EN 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(E) 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.

Materialien für Leiterplatten und andere Verbindungsstrukturen – Teil 4-14: Rahmenspezifikationen für unkaschierte Prepreg-Materialien (zur Herstellung von Mehrlagenleiterplatten) – Mit E-Glasgewebe verstärkte Epoxidharz-Prepregs mit definierter Brennbarkeit (Brennprüfung mit vertikaler Prüflingslage) für bleifreie Bestückungstechnik

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.

Materiali za tiskane plošče in druge povezovalne strukture - 4-14. del: Posamezne zahteve za prepreg materiale brez bakrene folije (za izdelavo večplastnih plošč) - S stekleno tkanino ojačen prepreg definirane gorljivosti (navpični preskus gorljivosti), obdelan z epoksidno smolo, za montažo brez svinca (IEC 61249-4-14:2009)

Ta del IEC 61249 podaja zahteve za lastnosti preprega, ki so v glavnem namenjene temu, da se uporabljajo kot vezne plošče v povezavi z laminati, v skladu z IEC 61249-2-36, pri proizvodnji večplastnih plošč v skladu z IEC 62326-4. Večplastne plošče, ki jih tvorijo ti materiali, so primerne za postopke montaže brez svinca. Ta material se lahko uporablja tudi za vezavo drugih tipov laminatov. Prepreg je v skladu s tem standardom opredeljene gorljivosti (navpični preizkus gorljivosti). Ocena gorljivosti na popolnoma vulkaniziranem prepregu se doseže z uporabo bromiranih zaščitnih sredstev proti požaru, ki so vsebovana kot sestavni del polimerne strukture. Po vulkanizaciji preprega v skladu z navodili dobavitelja je točka posteklenitve opredeljena pri najmanj 120°C. 2 Normativna referenca.

General Information

• Status: Published
• Publication Date: 29-Jun-2009
• Withdrawal Date: 31-May-2012
• ICS: 31.180 - Printed circuits and boards
• Technical Committee: CLC/SR 91 - Electronics assembly technology
• Drafting Committee: IEC/TC 91 - IEC_TC_91
• Parallel Committee: IEC/TC 91 - IEC_TC_91
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 30-Jun-2009
• Completion Date: 30-Jun-2009
• Ref Project: SIST EN 61249-4-14:2010 - 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

Overview

EN 61249-4-14:2009 (identical to IEC 61249-4-14:2009) is a sectional specification for unclad epoxide woven E‑glass prepreg with a defined flammability rating intended for the manufacture of multilayer printed circuit boards (PCBs) suitable for lead‑free assembly. The standard specifies required material properties, delivery forms and quality assurance expectations for prepreg used primarily as bonding sheets with laminates defined in IEC 61249‑2‑36 and for multilayer board manufacture in accordance with IEC 62326‑4.

Key topics and technical requirements

The standard covers material and performance characteristics relevant to PCB production, including:

• Reinforcement and resin system: Epoxide resin reinforced with woven E‑glass.
• Flammability: Defined vertical burning test rating for fully cured prepreg; achieved using brominated fire retardants integrated into the polymeric structure.
• Thermal performance: Minimum glass transition temperature (Tg) of 120 °C after supplier‑recommended cure; decomposition temperature and thermal resistance requirements are specified.
• Electrical properties: Electric strength, relative permittivity and dissipation factor after curing.
• Processing / B‑stage properties: Resin content, treated weight, resin flow, melting viscosity, gel time and volatile content - all important for lamination and reflow compatibility with lead‑free processes.
• Dimensional and mechanical: Cured thickness, Z‑axis expansion, edge and surface appearance (dewetted areas, creases, broken filaments).
• Delivery, QA and handling: Forms (rolls, sheets, cut panels), packaging, shelf life, qualification and conformance inspection, certificate of conformance and safety data sheet.

