IEC 61249-4-14:2009

Materials for printed boards and other interconnecting structures - Part 4-14: Sectional specification set for prepreg materials, unclad (for the manufacture of multilayer boards) - Epoxide woven E-glass prepreg of defined flammability (vertical burning test) for lead-free assembly

IEC 61249-4-14:2009 gives requirements for properties of prepreg that are mainly intended to be used as bonding sheets in connection with laminates according to IEC 61249-2-36 when manufacturing multilayer boards according to IEC 62326-4. Multilayer boards comprised of these materials are suitable for lead-free assembly processes. This material may also be 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 through the use of brominated fire retardants contained as an integral part of the polymeric structure. After curing of the prepreg according to the supplier's instructions, the glass transition temperature is defined to be 120 °C minimum.

Matériaux pour circuits imprimés et autres structures d'interconnexion - Partie 4-14: Série de spécifications intermédiaires pour matériaux préimprégnés, non plaqués (pour la fabrication des cartes multicouches) - Tissu de verre époxyde préimprégné de type E d'inflammabilité définie (essai de combustion verticale) destiné aux assemblages sans plomb

La CEI 61249-4-14:2009 fournit des exigences concernant les propriétés des préimprégnés principalement prévus pour être utilisés en tant que feuilles de collage en relation avec des stratifiés selon la CEI 61249-2-36 durant la fabrication des cartes multicouches selon la CEI 62326-4. Les cartes multicouches constituées de ces matériaux conviennent pour des processus d'assemblage sans plomb. Ce matériau peut également être utilisé pour coller d'autres types de stratifiés. Un préimprégné, selon la présente norme, est d'une inflammabilité définie (essai de combustion verticale). L'inflammabilité nominale d'un préimprégné entièrement traité est obtenue en utilisant des retardateurs de flamme bromés faisant partie intégrante de la structure polymère. Après traitement du préimprégné selon les instructions du fabricant, la température de transition vitreuse est définie comme étant au minimum de 120 °C.

General Information

• Status: Published
• Publication Date: 25-May-2009
• 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: PPUB - Publication issued
• Start Date: 15-Jun-2009
• Completion Date: 26-May-2009

Standards Content (Sample)

IEC 61249-4-14 ®
Edition 1.0 2009-05
INTERNATIONAL
STANDARD
Materials for printed boards and other interconnecting structures –
Part 4-14: Sectional specification set for prepreg materials, unclad (for the
manufacture of multilayer boards) – Epoxide woven E-glass prepreg of defined
flammability (vertical burning test) for lead-free assembly

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
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CH-1211 Geneva 20
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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
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IEC 61249-4-14 ®
Edition 1.0 2009-05
INTERNATIONAL
STANDARD
Materials for printed boards and other interconnecting structures –
Part 4-14: Sectional specification set for prepreg materials, unclad (for the
manufacture of multilayer boards) – Epoxide woven E-glass prepreg of defined
flammability (vertical burning test) for lead-free assembly

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
N
ICS 31.180 ISBN 978-2-88910-464-2
– 2 – 61249-4-14 © IEC:2009(E)
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references .6
3 Materials and construction.6
3.1 Reinforcement.6
3.2 Resin system.7
4 Properties.7
4.1 Properties related to the appearance of the prepreg .7
4.1.1 Dewetted areas (fish eyes) .7
4.1.2 Broken filaments.7
4.1.3 Distortion.7
4.1.4 Creases.7
4.1.5 Edge conditions.7
4.2 Properties related to B-stage prepreg.7
4.2.1 Resin content .8
4.2.2 Treated weight.8
4.2.3 Resin flow .8
4.2.4 Scaled flow thickness .8
4.2.5 Melting viscosity .8
4.2.6 Gel time.9
4.2.7 Volatile content.9
4.3 Properties related to prepreg after curing .9
4.3.1 Electric strength .9
4.3.2 Flammability .9
4.3.3 Relative permittivity and dissipation factor .10
4.3.4 Cured thickness.10
4.3.5 Glass transition temperature (Tg) .10
4.3.6 Decomposition temperature (Td).10
4.3.7 Thermal resistance .11
4.3.8 Z-axis expansion .11
5 Delivery form .11
5.1 Rolls.11
5.2 Sheets.11
5.3 Cut panels.11
6 Quality assurance.12
6.1 Quality system.12
6.2 Responsibility for inspection .12
6.3 Qualification inspection .12
6.4 Quality conformance inspection.12
6.5 Certificate of conformance.12
6.6 Safety data sheet .12
7 Packaging and marking .12
8 Shelf life.13
9 Ordering information.13
Bibliography.14

61249-4-14 © IEC:2009(E) – 3 –

Table 1 – Flammability, vertical burning test .10
Table 2 – Decomposition temperature requirements .10
Table 3 – Thermal resistance requirements .11
Table 4 – Z-axis expansion requirements.11

– 4 – 61249-4-14 © IEC:2009(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
MATERIALS FOR PRINTED BOARDS AND
OTHER INTERCONNECTING STRUCTURES –

