1、BRITISH STANDARD Materials for printed boards and other interconnecting structures - Part 3-5: Sectional specification set for unreinforced base materials, clad and unclad (intended for flexible printed boards) - Tlransfer adhesive films for flexible printed boards The European Standard EN 612493-51
2、999 has titc status of a British Standard ICS 31.180 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 61249-3-51999 EC 61249-3-5:1999 STD*BSI BS EN bLZV7-3-5-ENGL L777 W Lb24bb7 07855bb b23 M direction of the Electmtechnicai md. No. Sector Conunime, was published under th
3、e authority of the Standards Committee and comes into effect on i5 June 1999 BS EN 612493-5:1999 Da Comments National foreword This British Standard is the Engiish language version of EN 612493-51999. It is identical with IEC 6124435: 1999. The UK participation in its preparation was entrusted to Te
4、chnical Committee EPiAXl, Electronic assembly technology, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible intemationaEuropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed, - monitor re
5、lated intemationai and European developments and promulgate them in the UK. A iist of organizations represented on this committee can be obtained on request to its secrekq From 1 January 1997, ali IEC pubiidons have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered
6、 as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact hat CEN and CENELEC Standards nody include an annex which lists nonnative references to interna
7、tional publications with their corresponding European pubiications. The British Standards which implement intemationai or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitied “Intmationai Standards Correspondence Index“, or by usin
8、g the “Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include al the necessary provisions of a contract Users of British Standads are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity fro
9、m legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 13 and a back cover. . y. . .J O BSI 06-1999 ISBN O 580 32526 1 I EIJROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61 249-3-5 April 1999 ICC 31.180 English version M
10、aterials for printed boards and other interconnecting structures Part 3-5: Sectional specification set for unreinforced base materials, clad and unclad (intended for flexible printed boards) Transfer adhesive films (IEC 61 249-3-511999) Matriaux pour circuits imprims et autres structures dinterconne
11、xion Partie 3-5: Collection de spcifications intermdiaires pour les matriaux de base non renforcs, recouverts ou non (prvus pour les ciruits imprims flexibles) - Films transfert de colle (CE1 61 249-3-511 999) Materialien fr Leiterplatten und andere Verbindungsstru kturen Teil 3-5: Rahmenspezifikati
12、on fr unverstrkte, kaschierte und unkaschierte Basismaterialien (fr flexible Leiterplatten) Transfer-Kleberfilme fr flexible Leiterplatten (IEC 61 249-3-51999) This European Standard was approved by CENELEC on 1999-04-01. CENELEC members are bound to comply with the CENICENELEC Internai Regulations
13、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 Europ
14、ean Standard exists in three official versions IEnglish, 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 t
15、he national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland. Ireland. Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization C
16、omit Europen de Normalisation Electrotechnique Europisches Komitee 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. EN 61 249-3-51 999 E
17、Page 2 EN 61249-3-5:1999 Foreword The text of document 52/774/FDIS, future edition 1 of IEC 61249-3-5, prepared by IEC TC 52, Printed circuits, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61 249-3-5 on 1999-04-01. The following dates were fixed: - latest date by
18、which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2000-01-01 - latest date by which the national standards conflicting with the EN have to be withdrawn (daw) 2002-01 -01 Annexes designated “normative“ are part of the body of
19、 the standard. Annexes designated “informative“ are given for information only. In this standard, annex ZA is normative and annex A is informative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC 61 249-3-5: 1 999 was approved by CENELEC as a Europea