Applications and who uses it

EN 61249‑4‑14 is primarily used by:

• PCB manufacturers producing rigid multilayer boards for lead‑free assembly.
• Material suppliers and prepreg manufacturers developing and certifying epoxide E‑glass prepregs.
• Electronics assemblers and process engineers specifying materials compatible with lead‑free soldering profiles.
• Procurement, quality and compliance teams validating supplier data sheets and certificates.
• Test laboratories performing electrical, thermal and flammability verification per the referenced test methods.

Practical benefits include predictable lamination behavior, defined flammability performance for safety assessments, and thermal compatibility with lead‑free reflow processes.

Related standards

• IEC 61249‑2‑36 / EN 61249‑2‑36 – epoxide woven E‑glass laminate sheets (clad) for lead‑free assembly
• IEC 62326‑4 / EN 62326‑4 – sectional specification for rigid multilayer printed boards
• IEC 61189‑2 – test methods for materials for interconnection structures
• ISO 11014‑1 – safety data sheet content and order

Keywords: EN 61249‑4‑14, IEC 61249‑4‑14, prepreg, epoxide woven E‑glass, lead‑free assembly, vertical burning test, flammability, Tg 120 °C, multilayer boards.

Standards Content (Sample)

SLOVENSKI STANDARD
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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
Ta slovenski standard je istoveten z: EN 61249-4-14:2009
ICS:
31.180 7LVNDQDYH]MD7,9LQWLVNDQH Printed circuits and boards
SORãþH
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 61249-4-14
NORME EUROPÉENNE
June 2009
EUROPÄISCHE NORM
ICS 31.180
English version
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)
Matériaux pour circuits imprimés  Materialien für Leiterplatten
et autres structures d'interconnexion - und andere Verbindungsstrukturen -
Partie 4-14: Série de spécifications Teil 4-14: Rahmenspezifikationen
intermédiaires pour matériaux préimprégnés, für unkaschierte Prepreg-Materialien
non plaqués (pour la fabrication des cartes (zur Herstellung von Mehrlagenleiterplatten) -
multicouches) - Mit E-Glasgewebe verstärkte Epoxidharz-
Tissu de verre époxyde préimprégné Prepregs mit definierter Brennbarkeit
de type E d'inflammabilité définie (Brennprüfung mit vertikaler Prüflingslage)
(essai de combustion verticale) für bleifreie Bestückungstechnik
destiné aux assemblages sans plomb (IEC 61249-4-14:2009)
(CEI 61249-4-14:2009)
This European Standard was approved by CENELEC on 2009-06-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations 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 European Standard exists 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 electrotechnical 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, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: Avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61249-4-14:2009 E
Foreword
The text of document 91/850/FDIS, future edition 1 of IEC 61249-4-14, prepared by IEC TC 91,
Electronics assembly technology, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 61249-4-14 on 2009-06-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2010-03-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-06-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61249-4-14:2009 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60194 NOTE  Harmonized as EN 60194:2006 (not modified).
IEC 61249-2-7 NOTE  Harmonized as EN 61249-2-7:2002 (not modified).
IEC 61249-2-8 NOTE  Harmonized as EN 61249-2-8:2003 (not modified).
ISO 9000 NOTE  Harmonized as EN ISO 9000:2005 (not modified).
__________
- 3 - EN 61249-4-14:2009
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents 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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 61189-2 2006 Test methods for electrical materials, printed EN 61189-2 2006
boards and other interconnection structures
and assemblies -
Part 2: Test methods for materials for
interconnection structures
1) 2)
IEC 61249-2-36 - Materials for printed boards and other EN 61249-2-36 2009
interconnecting structures -
Part 2-36: Reinforced base materials, clad
and unclad - Epoxide woven E-glass laminate
sheets of defined flammability (vertical burning
test), copper-clad for lead-free assembly

1) 2)
IEC 62326-4 - Printed boards - EN 62326-4 1997
Part 4: Rigid multilayer printed boards with
interlayer connections - Sectional specification

ISO 11014-1 1994 Safety data sheet for chemical products - - -
Part 1: Content and order of sections

1)
Undated reference.
2)
Valid edition at date of issue.

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 2-8318-1043-3
– 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
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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 d
...