SIST EN 61249-2-41:2010

Materials for printed boards and other interconnecting structures - Part 2-41: Reinforced base materials clad and unclad - Brominated epoxide cellulose paper/woven E-glass reinforced laminate sheets of defined flammability (vertical burning test), copper-clad for lead-free assembly (IEC 61249-2-41:2010)

This part of IEC 61249 gives requirements for properties of brominated epoxide cellulose paper reinforced core/woven E-glass reinforced surface laminate sheets of defined flammability (vertical burning test), copper-clad for lead-free assembly in thicknesses of 0,60 mm up to 1,70 mm. The flammability rating is achieved through the use of brominated fire retardants reacted as part of the epoxide polymeric structure. The glass transition temperature is defined to be 100 °C minimum. 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.

Materialien für Leiterplatten und andere Verbindungsstrukturen - Teil 2-41: Kaschierte und unkaschierte verstärkte Basismaterialien - Kupferkaschierte mit Zellulose-Papier und E-Glasgewebe verstärkte Laminattafeln für bleifreie Fertigung auf der Basis von bromhaltigem Epoxidharz mit definierter Brennbarkeit (Brennprüfung mit vertikaler Prüflingslage) (IEC 61249-2-41:2010)

Matériaux pour circuits imprimés et autres structures d'interconnexion - Partie 2-41: Matériaux de base renforcés, plaqués et non plaqués - Feuilles stratifiées renforcées en tissu de verre de type E/papier cellulose époxyde bromé, plaquées cuivre, d'inflammabilité définie (essai de combustion verticale) pour les assemblages sans plomb (CEI 61249-2-41:2010)

La CEI 61249-2-41:2010 fournit des exigences concernant les propriétés des feuilles stratifiées renforcées en tissu de verre de type E/papier cellulose époxyde bromé, plaquées cuivre, d'inflammabilité définie (essai de combustion verticale) pour les assemblages sans plomb et ayant une épaisseur comprise entre 0,60 mm et 1,70 mm. Les caractéristiques d'inflammabilité sont obtenues en faisant réagir des ignifuges bromés dans la structure polymère qui font partie de la structure polymère époxyde. La température de transition vitreuse a été définie comme devant être de 100 °C au minimum.

Materiali za plošče tiskanih vezij in druge povezovalne strukture - 2-41. del: Pokovinjeni in nepokovinjeni ojačeni osnovni materiali - Z bakrom pokovinjeni laminat z določeno gorljivostjo (navpični preskus gorljivosti), ki ima jedro ojačeno z bromiranim epoksidnim celuloznim papirjem in površino s tkanim E-steklom za sestavljanje brez svinca (IEC 61249-2-41:2010)

Ta del IEC 61249 podaja zahteve za lastnosti z bakrom pokovinjenega laminata z določeno gorljivostjo (navpični preskus gorljivosti), ki ima jedro ojačeno z bromiranim epoksidnim celuloznim papirjem in površino s tkanim E-steklom za sestavljanje brez svinca, debeline med 0,60 mm in 1,70 mm. Ocena gorljivosti se doseže z uporabo bromiranih zaščitnih sredstev proti požaru, ki reagirajo kot del epoksidne polimerne strukture. Točka posteklenitve je opredeljena kot vsaj 100 °C. Nekatere zahteve za lastnosti imajo lahko več razredov zmogljivosti. Želeni razred je treba navesti na naročilnici, sicer se dobavi privzeti razred materiala.

General Information

• Status: Published
• Publication Date: 12-Jul-2010
• ICS: 31.180 - Printed circuits and boards
• Technical Committee: ITIV - Electronics assembly technology and Environmental standardization
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 23-Jun-2010
• Due Date: 28-Aug-2010
• Completion Date: 13-Jul-2010
• Ref Project: EN 61249-2-41:2010 - Materials for printed boards and other interconnecting structures - Part 2-41: Reinforced base materials clad and unclad - Brominated epoxide cellulose paper/woven E-glass reinforced laminate sheets of defined flammability (vertical burning test), copper-clad for lead-free assembly

