1、BRITISH STANDARDBS EN 61249-4-1:2008Materials for printed boards and other interconnecting structures Part 4-1: Sectional specification set for prepreg materials, unclad (for the manufacture of multilayer boards) Epoxide woven E-glass prepreg of defined flammabilityICS 31.180g49g50g3g38g50g51g60g44g
2、49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 61249-4-1:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee o
3、n 31 July 2008 BSI 2008ISBN 978 0 580 53315 0National forewordThis British Standard is the UK implementation of EN 61249-4-1:2008. It is identical to IEC 61249-4-1:2008. The UK participation in its preparation was entrusted to Technical Committee EPL/501, Electronic assembly technology.A list of org
4、anizations 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.Compliance with a British Standard cannot confer immunity from legal obligat
5、ions.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARD EN 61249-4-1 NORME EUROPENNE EUROPISCHE NORM May 2008 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Cen
6、tral Secretariat: rue de Stassart 35, B - 1050 Brussels 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61249-4-1:2008 E ICS 31.180 English version Materials for printed boards and other interconnecting structures - Part 4-1:
7、 Sectional specification set for prepreg materials, unclad (for the manufacture of multilayer boards) - Epoxide woven E-glass prepreg of defined flammability (IEC 61249-4-1:2008) Matriaux pour circuits imprims et autres structures dinterconnexion - Partie 4-1: Srie de spcifications intermdiaires pou
8、r matriaux primprgns, non plaqus (pour la fabrication des circuits multicouches) - Tissu de verre poxyde primprgn de type E dinflammabilit dfinie (CEI 61249-4-1:2008) Materialien fr Leiterplatten und andere Verbindungsstrukturen - Teil 4-1: Rahmenspezifikationen fr unkaschierte Prepreg-Materialien (
9、zur Herstellung von Mehrlagenleiterplatten) - Mit E-Glasgewebe verstrkte Epoxidharz-Prepregs mit definierter Brennbarkeit (IEC 61249-4-1:2008) This European Standard was approved by CENELEC on 2008-04-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate t
10、he 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 exis
11、ts 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 elect
12、rotechnical 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, Switzer
13、land and the United Kingdom. Foreword The text of document 91/739/FDIS, future edition 1 of IEC 61249-4-1, prepared by IEC TC 91, Electronics assembly technology, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61249-4-1 on 2008-04-01. The following dates were fixed:
14、 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2009-01-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2011-04-01 Annex ZA has been added by CENELEC. _ End
15、orsement notice The text of the International Standard IEC 61249-4-1:2008 was approved by CENELEC as a European Standard without any modification. _ BS EN 61249-4-1:2008 2 CONTENTS 1 Scope.5 2 Normative references .5 3 Materials and construction5 3.1 Reinforcement.6 3.2 Epoxide resin 6 4 Properties.
16、6 4.1 Properties related to the appearance of the prepreg6 4.1.1 Dewetted areas (fish eyes) 6 4.1.2 Broken filaments6 4.1.3 Distortion.6 4.1.4 Creases.6 4.1.5 Edge conditions.6 4.2 Properties related to B stage prepreg 7 4.2.1 Resin content 7 4.2.2 Treated weight.7 4.2.3 Resin flow .7 4.2.4 Scaled f
17、low thickness 7 4.2.5 Melting viscosity 8 4.2.6 Gel time.8 4.2.7 Volatile content8 4.3 Properties of prepregs after curing to C stage .8 4.3.1 Electric strength 8 4.3.2 Flammability8 4.3.3 Relative permittivity and dissipation factor .9 4.3.4 Cured thickness.9 5 Delivery form 9 5.1 Rolls9 5.2 Sheets
18、.9 5.3 Cut panels.9 6 Quality assurance.10 6.1 Quality system.10 6.2 Responsibility for inspection10 6.3 Qualification inspection .10 6.4 Quality conformance inspection.10 6.5 Certificate of conformance.10 6.6 Safety data sheet 10 7 Packaging and marking 10 8 Shelf life.11 9 Ordering information.11
19、BS EN 61249-4-1:2008 3 blankBibliography12 Table 1 Flammability9 corresponding European publications 13 BS EN 61249-4-1:2008Annex ZA (normative) Normative references to international publications with their 4 MATERIALS FOR PRINTED BOARDS AND OTHER INTERCONNECTING STRUCTURES Part 4-1: Sectional speci