20、n Standard without any modification. Page 3 EN 61249-3-51999 CONTENTS Clause 1 Scope , 2 Normative references 3 Materials and construction .,., 4 Internal marking 5 Designation 6 Properties of adhesive films . . 7 Dimensions and tolerances . 8 Packaging and marking . 9 Acceptance testing Page 4 4 4
21、5 5 5 0 0 8 Annex A (informative) Conversion table for test method reference numbers . 9 Annex ZA normative) Normative references to international publications with their corresponding European publications . 13 O BSI 06-1 999 Page 4 EN 61249-3-5:1999 MATERIALS FOR PRINTED BOARDS AND OTHER INTERCONN
22、ECTING STRUCTURES - Part 3-5: Sectional specification set for unreinforced base materials, clad and unclad (intended for flexible printed boards) - Transfer adhesive films 1 Scope This part of IEC 61249 gives requirements for transfer adhesive films for use in the fabrication of flexible multilayer
23、boards or flex-rigid printed boards. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 61249. At the time of publication, the editions indicated were valid. All normative documents are subject
24、to revision, and parties to agreements based on this part of IEC 61249 are encouraged to investigate the possibility of applying the most recent editions of the normative documents listed below. Members of IEC and IS0 maintain registers of currently valid International standards. IEC 60249-1 :1982,
25、Base materials for printed circuits - Part I: Test methods IEC 60249-2-8:1987, Base materials for printed circuits - Par 2: Specifications - Specification No. 8: Flexible copper-clad polyester (PETP) film IEC 60249-2-1 3:1987, Base materials for printed circuits - Part 2: Specifications - Specificat
26、ion No. 13: Flexible copper-clad polyimide film, general purpose grade IEC 60249-2-1 5:1987, Base materials for printed circuits - Part 2: Specifications - Specification No. 15: Flexible copper-clad polyimide film of defined flammability IEC 61 189-2: 1 997, Test methods for electrical material inte
27、rconnection structures and assemblies - Part 2: Test methods for materials for interconnection structures 3 Materials and construction The materials consist of adhesive layers based on B-staged epoxide, acrylic or polyester (PET) resin supported by a removable paper carrier and protected by a polyme
28、ric release film which shall adhere until lamination. The adhesive on epoxide or acrylic base shall be compatible with the copper-clad polyimide films according to IEC 60249-2-13 and IEC 60249-2-15; the adhesive on polyester (PET) base shall be compatible with the copper-clad polyester films accordi
29、ng to IEC 60249-2-8. The thickness of the adhesive films shall be between 12.5 pm and 75 pm, with a permissible tolerance of i20 % when measured by the method of 3.14 of IEC 60249-1, provided that the micrometer used is capable of resolving 0,002 mrn or better. Preferred thicknesses are 25 pm and 50
30、 pm. 43 Other thicknesses may be used by agreement between purchaser and supplier. Page 5 EN 61249-3-51999 The thickness of the adhesive film is defined as follows: Ta = Tt - Tp where Ta is the thickness of the adhesive film; Tt is the average value of the total thickness of the material under test,
31、 including the paper carrier and protective material; Tp is the average value of the thickness of the paper carrier and protective material. Thickness values Tt and Tp shall be measured as described in 3.14 of IEC 60249-1. 4 Internal marking Not applicable. 5 Designation The following code shall be
32、used to designate adhesive films according to this specification: Example: PET - IEC 61249-3-5 -A - 25 - 50 - O - RI1 film material I specification no. type of adhesive (A = acrylic, E = epoxide, P = polyester) J adhesive thickness on side 1 (mm) film thickness (mm) adhesive thickness on side 2 (rnr
33、n) Flammability rating (see table 3) If there is no risk of confusion, the designation may be abbreviated to read (the same example as above): E-IEC-12,5. 6 Properties of adhesive films 6.1 Appearance The adhesive film shall be free from blisters and wrinkles. There shall be no imperfections which w
34、ill 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 in accordance with the manufacturers instructions. Page 6 EN 61249-3-5:1999 Property Surface res
