1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationSpecification for finished fabric woven from “E” glass for printed boardsDD IEC/PAS 61249-6-3:2011National forewordThis Draft for Development is the UK implementation of IEC/PAS
2、61249-6-3:2011.This publication is not to be regarded as a British Standard.It is being issued in the Draft for Development series of publications and is of a provisional nature. It should be applied on this provisional basis, so that information and experience of its practical application can be ob
3、tained.A PAS is a Technical Specification not fulfilling the requirements for a standard, but made available to the public and established in an organization operating under a given procedure.A review of this Draft for Development will be carried out not later than three years after its publication.
4、Notification of the start of the review period, with a request for the submission of comments from users of this Draft for Development, will be made in an announcement in the appropriate issue of Update Standards. According to the replies received, BSI Technical Committee EPL/501 will judge whether
5、the validity of the PAS should be extended for a further three years or what other action should be taken and pass their comments on to the relevant international committee.Observations which it is felt should receive attention before the official call for comments will be welcomed. These should be
6、sent to the Secretary of BSI Technical Committee EPL/501 at British Standards House, 389 Chiswick High Road, London W4 4AL.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
7、 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 2011ISBN 978 0 580 53907 7ICS 31.180Compliance with a British Standard cannot confer immunity from legal obligations.T
8、his Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 30 November 2011.Amendments issued since publicationAmd. No. Date Text affectedDRAFT FOR DEVELOPMENTDD IEC/PAS 61249-6-3:2011IEC/PAS 61249-6-3 Edition 1.0 2011-09 PUBLICLY AVAILABLE SPECIFIC
9、ATION Specification for finished fabric woven from “E”glass for printed boards INTERNATIONAL ELECTROTECHNICAL COMMISSION T ICS 31.180 PRICE CODE ISBN 978-2-88912-699-6 Registered trademark of the International Electrotechnical Commission DD IEC/PAS 61249-6-3:2011 2 PAS 61249-6-3 IEC:2011(E) CONTENTS
10、 FOREWORD . 4 1 Scope . 6 1.1 Purpose 6 1.2 Designation . 6 2 Normative references . 6 2.1 IPC 6 2.2 American Society for Testing and Materials (ASTM) 6 2.3 International Standards . 6 2.4 National Conference of Standards Laboratories (NCSL) 6 3 Terms and definitions . 6 4 Requirements . 9 4.1 Yarn
11、nomenclature 9 4.1.1 US system . 9 4.1.2 SI/metric 9 4.1.3 Conversion from US system to SI 10 4.2 Visual requirements . 10 4.3 Physical requirements . 10 4.3.1 Fabric count 10 4.3.2 Weave type . 10 4.3.3 Fabric thickness 10 4.3.4 Fabric weight . 10 4.3.5 Fabric length . 10 4.3.6 Fabric width . 11 4.
