both sides with acrylic or epoxide type adhe
24、sive for use in the fabrication of flexible printed wiring. Films coated on only one side are used as a coverlay or covercoat in the fabrication of flexible printed wiring. This coverlay or covercoat is also used to provide local support to areas subjected to mechanical or environmental stress. Film
25、s coated on both sides are used as bonding films in the fabrication of printed boards. 2 Normative reference The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC61249. For dated references, subsequent amendments to, or
26、revisions of, any of these publications do not apply. However, parties to agreements based on this part of IEC61249 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normati
27、ve document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 61189-2:1997, Test methods for electrical materials, interconnection structures and assemblies Part 2: Test methods for materials for interconnection structures. 3 Materials and
28、 construction The material consists of an insulating flexible film base of polyimide coated with an adhesive on one side or both sides. 3.1 Insulating film Polyimide films of preferred thicknesses and permitted tolerances are given inTable 1 when measured by the method2D01 of IEC61189-2, provided th
29、at the micrometer used is capable of resolving0,002mm or better. Other thicknesses may be used by agreement between purchaser and supplier. The maximum permitted tolerances of such thicknesses shall be those of the nearest greater thickness stated inTable 1. Table 1 Preferred thicknesses and maximum
30、 permitted tolerances 3.2 Adhesive The adhesive shall be compatible with the copper-clad polyimide film. Relevant adhesives are B-staged adhesives based on acrylic or epoxy resin. The thickness of the adhesive is defined as follows: T a= T c T f where T a is the thickness of the adhesive; T c is the
31、 average value of the total thickness of the adhesive coated film under test; T f is the average value of the thicknesses of the insulation film under test without adhesive. Thickness values T cand T fshall be measured as described in3.1. Nominal thickness (without adhesive) Maximum tolerance at any
32、 measured point 4m % 12,5 30 25 20 50 15 75 10 125 10EN61249-3-4:1999 4 BSI 04-2000 The thickness of the adhesive shall be between12,54m and754m with a permissible tolerance of 20%. Preferred thicknesses are204m,25 4m,384m,504m, and754m. 4 Internal marking Not applicable. 5 Designation The following
33、 code shall be used to designate adhesive coated polyimide films according to this specification: If there is no risk of confusion, the designation may be abbreviated to read (the same example as above): PI-IEC-A-25-50-0-FV1. 6 Properties of adhesive coated polyimide films 6.1 Appearance The adhesiv
34、e coated film shall be free from blisters and wrinkles. There shall be no imperfections which will be detrimental to the material properties or to their intended use. The film shall be uniform in colour and free from foreign inclusions. Colour degradation shall not occur when the film is processed i
35、n accordance with the manufacturers instructions. The adhesive shall be protected by a polymeric release film or release paper which shall adhere until lamination. For polyimide films with adhesive on both sides, one adhesive layer or both shall be protected with such release materials. The appearan
36、ce of the adhesive coated film shall only be inspected with the release material present in cases where the release material is transparent. Where foreign inclusions appear to be imbedded in the adhesive and/or between the adhesive and the polyester film, the release material shall be removed and th
37、e coated film shall be re-inspected. 6.2 Properties of adhesive coated polyimide films after curing 6.2.1 Preparation of laminated specimens In order to determine the properties listed in6.2.2 and6.2.3, laminated specimens shall be prepared as follows.EN61249-3-4:1999 BSI 04-2000 5 6.2.1.1 Specimens
38、 from cover sheets Test specimens shall comply with the requirements of IEC61189-2 (seeAnnex A). They shall be cut from a set of samples prepared by laminating copper foil to the film material under test. Laminating conditions should be agreed upon between purchaser and supplier, and should comply w
39、ith the material manufacturers recommendations regarding pressure, temperature and pressing duration. The copper foil, as used in the fabrication of copper-clad laminates, shall have a thickness of354m (305 g/m 2 ) and shall be applied with the untreated (shiny) side to the adhesive layer. If any ar
40、gument arises in relation to the laminating conditions, it is desirable to apply the standard procedures and conditions in the relevant test method specification (see IEC61189-2) by agreement between purchaser and supplier. NOTEWhen the release or protective materials are peeled off from coverlay fi
41、lms with punched holes and/or slits for further fabrication processes, careful attention should be paid in order to avoid deformation of the film due to any excessive peeling force. 6.2.1.2 Specimens from bonding films The required test specimens according to the relevant clauses of IEC61189-2 shall
42、 be cut from a set of samples prepared by laminating copper foils to both sides of the film material under test as described in6.2.1.1, except for peel strength and heat shock testing. For peel strength and heat shock testing the samples shall be prepared by laminating a single-sided copper-clad epo
43、xide/glass laminate on one side of the adhesive coated bonding film, and an unclad epoxide/glass laminate with a thickness not less than0,5mm on the other side, as described in6.2.1.1. Two sets of samples shall be prepared: one with the copper foil facing side1 of the bonding film, one with the copp
44、er foil facing side2 of the bonding film. 6.2.2 Electrical properties Table 2 Electrical properties 6.2.3 Non-electrical properties 6.2.3.1 Properties related to the copper foil bond Table 3 Properties related to the copper foil bond Property Test method (IEC 61189-2) Requirement Surface resistance
45、after damp heat while in the humidity chamber (optional) 2E12 10 3M7 min. Surface resistance after damp heat and recovery 2E03 10 4M7 min. Volume resistivity after damp heat while in the humidity chamber (optional) 2E04 10 3M7m min. Volume resistivity after damp heat and recovery 2E04 10 4M7m min. S
46、urface corrosion 2E08 No visible corrosion products in the gap Relative permittivity after damp heat and recovery (optional) 2E10 4,5 max. Dielectric dissipation factor after damp heat and recovery (optional) 2E10 0,05 max. Electrical strength 2E11 60 kV/mm min. Property Test method (IEC 61189-2) Re
47、quirement Peel strength as received 2M13 Not less than 0,7 N/mm Peel strength after thermal shock of10 s 2M14 Not less than 0,6 N/mm Peel strength after dry heat at125 C (optional) 2M15 Not less than 0,35 N/mm Blistering after10 s thermal shock 2C05 No blistering or delaminationEN61249-3-4:1999 6 BS
48、I 04-2000 6.2.3.2 Flammability Table 4 Flammability 6.2.3.3 Water absorption Not specified. 6.3 Other properties before curing 6.3.1 Dimensional stability (coverlays only) Table 5 Dimensional stability of coverlays 6.3.2 Adhesive flow during lamination Table 6 Adhesive flow 6.3.3 Volatile content No
49、t specified. 7 Dimensions and tolerances Adhesive coated polyimide film is delivered only in rolls as manufactured or in rolls slit to a specified width as ordered by the purchaser. The materials shall be wound firmly but be easily removable on cores having an internal diameter not less than75mm. The standard length of the rolls shall be50m,75m or100m. The delivered length shall not be less than the nominal length. The tolerance from the nominal width of material supplied in rolls shall not exceed th