35、istance after damp heat white in the humidity chamber (optional) Surface resistance after damp heat and recovery Volume resistivity after damp heat while in the humidity chamber (optional) The appearance of the adhesive film shall only be inspected with protective material present in cases where the
36、 protective material is transparent. Where foreign inclusions appear to be imbedded in the adhesive and/or between the adhesive and the protective materials, the protective materials shall be removed and the adhesive film shall be re-inspected. Test method Requitemen t 2E03 lo3 MR min. (rubclause of
37、 IEC 60240-1) 2E03 lo4 Mn min. 2E04 lo3 MQm min. 6.2 6.2.1 Preparation of laminated specimens In order to determine the properties listed in 6.2.2 and 6.2.3, laminated samples shall be prepared as follows. Properties of adhesive films after curing 6.2.1.1 Specimens from cover sheets Test specimens,
38、unless for peel strength or heat shock testing, shall comply with the requirements of IEC 60249-1. 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
39、with 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 of 35 pm (305 g/m2) and shall be applied with the untreated (shiny) side to the adhesive layer. Samples
40、for peel strength or heat shock testing shall be prepared by laminating with a single- sided epoxiddglass laminate on one side of the adhesive film, and with unclad epoxide/glass laminate on the second side. The minimum thickness of the unclad laminate shall be 0,5 mm. In all other respects, sample
41、preparation shall be as detailed above. If any argument arises in relation to the laminating conditions, it is desirable to apply the standard procedures and conditions in the relevant test method specification (see IEC 61 189-2) by agreement between purchaser and supplier. 6.2.2 Electrical properti
42、es Table 1 - Electrical properties I Volume resistivity after damp heat I and recovery lo4 MRm min. I 2E04 Surface corrosion I 2E08 No visible corrosion products I in the gap 2E10 I Relative permittivity after damp heat I and recovery (optional) 43 max. I 2E10 I Dielectric dissipation factor after I
43、 damp heat and recovery (optional) 0,05 max. I 60 kV/mm min. I Electrical strength I 2E11 I Page 7 EN 61249-3-5:1999 Test method Requlrsmant IEC 61 189-2 Acrylic or epoxlde bass I Polyester basa Peel strength after dry heat at 125 OC (optional) listering after 10 s heat Ishock 6.2.3 Non-electrical p
44、roperties 6.2.3.1 Properties related to the copper foil bond Table 2 - Properties related to the copper foil bond 2M17 Not less than 0,35 Nlmm Not applicable 2 PO2 As agreed upon between supplier and purchaser Property Property Flammability of films 50 bm thick or greater when used in combination wi
45、th material specified in IEC 61249-3-2 l) Test method Requirsmsnt IEC 81160-2 2C08 As agreed upon between supplier and purchaser or that the flammabil- ity rating of the base material (IEC 61249-3-2) is not increased I Peel strength as received I 2M13 I Not less than 0,7 N/mm I Not less than 0.8 Nim
46、m I Acrylic or epoxide ba8e I I Not less than 0,6 Nlmm Not less than 0.6 Nlmm I 2M14 I Peel strength after heat I shock of 10 s Polyester base 0.25 0,30 0.30 0,40 0.45 I 6.2.3.2 Flammability Table 3 - Flammability 6.2.3.3 Water absorption Not specified. 6.3 Other properties before curing 6.3.1 Dimen
47、sional stability Not specified. 6.3.2 Adhesive flow during lamination Table 4 - Adhesive flow Property Adhesive flow Clearance filling with adhesive Test method (subclause of IEC 61189-2) (Under consideration) (Under consideration) Adheslve thicknesr Pm 12.5 20 25 50 75 0,15 0,20 0,20 0,30 0,35 No v
48、oid shall remain in the testing areas of test specimens Under consideration. Page 8 EN 61249-3-5:1999 Film material supplied in rolls as manufactured Film material SuODiied in rolls slit to a soecified width 6.3.3 Volatile content I5 *1 Not specified. 7 Dimensions and tolerances Transfer adhesive fi
49、lms are 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 not tightly on cores having an internal diameter not less than 75 mm. The standard length of the rolls shall be 50 m, 75 m or 100 rn. 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 the following values. Table 5 - Tolerances for the width of film material supplied in rolls Film material deliver