20、fication set for prepreg materials, unclad (for the manufacture of multilayer boards) Epoxide woven E-glass prepreg of defined flammability 1 Scope This part of IEC 61249 gives requirements for properties of prepreg that is mainly intended to be used as bonding sheets in connection with laminates ac
21、cording to IEC 61249-2-7 when manufacturing multilayer boards in line with IEC 62326-4. This material may be also used to bond other types of laminates. Prepreg according to this standard is of defined flammability (vertical burning test). The flammability rating on fully cured prepreg is achieved t
22、hrough the use of brominated fire retardants contained as an integral part of the polymeric structure. After lamination according to the suppliers instructions, the glass transition temperature is defined as being 120 C minimum. 2 Normative references The following referenced documents are indispens
23、able 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
24、 structures and assemblies Part 2: Test methods for materials for interconnection structures IEC 61189-3:1997, Test methods for electrical materials, printed boards and other interconnection structures and assemblies Part 3: Test methods for interconnection structures (printed boards) IEC 61249-2-7:
25、2002, Materials for printed boards and other interconnecting structures Part 2-7: Reinforced base materials clad and unclad Epoxide woven E-glass laminated sheet of defined flammability (vertical burning test), copper-clad IEC 62326-4, Printed boards Part 4: Rigid multilayer printed boards with inte
26、rlayer connections Sectional specification ISO 9000:2005, Quality management systems Fundamentals and vocabulary ISO 11014-1:1994, Safety data sheet for chemical products Part 1: Content and order of sections ISO 14001:2004, Environmental management systems Requirements with guidance for use 3 Mater
27、ials and construction The prepreg consists of a reinforcing E-glass fabric which is impregnated with epoxide resin and partially cured to the B stage. BS EN 61249-4-1:2008 5 3.1 Reinforcement NOTE Woven E-glass is intended to be specified in the future IEC 61249-6-3. 3.2 Epoxide resin Majority di-fu
28、nctional epoxide resin with a glass transition temperature of 120 C when cured according to the manufacturers recommendation. Contrast agents may be added to enhance processing such as optical inspection. Its flame resistance is defined in terms of the flammability requirements of 4.3.2. 4 Propertie
29、s 4.1 Properties related to the appearance of the prepreg The prepreg shall be substantially free from defects that may have an impact on the materials fitness for use for the intended purpose. For the following specific defects, the requirements given shall apply when inspection is made in accordan
30、ce with IEC 61189-3, method 3V01: Visual examination 3 magnification. 4.1.1 Dewetted areas (fish eyes) Dewetted areas with a diameter 5 mm are not permissible. Dewetted areas with a diameter 5 mm are permitted to an extent of a maximum 10 fish eyes in any 300 mm 300 mm area of the prepreg. 4.1.2 Bro
31、ken filaments When judging the presence of broken filaments their sizes and frequency of occurrence are important for assessing acceptability but also the flow characteristic of the prepreg must be taken into consideration. The acceptance conditions for broken filaments shall be as agreed upon betwe
32、en the user and supplier. 4.1.3 Distortion When the prepreg is tested in accordance with test method 2M29 the distortion of the fill yarns in the glass fabric shall not exceed 10 % measured over any 300 mm test distance. NOTE 2M29 is intended to be specified in a future edition of IEC 61189-2. 4.1.4
33、 Creases Creases caused by handling of the prepreg where only a negligible loss of resin has occurred are permitted. Creases where the glass yarns are exposed due to loss of resin are not permitted. 4.1.5 Edge conditions Cut-to-size panels shall have even edges and shall not show loss of resin at th
34、e edge due to the cutting process more than 2 mm. Excessive occurrence of resin dust released during the cutting shall be removed before packaging for shipment. BS EN 61249-4-1:2008 6 4.2 Properties related to B stage prepreg A number of characteristics can describe thickness, reactivity and rheolog
35、y of B stage prepreg. The choice of characteristics to be used as qualification and quality conformance testing as well as the nominal performance levels are as agreed upon between the user and supplier. Several of the characteristics shown below are interrelated and should not be specified individu