Part 4-14: Sectional specification set for prepreg materials, unclad
(for the manufacture of multilayer boards) –
Epoxide woven E-glass prepreg of defined flammability
(vertical burning test) for lead-free assembly

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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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.
International Standard IEC 61249-4-14 has been prepared by IEC technical committee 91:
Electronics assembly technology.
The text of this standard is based on the following documents:
FDIS Report on voting
91/850/FDIS 91/862/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

61249-4-14 © IEC:2009(E) – 5 –
A list of all parts of the IEC 61249 series, under the general title Materials for printed boards
and other interconnecting structures, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

– 6 – 61249-4-14 © IEC:2009(E)
MATERIALS FOR PRINTED BOARDS AND
OTHER INTERCONNECTING STRUCTURES –

Part 4-14: Sectional specification set for prepreg materials, unclad
(for the manufacture of multilayer boards) –
Epoxide woven E-glass prepreg of defined flammability
(vertical burning test) for lead-free assembly

1 Scope
This part of IEC 61249 gives requirements for properties of prepreg that are mainly intended
to be used as bonding sheets in connection with laminates according to IEC 61249-2-36 when
manufacturing multilayer boards according to IEC 62326-4. Multilayer boards comprised of
these materials are suitable for lead-free assembly processes. This material may also be 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 through the
...

IEC 61249-4-14 ®
Edition 1.0 2009-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Materials for printed boards and other interconnecting structures –
Part 4-14: Sectional specification set for prepreg materials, unclad (for the
manufacture of multilayer boards) – Epoxide woven E-glass prepreg of defined
flammability (vertical burning test) for lead-free assembly

Matériaux pour circuits imprimés et autres structures d'interconnexion –
Partie 4-14: Série de spécifications intermédiaires pour matériaux préimprégnés,
non plaqués (pour la fabrication des cartes multicouches) – Tissu de verre
époxyde préimprégné de type E d'inflammabilité définie (essai de combustion
verticale) destiné aux assemblages sans plomb

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.

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publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office
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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.
ƒ 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.
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on-line and also by email.
ƒ 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.
ƒ 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:
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IEC 61249-4-14 ®
Edition 1.0 2009-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Materials for printed boards and other interconnecting structures –
Part 4-14: Sectional specification set for prepreg materials, unclad (for the
manufacture of multilayer boards) – Epoxide woven E-glass prepreg of defined
flammability (vertical burning test) for lead-free assembly

Matériaux pour circuits imprimés et autres structures d'interconnexion –
Partie 4-14: Série de spécifications intermédiaires pour matériaux préimprégnés,
non plaqués (pour la fabrication des cartes multicouches) – Tissu de verre
époxyde préimprégné de type E d'inflammabilité définie (essai de combustion
verticale) destiné aux assemblages sans plomb

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
N
CODE PRIX
ICS 31.180 ISBN 978-2-88910-465-9
– 2 – 61249-4-14 © IEC:2009
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references .6
3 Materials and construction.6
3.1 Reinforcement.6
3.2 Resin system.7
4 Properties.7
4.1 Properties related to the appearance of the prepreg .7
4.1.1 Dewetted areas (fish eyes) .7
4.1.2 Broken filaments.7
4.1.3 Distortion.7
4.1.4 Creases.7
4.1.5 Edge conditions.7
4.2 Properties related to B-stage prepreg.7
4.2.1 Resin content .8
4.2.2 Treated weight.8
4.2.3 Resin flow .8
4.2.4 Scaled flow thickness .8
4.2.5 Melting viscosity .8
4.2.6 Gel time.9
4.2.7 Volatile content.9
4.3 Properties related to prepreg after curing .9
4.3.1 Electric strength .9
4.3.2 Flammability .9
4.3.3 Relative permittivity and dissipation factor .10
4.3.4 Cured thickness.10
4.3.5 Glass transition temperature (Tg) .10
4.3.6 Decomposition temperature (Td).10
4.3.7 Thermal resistance .11
4.3.8 Z-axis expansion .11
5 Delivery form .11
5.1 Rolls.11
5.2 Sheets.11
5.3 Cut panels.11
6 Quality assurance.12
6.1 Quality system.12
6.2 Responsibility for inspection .12
6.3 Qualification inspection .12
6.4 Quality conformance inspection.12
6.5 Certificate of conformance.12
6.6 Safety data sheet .12
7 Packaging and marking .12
8 Shelf life.13
9 Ordering information.13
Bibliography.14

61249-4-14 © IEC:2009 – 3 –
Table 1 – Flammability, vertical burning test .10
Table 2 – Decomposition temperature requirements .10
Table 3 – Thermal resistance requirements .11
Table 4 – Z-axis expansion requirements.11

– 4 – 61249-4-14 © IEC:2009
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
MATERIALS FOR PRINTED BOARDS AND
OTHER INTERCONNECTING STRUCTURES –

Part 4-14: Sectional specification set for prepreg materials, unclad
(for the manufacture of multilayer boards) –
Epoxide woven E-glass prepreg of defined flammability
(vertical burning test) for lead-free assembly

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
...