12、3.7 Feather length . 11 4.3.8 Filament diameter 11 4.3.9 Bare glass nominal measurement 12 4.4 Chemical requirements 12 4.4.1 Finish level (organic content) . 12 4.5 Workmanship 12 4.6 Laser machinability performance . 12 4.7 Alternate fabric styles and weaves 12 5 Quality assurance . 13 5.1 Statist
13、ical process control (SPC) . 13 5.2 Responsibility for inspection 13 5.2.1 Test equipment and inspection facilities 14 5.2.2 Preparation of samples 14 5.2.3 Standard laboratory conditions 14 5.3 Inspection requirements and acceptability . 14 5.3.1 Sample size . 14 5.3.2 Sampling plans 15 5.3.3 Accep
14、table quality level (AQL) . 15 5.4 Test methods 15 5.4.1 Fabric appearance . 15 5.4.2 Fabric count 15 5.4.3 Weave type . 16 5.4.4 Fabric thickness 16 DD IEC/PAS 61249-6-3:2011PAS 61249-6-3 IEC:2011(E) 3 5.4.5 Weight per unit area 16 5.4.6 Fabric length . 17 5.4.7 Fabric width . 17 5.4.8 Finish level
15、 (organic content) . 17 5.4.9 Bias or bowed filling 17 6 Preparation for delivery 18 6.1 Preservation and packaging 18 6.2 Packing . 18 6.3 Marking . 18 7 Notes . 18 7.1 Ordering data 18 7.2 New Styles 18 Annex A 19 Annex B Finished Fabric Glass Styles . 21 Table 1 Classification of Defects 11 Table
16、 2 Filament Diameter Designations 11 Table 3 Bare Glass Nominal Measurements . 12 Table 4 Sample Size per Number of Rolls Shipped 14 Table 5 Sample size per yardage of individual roll shipped and the acceptable quality level 14 Table A.1 Cross Reference Between IPC-4412, Standards Called Out by IPC-
17、4412, and ISO Documents 19 Table A.2 Cross Reference Between IPC-4412, ASTM and ISO Documents. 19 Table B.1 Finished Fabric Glass Styles in SI Units . 21 Table B.2 Finished Fabric Glass Styles for US System 24 DD IEC/PAS 61249-6-3:2011 4 PAS 61249-6-3 IEC:2011(E) INTERNATIONAL ELECTROTECHNICAL COMMI
18、SSION _ SPECIFICATION FOR FINISHED FABRIC WOVEN FROM “E”GLASS FOR PRINTED BOARDS FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to prom
19、ote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides
20、(hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also
21、 participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possib
22、le, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. Whil
23、e all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake t
24、o apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestatio
25、n of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of thi
26、s publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or ind
27、irect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for t
28、he correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. A PAS is a technical specification not fulfilli
29、ng the requirements for a standard, but made available to the public. IEC-PAS 61249-6-3 has been processed by IEC technical committee 91: Electronics assembly technology. The text of this PAS is based on the following document: This PAS was approved for publication by the P-members of the committee
30、concerned as indicated in the following document Draft PAS Report on voting 91/956/PAS 91/961/RVD Following publication of this PAS the technical committee or subcommittee concerned may transform it into an International Standard. DD IEC/PAS 61249-6-3:2011PAS 61249-6-3 IEC:2011(E) 5 This PAS shall r
31、emain valid for an initial maximum period of 3 years starting from the publication date. The validity may be extended for a single period up to a maximum of 3 years, at the end of which it shall be published as another type of normative document, or shall be withdrawn. DD IEC/PAS 61249-6-3:2011 6 PA
32、S 61249-6-3 IEC:2011(E) SPECIFICATION FOR FINISHED FABRIC WOVEN FROM “E”GLASS FOR PRINTED BOARDS 1 Scope This specification covers finished fabrics woven from :E” glass electrical grade glass fiber yarns that are intended as a reinforcing material in laminated plastics for electrical and electronic
33、use. All fabrics covered by this specification are plain weave. 1.1 Purpose This specification determines the nomenclature, definitions, general and chemical requirements for the glass, and physical requirements for finished woven glass fiber fabrics. 1.2 Designation Appendix II of this standard pro
34、vides a style designator for each finished fabric glass style, with specifications on yarn, fabric count, thickness and weight in both SI and US system. Fabrics listed in Appendix II also categorize fabrics by their current availability status. 2 Normative references The following referenced documen
