SIST EN 61249-2-8:2003

SLOVENSKI SIST EN 61249-2-8:2003

STANDARD
november 2003
Materials for printed boards and other interconnecting structures - Part 2-8:
Reinforced base materials clad and unclad - Modified brominated epoxide woven
fibreglass reinforced laminated sheets of defined flammability (vertical burning test),
copper-clad (IEC 61249-2-8:2003)
ICS 31.180 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 61249-2-8
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2003
ICS 31.180
English version
Materials for printed boards and other interconnecting structures
Part 2-8: Reinforced base materials clad and unclad –
Modified brominated epoxide woven fibreglass
reinforced laminated sheets of defined flammability
(vertical burning test), copper-clad
(IEC 61249-2-8:2003)
Matériaux pour circuits imprimés  Materialien für Leiterplatten und
et autres structures d'interconnexion andere Verbindungsstrukturen
Partie 2-8: Matériaux de base renforcés, Teil 2-8: Kaschierte und unkaschierte
plaqués et non plaqués – verstärkte Basismaterialien -
Feuilles stratifiées renforcées Kupferkaschierte mit Glasgewebe
en tissu de fibres de verre époxyde bromé verstärkte Laminattafeln
modifié, d'inflammabilité définie auf der Basis von bromhaltigem
(essai de combustion verticale), modifiziertem Epoxidharz definierter
plaquées cuivre Brennbarkeit
(CEI 61249-2-8:2003) (Brennprüfung mit vertikaler Prüflingslage)
(IEC 61249-2-8:2003)
This European Standard was approved by CENELEC on 2003-04-01. 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, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

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

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61249-2-8:2003 E
Foreword
The text of document 91/359/FDIS, future edition 1 of IEC 61249-2-8, prepared by IEC TC 91,
Electronics assembly technology, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 61249-2-8 on 2003-04-01.
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) 2004-01-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2006-04-01

Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annex ZA is normative and annexes A, B and C are informative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61249-2-8:2003 was approved by CENELEC as a
European Standard without any modification.
__________
- 3 - EN 61249-2-8:2003
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
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 1997 Test methods for electrical materials, EN 61189-2 1997
printed boards and other + corr. August 1997
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 or without
coatings –
Section 1: Copper foils (for the
manufacture of copper-clad base
materials)
ISO 9000 2000 Quality management systems EN ISO 9000 2000
Fundamentals and vocabulary
ISO 11014-1 1994 Safety data sheet for chemical products- -
Part 1: Content and order of sections

ISO 14001 1996 Environmental management systems EN ISO 14001 1996
Specification with guidance for use

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Matériaux pour circuits imprimés
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Partie 2-8:
Matériaux de base renforcés, plaqués et non
plaqués – Feuilles stratifiées renforcées en tissu
de fibres de verre époxyde bromé modifié,
d'inflammabilité définie (essai de combustion
verticale), plaquées cuivre
Materials for printed boards and other
interconnecting structures –
Part 2-8:
Reinforced base materials clad and unclad –
Modified brominated epoxide woven fibreglass
reinforced laminated sheets of defined
flammability (vertical burning test), copper-clad
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utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
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Pour prix, voir catalogue en vigueur
For price, see current catalogue

61249-2-8 © IEC:2003 – 3 –
CONTENTS
FOREWORD . 7
1 Scope .11
2 Normative references.11
3 Materials and construction.11
3.1 Resin system .11
3.2 Reinforcement .13
3.3 Metal foil.13
4 Internal marking .13
5 Electrical properties .13
6 Non-electrical properties of the copper-clad laminate.15
6.1 Appearance of the copper-clad sheet .15
6.2 Appearance of the unclad face .17
6.3 Laminate thickness .17
6.4 Bow and twist.19
6.5 Properties related to the copper foil bond .21
6.6 Punching and machining .21
6.7 Dimensional stability .21
6.8 Sheet sizes .23
6.9 Cut panels .23
7 Non-electrical properties of the base material after complete removal of the copper foil .25
7.1 Appearance of the dielectric base material .25
7.2 Flexural strength.27
7.3 Flammability .27
7.4 Water absorption .29
7.5 Measling .29
7.6 Glass transition temperature and cure factor .29
8 Quality assurance .31
8.1 Quality system .31
8.2 Responsibility for inspection.31
8.3 Qualification inspection .31
8.4 Quality conformance inspection.31
8.5 Certificate of conformance .31
8.6 Safety data sheet .31
9 Packaging and marking.33
10 Ordering information .33
Annex A (informative) Engineering information.35
Annex B (informative) Common laminate constructions.39
Annex C (informative) Guideline for qualification and conformance inspection.43
Bibliography .45

61249-2-8 © IEC:2003 – 5 –
Table 1 – Electrical properties .13
Table 2 – Nominal thickness and tolerance of metal-clad laminate .19
Table 3 – Bow and twist.19
Table 4 – Pull-off and peel strength .21
Table 5 – Dimensional stability .23
Table 6 – Size tolerance for cut panels .25
Table 7 – Rectangularity of cut panels .25
Table 8 – Flexural strength .27
Table 9 – Flammability .27
Table 10 – Water absorption.29
Table 11 – Measling .29
Table 12 – Glass transition temperature and cure factor .29

