IEC PAS 61249-6-3:2011

Specification for finished fabric woven from "E" glass for printed boards

IEC/PAS 61249-6-3:2011(E) 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 use. All fabrics covered by this specification are plain weave. This specification determines the nomenclature, definitions, general and chemical requirements for the glass, and physical requirements for finished woven glass fiber fabrics. Appendix II of this specification provides 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 Annex B also categorize fabrics by their current availability status.

General Information

• Status: Replaced
• Publication Date: 22-Sep-2011
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 31.180 - Printed circuits and boards
• Technical Committee: TC 91 - Electronics assembly technology
• Drafting Committee: WG 4 - TC 91/WG 4
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 14-Jun-2023

Relations

• Replaced By: IEC 61249-6-3:2023 - Materials for printed boards and other interconnecting structures – Part 6-3: Sectional specification set for reinforcement materials - Specification for finished fabric woven from “E” glass for printed boards
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC/PAS 61249-6-3 ®
Edition 1.0 2011-09
PUBLICLY AVAILABLE
SPECIFICATION
Specification for finished fabric woven from “E”glass for printed boards

IEC/PAS 61249-6-3:2011(E)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: [e-mail]
Web: www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
 Catalogue of IEC publications: www.iec.ch/searchpub
The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).
It also gives information on projects, withdrawn and replaced publications.
 IEC Just Published: www.iec.ch/online_news/justpub
Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available
on-line and also by email.
 Electropedia: www.electropedia.org
The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions
in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
 Customer Service Centre: www.iec.ch/webstore/custserv
If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service
Centre FAQ or contact us:
Email: [e-mail]
Tel.: [phone]
Fax: [phone]
IEC/PAS 61249-6-3 ®
Edition 1.0 2011-09
PUBLICLY AVAILABLE
SPECIFICATION
Specification for finished fabric woven from “E”glass for printed boards

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
T
ICS 31.180 ISBN 978-2-88912-699-6

– 2 – PAS 61249-6-3 © IEC:2011(E)
CONTENTS
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 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
4.3.7 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 Statistical 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 Acceptable 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

PAS 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 (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 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-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

– 4 – PAS 61249-6-3 © IEC:2011(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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 promote
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 (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 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 possible, 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. While 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 to 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 attestation 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 this 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 indirect, 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 the 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 specificati
...