35、ts 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. 2.1 IPC IPC-T-50, Terms and Definitions for Interconnecting and Packaging Electro
36、nic Circuits IPC-9191, General Guidelines for Implementation of Statistical Process Control (SPC) 2.2 American Society for Testing and Materials (ASTM) ASTM-D578, Standard Specification for Glass Fiber Strands ASTM-D1776, Standard Practice for Conditioning Testing Textiles 2.3 International Standard
37、s ISO 9001, Quality Management Systems Requirements 2.4 National Conference of Standards Laboratories (NCSL) NCSL Z 540-1, General Requirements for Calibration Laboratories and Measuring and Test Equipment 3 Terms and definitions The definition of terms shall be in accordance with IPC-T-50 and the f
38、ollowing: DD IEC/PAS 61249-6-3:2011PAS 61249-6-3 IEC:2011(E) 7 3.1 AQL (Acceptable Quality Level) maximum number of defects per hundred units that can be considered satisfactory as a process average 3.2 bias filling yarns are off-square to the warp ends 3.3 bow filling yarns lie in an arc across the
39、 width of the fabric 3.4 creases a ridge in the fabric caused by a fold or wrinkle being placed under pressure 3.5 defects a substandard area in a fabric 3.6 major defect a defect that is likely to result in failure, or to reduce materially the usability of the unit of product for its intended purpo
40、se 3.7 minor defect a defect that is not likely to reduce materially the usability of the unit of product for its intended purpose. 3.8 defect per hundred units 3.9 E glass (electrical grade glass fiber) E glass, which is to be used for PWB applications, is a continuous filament glass yarn with a ch
41、emical composition by weight that is within the following limits: B2O35 %10 % CaO 16 %25 % Al2O312 %16 % SiO252 %56 % MgO 0 %5 % Na2O and K2O 0 %2 % TiO20 %0.8 % Fe2O30.05 %0.4 % F20 %1.0 % Composition is to be certified by yarn supplier as requested. DD IEC/PAS 61249-6-3:2011 8 PAS 61249-6-3 IEC:20
42、11(E) 3.10 end missing a very small portion of the warp in the fabric that may have been broken in the pick-out of waste 3.11 feather length length of distance from last warp end to the end of the pick 3.12 fabric finish treatment of fabric to aid in compatibility with resins 3.13 fish eye small are
43、a of fabric which resists resin wetting and can be caused by the resin system, fabric and treatment 3.14 leno end out missing wrapper warp end from the edge of the fabric 3.15 lot or batch size a collection of units produced in one continuous, uninterrupted finish run from which a sample is drawn an
44、d inspected or tested to determine conformance with the acceptability criteria 3.16 mark heavy or light area in fabric due to excessive or less filling yarns 3.17 heavy mark a filling defect extending across the width of the fabric containing two picks/inch in excess of the nominal count 3.18 light
45、mark a filling defect extending across the width of the fabric containing two picks/inch less than the nominal count 3.19 pick filling yarn running crosswise the entire width of a fabric 3.20 broken pick a filling yarn missing from a portion of the width of the fabric 3.21 mis-picks break in the pat
46、tern of cloth from selvage to selvage caused by a missing filling yarn 3.22 plain weave a fabric configuration where each warp end should go over one pick and under the next, and each pick should go over one warp end and under the next DD IEC/PAS 61249-6-3:2011PAS 61249-6-3 IEC:2011(E) 9 3.23 splits
47、 an opening in the fabric resulting from either the pick or end breaking in two. This is usually caused by the fabric folding over and creasing 3.24 tears a large rip in the fabric usually caused by excessive tension being applied during processing. Could be caused by weak fabric 3.25 TEX system a s
48、ystem for expressing linear density of yarn or other textile strand. The unit is equivalent to grams/kilometer. 3.26 waste a lump or collection of yarn or filament woven into the fabric where accumulated contamination off the loom has found its way into the fabric 3.27 waviness cloth is woven under
49、varying tensions preventing even placement of picks resulting in alternating thick and thin places 4 Requirements 4.1 Yarn nomenclature There are two systems of identifying fiber glass yarns: the US system and system international (SI)/metric. Consider the following exmple: ECD 450 1/2 in US system or EC5 11 1x2 in SI. 4.1.1 US system For the ECD in ECD 450 1/2, the first letter represents the grade of glass; the second indicates whether the yarn is continuous (“C”) o