36、ally. Ordering requirements should preferably be restricted to the glass style, one characteristics marked (a) in combination with one characteristic marked (b). A maximum of one optional characteristic (c) of B stage prepreg may be included. Glass style Thickness parameter Resin content (a) Treated
37、 weight (a) Reactivity/rheology parameter Resin flow (b) Scaled flow thickness (b) Melt viscosity (b) Cured thickness (b) Optional parameter Volatile content (c) Gel time (c) 4.2.1 Resin content When tested in accordance with test method 2C03 or 2C10 of IEC 61189-2, the nominal resin content shall b
38、e as agreed upon between the user and supplier. The tolerance around the ordered nominal value shall be 3 %, e.g. (45 3) %. 4.2.2 Treated weight When tested in accordance with test method 2C03 of IEC 61189-2, the nominal treated weight shall be as agreed upon between the user and supplier. The toler
39、ance around the ordered nominal value shall be 3 %, e.g. (16,8 0,5) g. 4.2.3 Resin flow When tested in accordance with test method 2M09 of IEC 61189-2, the nominal resin flow shall be as agreed upon between the user and supplier. The tolerance around the ordered nominal value shall be 5 %, e.g. (25
40、5) %. 4.2.4 Scaled flow thickness When tested in accordance with test method 2M26 of IEC 61189-2, the nominal scaled flow and the tolerance shall be as agreed upon between the user and supplier. BS EN 61249-4-1:2008 7 4.2.5 Melting viscosity When tested in accordance with test method 2C09 of IEC 611
41、89-2, the nominal melt viscosity shall be as agreed upon between the user and supplier. The tolerance around the ordered nominal value shall be 20 mPa s, e.g. (240 20) mPa s. 4.2.6 Gel time When tested in accordance with test method 2C02 of IEC 61189-2, the nominal gel time shall be as agreed upon b
42、etween the user and supplier. The tolerance around the ordered nominal value shall be 20 s, e.g. (160 20) s. 4.2.7 Volatile content When tested in accordance with test method 2C04 of IEC 61189-2, the volatile content shall be 0,5 % maximum. 4.3 Properties of prepregs after curing to C stage 4.3.1 El
43、ectric strength A total of 2 plies of prepreg of minimum size 300 mm 300 mm shall be bonded together and cured in accordance with the manufacturers recommendations whereupon the thickness shall be determined using a micrometer. When tested in accordance with test method 2E11 of IEC 61189-2, the mini
44、mum electric strength shall be 25 V/m. 4.3.2 Flammability A number of plies of minimum size 300 mm 300 mm of the prepreg under test shall be bonded together and cured in accordance with the manufacturers recommendations. The number of plies shall be chosen so that a specimen thickness of 0,4 mm 0,5
45、mm is obtained as measured with a micrometer. When tested in accordance with test method 2C06 of IEC 61189-2, the flammability shall meet the requirements as shown in Table 1. BS EN 61249-4-1:2008 8 Table 1 Flammability Requirement Designation Property Test method IEC 61189-2 FV0 FV1 Flammability (v
46、ertical burning test): nominal material thickness 0,4 mm 1. Flaming combustion time after each application of the flame for each test specimen 2C06 10 s 30 s 2. Total flaming combustion time for the 10 flame applications for each set of five specimens 50 s 250 s 3. Glowing combustion time after the
47、second removal of the flame 30 s 60 s 4. Flaming or glowing combustion up to the holding clamp None None 5. Dripping flaming particles that ignite the tissue paper None None 4.3.3 Relative permittivity and dissipation factor A total of 2 plies of prepreg of minimum size 300 mm 300 mm shall be bonded
48、 together and cured in accordance with the manufacturers recommendations whereupon the thickness shall be determined using a micrometer. When tested in accordance with test method 2E10 of IEC 61189-2, the relative permittivity and dissipation factor shall be 5,4 and 0,035 minimum, respectively. 4.3.
49、4 Cured thickness The nominal thickness and the tolerance of the cured prepreg using the users lamination cycle shall be as agreed upon between the user and supplier. 5 Delivery form Prepreg may be ordered and delivered as rolls, sheets or cut panels. 5.1 Rolls Roll sizes shall be as agreed upon between the user and supplier. For rolls 50 m in length, cut-outs from quality conformance inspection are allowed. The size of the roll delivered
