SIST EN 61249-2-35:2009

SLOVENSKI STANDARD
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Materials for printed boards and other interconnecting structures -- Part 2-35: Reinforced
base materials, clad and unclad - Modified epoxide woven E-glass laminate sheets of
defined flammability (vertical burning test), copper-clad for lead-free assembly
Matériaux pour circuits imprimés et autres structures d'interconnexion -- Partie 2-35:
Matériaux de base renforcés, plaqués et non plaqués - Feuilles stratifiées en tissu de
verre de type E époxyde modifié, plaquées cuivre, d'inflammabilité définie (essai de
combustion verticale) pour les assemblages sans plomb
Ta slovenski standard je istoveten z: EN 61249-2-35:2009
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 61249-2-35
NORME EUROPÉENNE
March 2009
EUROPÄISCHE NORM
ICS 31.180
English version
Materials for printed boards and other interconnecting structures -
Part 2-35: Reinforced base materials, clad and unclad -
Modified epoxide woven E-glass laminate sheets of defined flammability
(vertical burning test), copper-clad for lead-free assembly
(IEC 61249-2-35:2008)
Matériaux pour circuits imprimés  Materialien für Leiterplatten
et autres structures d'interconnexion - und andere Verbindungsstrukturen -
Partie 2-35: Matériaux de base renforcés, Teil 2-35: Kaschierte und unkaschierte
plaqués et non plaqués - verstärkte Basismaterialien -
Feuilles stratifiées en tissu de verre Kupferkaschierte mit E-Glasgewebe
de type E époxyde modifié, verstärkte Laminattafeln auf der Basis
plaquées cuivre, d'inflammabilité définie von modifiziertem Epoxidharz
(essai de combustion verticale) mit definierter Brennbarkeit
pour les assemblages sans plomb (Brennprüfung mit vertikaler Prüflingslage)
(CEI 61249-2-35:2008) für bleifreie Bestückungstechnik
(IEC 61249-2-35:2008)
This European Standard was approved by CENELEC on 2009-02-01. 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 61249-2-35:2009 E
Foreword
The text of document 91/810/FDIS, future edition 1 of IEC 61249-2-35, prepared by IEC TC 91,
Electronics assembly technology, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 61249-2-35 on 2009-02-01.
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) 2009-11-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-02-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61249-2-35:2008 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60194 NOTE  Harmonized as EN 60194:2006 (not modified).
__________
– 3 – EN 61249-2-35:2009
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
IEC 61249-5-1 1995 Materials for interconnection structures - EN 61249-5-1 1996
Part 5: Sectional specification set for
conductive foils and films with and without
coatings -
Section 1: Copper foils (for the manufacture of
copper-clad base materials)
1) 2)
ISO 9000 - Quality management systems - EN ISO 9000 2005
Fundamentals and vocabulary
1)
ISO 11014-1 - Safety data sheet for chemical products - - -
Part 1: Content and order of sections

1) 2)
ISO 14001 - Environmental management systems - EN ISO 14001 2004
Requirements with guidance for use

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

IEC 61249-2-35
Edition 1.0 2008-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Materials for printed boards and other interconnecting structures –
Part 2-35: Reinforced base materials, clad and unclad – Modified epoxide woven
E-glass laminate sheets of defined flammability (vertical burning test), copper-
clad for lead-free assembly
Matériaux pour circuits imprimés et autres structures d'interconnexion –
Partie 2-35: Matériaux de base renforcés, plaqués et non plaqués – Feuilles
stratifiées en tissu de verre de type E époxyde modifié, plaquées cuivre,
d’inflammabilité définie (essai de combustion verticale) pour les assemblages
sans plomb
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
T
CODE PRIX
ICS 31.180 ISBN 2-8318-1018-2
– 2 – 61249-2-35 © IEC:2008
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references.6
3 Materials and construction .6
3.1 Resin system.6
3.2 Metal foil .7
3.3 Reinforcement .7
4 Internal marking.7
5 Electrical properties .7
6 Non-electrical properties of the copper-clad laminate .7
6.1 Appearance of the copper-clad sheet .7
6.1.1 Indentations (pits and dents) .8
6.1.2 Wrinkles .8
6.1.3 Scratches .8
6.1.4 Raised areas .8
6.1.5 Surface waviness.9
6.2 Appearance of the unclad face.9
6.3 Laminate thickness.9
6.4 Bow and twist .9
6.5 Properties related to the copper foil bond.10
6.6 Punching and machining.11
6.7 Dimensional stability.11
6.8 Sheet sizes.11
6.8.1 Typical sheet sizes .11
6.8.2 Tolerances for sheet sizes .12
6.9 Cut panels .12
6.9.1 Cut panel sizes .12
6.9.2 Size tolerances for cut panels .12
6.9.3 Rectangularity of cut panels .12
7 Non-electrical properties of the base material after complete removal of the copper
foil.12
7.1 Appearance of the dielectric base material.12
7.2 Flexural strength.13
7.3 Flammability .13
7.4 Water absorption .14
7.5 Measling.14
7.6 Glass transition temperature and cure factor.15
7.7 Decomposition temperature .15
7.8 Thermal resistance .15
7.9 Z-axis expansion .15
8 Quality assurance .16
8.1 Quality system .16
8.2 Responsibility for inspection.16
8.3 Qualification inspection.16
8.4 Quality conformance inspection .16
8.5 Certificate of conformance.16