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61249-2-41:2010
01-september-2010
0DWHULDOL]DSORãþHWLVNDQLKYH]LMLQGUXJHSRYH]RYDOQHVWUXNWXUHGHO
3RNRYLQMHQLLQQHSRNRYLQMHQLRMDþHQLRVQRYQLPDWHULDOL=EDNURPSRNRYLQMHQL
ODPLQDW]GRORþHQRJRUOMLYRVWMRQDYSLþQLSUHVNXVJRUOMLYRVWLNLLPDMHGURRMDþHQR
]EURPLUDQLPHSRNVLGQLPFHOXOR]QLPSDSLUMHPLQSRYUãLQRVWNDQLP(VWHNORP]D
VHVWDYOMDQMHEUH]VYLQFD,(&
Materials for printed boards and other interconnecting structures - Part 2-41: Reinforced
base materials clad and unclad - Brominated epoxide cellulose paper/woven E-glass
reinforced laminate sheets of defined flammability (vertical burning test), copper-clad for
lead-free assembly (IEC 61249-2-41:2010)
Materialien für Leiterplatten und andere Verbindungsstrukturen - Teil 2-41: Kaschierte
und unkaschierte verstärkte Basismaterialien - Kupferkaschierte mit Zellulose-Papier und
E-Glasgewebe verstärkte Laminattafeln für bleifreie Fertigung auf der Basis von
bromhaltigem Epoxidharz mit definierter Brennbarkeit (Brennprüfung mit vertikaler
Prüflingslage) (IEC 61249-2-41:2010)
Matériaux pour circuits imprimés et autres structures d'interconnexion - Partie 2-41:
Matériaux de base renforcés, plaqués et non plaqués - Feuilles stratifiées renforcées en
tissu de verre de type E/papier cellulose époxyde bromé, plaquées cuivre,
d'inflammabilité définie (essai de combustion verticale) pour les assemblages sans
plomb (CEI 61249-2-41:2010)
Ta slovenski standard je istoveten z: EN 61249-2-41:2010
ICS:
31.180 7LVNDQDYH]MD7,9LQWLVNDQH Printed circuits and boards
SORãþH
SIST EN 61249-2-41:2010 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61249-2-41:2010

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SIST EN 61249-2-41:2010

EUROPEAN STANDARD
EN 61249-2-41

NORME EUROPÉENNE
May 2010
EUROPÄISCHE NORM

ICS 31.180


English version


Materials for printed boards and other interconnecting structures -
Part 2-41: Reinforced base materials clad and unclad -
Brominated epoxide cellulose paper/woven E-glass reinforced laminate
sheets of defined flammability (vertical burning test),
copper-clad for lead-free assembly
(IEC 61249-2-41:2010)

Matériaux pour circuits imprimés et autres Materialien für Leiterplatten und andere
structures d'interconnexion - Verbindungsstrukturen -
Partie 2-41: Matériaux de base renforcés, Teil 2-41: Kaschierte und unkaschierte
plaqués et non plaqués - verstärkte Basismaterialien -
Feuilles stratifiées renforcées en tissu Kupferkaschierte mit Zellulose-Papier
de verre de type E/papier cellulose und E-Glasgewebe verstärkte
époxyde bromé, plaquées cuivre, Laminattafeln für bleifreie Fertigung
d'inflammabilité définie (essai auf der Basis von bromhaltigem
de combustion verticale) Epoxidharz mit definierter Brennbarkeit
pour les assemblages sans plomb (Brennprüfung mit vertikaler Prüflingslage)
(CEI 61249-2-41:2010) (IEC 61249-2-41:2010)

This European Standard was approved by CENELEC on 2010-05-01. 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, Croatia, 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

Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61249-2-41:2010 E

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SIST EN 61249-2-41:2010
EN 61249-2-41:2010 - 2 -
Foreword
The text of document 91/911/FDIS, future edition 1 of IEC 61249-2-41, prepared by IEC TC 91,
Electronics assembly technology, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 61249-2-41 on 2010-05-01.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2011-02-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2013-05-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61249-2-41:2010 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 60194:2006 NOTE  Harmonized as EN 60194:2006 (not modified).
__________

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SIST EN 61249-2-41:2010
- 3 - EN 61249-2-41:2010
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 - Materials for interconnection structures - EN 61249-5-1 -
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 - Quality management systems - - -
Fundamentals and vocabulary


ISO 11014 - Safety data sheet for chemical products - - -
Content and order of sections


ISO 14001 - Environmental management systems - - -
Requirements with guidance for use

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SIST EN 61249-2-41:2010

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SIST EN 61249-2-41:2010
IEC 61249-2-41
®
Edition 1.0 2010-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Materials for printed boards and other interconnecting structures –
Part 2-41: Reinforced base materials clad and unclad – Brominated epoxide
cellulose paper/woven E-glass reinforced laminate sheets of defined
flammability (vertical burning test), copper-clad for lead-free assembly