61249-2-8 © IEC:2003 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MATERIALS FOR PRINTED BOARDS
AND OTHER INTERCONNECTING STRUCTURES –
Part 2-8: Reinforced base materials clad and unclad –
Modified brominated epoxide woven fibreglass reinforced laminated
sheets of defined flammability (vertical burning test), copper-clad
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61249-2-8 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
91/359/FDIS 91/372/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.
IEC 61249-2 consists of the following parts, under the general title Materials for printed boards
and other interconnecting structures – Part 2: Reinforced base materials, clad and unclad
Part 2-1: Phenolic cellulose paper laminate, economic grade
Part 2-2: Phenolic cellulose paper reinforced laminated sheets, high electrical grade,
copper-clad
61249-2-8 © IEC:2003 – 9 –
Part 2-4: Polyester non-woven/woven fibreglass laminated sheet of defined flammability
(vertical burning test), copper-clad
Part 2-5: Brominated epoxide cellulose paper reinforced core/woven E-glass reinforced
surfaces laminate sheets of defined flammability (vertical burning test), copper-clad
Part 2-6: Brominated epoxide non-woven/woven E-glass reinforced laminated sheets of
defined flammability (vertical burning test), copper-clad
Part 2-7: Epoxide woven E-glass laminated sheet of defined flammability (vertical burning
test), copper-clad
Part 2-8: Modified brominated epoxide woven fibreglass reinforced laminated sheets of
defined flammability (vertical burning test), copper clad
Part 2-9: Bismaleimide/triazine, modified epoxide or unmodified, woven E-glass reinforced
laminated sheets of defined flammability (vertical burning test), copper-clad
Part 2-10: Cyanate ester, brominated epoxide, modified or unmodified, woven E-glass
reinforced laminated sheets of defined flammability (vertical burning test), copper-
clad
Part 2-11: Polyimide, brominated epoxide modified or unmodified, woven E-glass reinforced
laminated sheets of defined flammability (vertical burning test), copper-clad
Part 2-12: Epoxide non-woven aramid laminate of defined flammability, copper-clad
Part 2-13: Cyanate ester non-woven aramid laminate of defined flammability, copper-clad
Part 2-18: Polyester non-woven fibreglass reinforced laminated sheet of defined flammability
(vertical burning test), copper-clad
Part 2-19: Epoxide cross-plied linear fibreglass-reinforced laminated sheets of defined
flammability (vertical burning test), copper-clad
Part 2-21: Non-halogenated epoxide woven E-glass reinforced laminated sheets of defined
flammability (vertical burning test), copper-clad
Part 2-22: Modified non-halogenated epoxide woven E-glass laminated sheet of defined
flammablity (vertical burning test), copper-clad
Part 2-23: Non-brominated phenolic, cellulose paper sheet of defined flammability, economic
grade, copper clad
Part 2-26: Non-brominated epoxide, nonwoven/woven glass fabric sheet of defined
flammability, copper-clad
The committee has decided that the contents of this publication will remain unchanged until
2004. At this date, the publication will be
 reconfirmed;
 withdrawn;
 replaced by a revised edition, or
 amended.
___________
Under consideration.
61249-2-8 © IEC:2003 – 11 –
MATERIALS FOR PRINTED BOARDS
AND OTHER INTERCONNECTING STRUCTURES –
Part 2-8: Reinforced base materials clad and unclad –
Modified brominated epoxide woven fibreglass reinforced laminated
sheets of defined flammability (vertical burning test), copper-clad
1 Scope
This part of IEC 61249 gives requirements for properties of modified brominated epoxide
woven E-glass reinforced laminate sheets of defined flammability (vertical burning test),
copper-clad in thicknesses of 0,05 mm up to 3,2 mm. The flammability rating is acheived
through the use of brominated fire retardants reacted as part of the epoxide polymeric
structure. The glass transition temperature is defined as being between 150 °C and 190 °C.
Some property requirements may have several classes of performance. The class desired
needs to be specified on the purchase order, otherwise the default class of material may 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 61189-2:1997, Test methods for electrical materials, interconnection structures and
assemblies – Part 2: Test methods for materials 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 9000:2000, Quality management systems – Fundamentals and vocabulary
ISO 11014-1:1994, Safety data sheet for chemical products – Part 1: Content and order of
sections
ISO 14001:1996, Environmental management systems – Specification 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
Brominated epoxide modified with multifunctional epoxide resulting in a laminate with a glass
transition temperature of between 150 °C and 190 °C. 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.

61249-2-8 © IEC:2003 – 13 –
3.2 Reinforcement
Woven E-glass as specified in IEC 61249-6-3, woven E-glass fabric (for the manufacture of
prepreg and copper clad materials).
3.3 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.
4 Internal marking
Not specified.
5 Electrical properties
The requirements for the electrical properties are shown in Table 1.
Table 1 – Electrical properties
Test method
Property Requirement
(IEC 61189-2)
Resistance of foil As specified
2E12
in IEC 61249-5-1
Surface resistance after damp heat while in the humidity
2E03
≥10 000 MΩ
chamber (optional)
Surface resistance after damp heat and recovery 2E03
≥50 000 MΩ
Volume resistivity after damp heat while in the humidity
2E04 ≥5 000 MΩm
chamber (optional)
Volume resistivity after damp heat and recovery 2E04 ≥10 000 MΩm
Relative permittivity after damp heat and recovery
2E10 ≤5,4
at 1 MHz
Dissipation factor after damp heat and recovery at 1 MHz
2E10 ≤0,035
Electric strength (only for material thicknesses < 0,5 mm) 2E11
≥30 kV/mm
Arc resistance 2E14 ≥60 s
Dielectric breakdown
2E15 ≥40 kV
(only for material thicknesses ≥ 0,5 mm )
Surface resistance at 125 °C 2E07
≥1 000 MΩ
Volume resistivity at 125 °C 2E07 ≥1 000 MΩm

61249-2-8 © IEC:2003 – 15 –
6 Non-electrical properties of the copper-clad laminate
6.1 Appearance of the copper-clad sheet
The copper-clad face shall
...