61249-2-35 © IEC:2008 – 3 –
8.6 Safety data sheet.17
9 Packaging and marking.17
10 Ordering information .17
Annex A (informative) Engineering information .18
Annex B (informative) Common laminate constructions.20
Annex C (informative) Guideline for qualification and conformance inspection.22
Bibliography .23

Table 1 – Electrical properties .7
Table 2 – Nominal thickness and tolerance of metal-clad laminate.9
Table 3 – Bow and twist .10
Table 4 – Pull-off and peel strength .10
Table 5 – Dimensional stability .11
Table 6 – Size tolerances for cut panels .12
Table 7 – Rectangularity of cut panels .12
Table 8 – Flexural strength.13
Table 9 – Flammability .14
Table 10 – Water absorption .14
Table 11 – Measling.15
Table 12 – Glass transition temperature and cure factor .15
Table 13 – Decomposition temperature .15
Table 14 – Thermal resistance .15
Table 15 – Z-axis expansion.16

– 4 – 61249-2-35 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MATERIALS FOR PRINTED BOARDS
AND OTHER INTERCONNECTING STRUCTURES –

Part 2-35: Reinforced base materials, clad and unclad –
Modified epoxide woven E-glass laminate sheets
of defined flammability (vertical burning test),
copper-clad 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 61249-2-35 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
91/810/FDIS 91/832/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.

61249-2-35 © IEC:2008 – 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.
– 6 – 61249-2-35 © IEC:2008
MATERIALS FOR PRINTED BOARDS
AND OTHER INTERCONNECTING STRUCTURES –

Part 2-35: Reinforced base materials, clad and unclad –
Modified epoxide woven E-glass laminate sheets
of defined flammability (vertical burning test),
copper-clad for lead-free assembly

1 Scope
This part of IEC 61249 gives requirements for properties of modified brominated epoxide
woven E-glass laminate sheet 0,05 mm up to 3,2 mm, of defined flammability (vertical burning
test), copper-clad. The glass transition temperature is defined to be 150 °C to 200 °C.
Its flame resistance is defined in terms of the flammability requirements of 7.3.
Some property requirements may have several classes of performance. The class desired
should be specified on the purchase order; otherwise, the default class of material will be
supplied.
2 Normative references
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.
IEC 61189-2:2006, Test methods for electrical materials, printed boards and other
interconnection structures and assemblies – Part 2: Test method for interconnection structures
IEC 61249-5-1:1995, Materials for interconnection structures – Part 5: Sectional specification
set for conductive foils and films with and without coatings – Section 1: Copper foils (for the
manufacture of copper-clad base materials)
ISO 9000, Quality management systems – Fundamentals and vocabulary
ISO 11014-1, Safety data sheet for chemical products – Part 1: Content and order of sections
ISO 14001, Environmental management systems – Requirements with guidance for use
3 Materials and construction
The sheet consists of an insulating base with metal-foil bonded to one side or both.
3.1 Resin system
Majority di-functional epoxide, modified epoxide, woven E-glass laminate with a glass transition
temperature of 150 °C to 200 °C. The flammability rating is achieved through the use of
bromine reacted into the polymer. Inorganic fillers may be used. Contrast agents may be added
to enhance processing such as automated optical inspection (AOI).
Its flame resistance is defined in terms of the flammability requirements of 7.3.

61249-2-35 © IEC:2008 – 7 –
3.2 Metal foil
Copper as specified in IEC 61249-5-1, copper foil (for the manufacture of copper-clad
materials). The preferred foils are electro-deposited of defined ductility.
3.3 Reinforcement
Woven E-glass as specified in the future IEC 61249-6-3, woven E-glass fabric (for the
manufacture of prepreg and copper clad materials).
4 Internal marking
Not specified.
5 Electrical properties
The electrical property requirements are shown in Table 1.
Table 1 – Electrical properties
Test method
Property Requirements
(IEC 61189-2)
Resistance of foil 2E12 As specified in IEC 61249-5-1
Surface resistance after damp heat
while in the humidity chamber 2E03 ≥10 000 MΩ
(optional)
Surface resistance after damp heat
2E03 ≥50 000 MΩ
and recovery
Volume resistivity after damp heat
while in the humidity chamber 2E04 ≥5 000 MΩm
(optional)
Volume resistivity after damp heat and
2E04
≥10 000 MΩm
recovery
Relative permittivity after damp heat
2E10 ≤5,4
and recovery (1 MHz)
Dissipation factor after damp heat and
2E10 ≤0,035
recovery (1 MHz)
Electric strength (only for material
2E11 ≥30 kV/mm
...