Matériaux pour circuits imprimés et autres structures d'interconnexion –
Partie 2-41: Matériaux de base renforcés, plaqués et non plaqués – Feuilles
stratifiées renforcées en tissu de verre de type E/papier cellulose époxyde
bromé, plaquées cuivre, d’inflammabilité définie (essai de combustion verticale)
pour les assemblages sans plomb

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
S
CODE PRIX
ICS 31.180 ISBN 978-2-88910-461-1
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 61249-2-41:2010
– 2 – 61249-2-41 © IEC:2010
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.10
6.7 Dimensional stability.11
6.8 Sheet sizes.11
6.8.1 Typical sheet sizes .11
6.8.2 Tolerances for sheet sizes .11
6.9 Cut panels .11
6.9.1 Cut panel sizes .11
6.9.2 Size tolerances for cut panels .11
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 .13
7.5 Measling.14
7.6 Glass transition temperature and cure factor.14
7.7 Decomposition temperature .14
7.8 Time to delamination (TMA).14
8 Quality assurance .15
8.1 Quality system .15
8.2 Responsibility for inspection.15
8.3 Qualification inspection.15
8.4 Quality conformance inspection .15
8.5 Certificate of conformance.15
8.6 Safety data sheet.16

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SIST EN 61249-2-41:2010
61249-2-41 © IEC:2010 – 3 –
9 Packaging and marking.16
10 Ordering information .16
Annex A (informative) Engineering information .17
Annex B (informative) Common laminate constructions.19
Annex C (informative) Guideline for qualification and conformance inspection.20
Bibliography .21

Table 1 – Electrical properties .7
Table 2 – Nominal thickness and tolerance of metal-clad laminate.9
Table 3 – Bow and twist requirements .9
Table 4 – Pull-off and peel strength requirements .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 requirements.13
Table 9 – Flammability requirements .13
Table 10 – Water absorption requirements .14
Table 11 – Measling requirements.14
Table 12 – Glass transition temperature and cure factor requirements .14
Table 13 – Decomposition temperature requirements .14
Table 14 – Time to delamination (TMA) .15
Table C.1 – Qualification and conformance inspection .20

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SIST EN 61249-2-41:2010
– 4 – 61249-2-41 © IEC:2010
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

MATERIALS FOR PRINTED BOARDS
AND OTHER INTERCONNECTING STRUCTURES –

Part 2-41: Reinforced base materials clad and unclad –
Brominated epoxide cellulose paper/woven E-glass
reinforced 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 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.
International Standard IEC 61249-2-41 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
91/911/FDIS 91/922/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.

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SIST EN 61249-2-41:2010
61249-2-41 © IEC:2010 – 5 –
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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
stability 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.

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SIST EN 61249-2-41:2010
– 6 – 61249-2-41 © IEC:2010
MATERIALS FOR PRINTED BOARDS
AND OTHER INTERCONNECTING STRUCTURES –

Part 2-41: Reinforced base materials clad and unclad –
Brominated epoxide cellulose paper/woven E-glass
reinforced 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 brominated epoxide cellulose paper
reinforced core/woven E-glass reinforced surface laminate sheets of defined flammability
(vertical burning test), copper-clad for lead-free assembly in thicknesses of 0,60 mm up to
1,70 mm. The flammability rating is achieved through the use of brominated fire retardants
reacted as part of the epoxide polymeric structure. The glass transition temperature is defined
to be 100 °C minimum.
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 methods for materials for
interconnection structures
IEC 61249-5-1, 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 14001, Environmental management systems – Requirements with guidance for use
ISO 11014, Safety data sheet for chemical products – Content and order of sections
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, filled or unfilled, resulting in a laminate with a glass transition temperature
of 100 °C minimum.

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SIST EN 61249-2-41:2010
61249-2-41 © IEC:2010 – 7 –
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.
3.2 Metal foil
Copper as specified in IEC 61249-5-1. The preferred foils are electrodeposited of defined
ductility.
3.3 Reinforcement
Woven E-glass as it will be specified in future IEC 61249-6-3, woven E-glass fabric (for the
manufacture of prepreg and copper clad material) as the surface sheet on each side of a core
reinforcement comprised of cellulose paper.
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)
Surface resistance after damp heat 2E04 ≥3 000 MΩ
while in the humidity chamber
Surface resistance after damp heat 2E03 ≥30 000 MΩ
and recovery (optional)
Volume resistivity after damp heat 2E04
≥1 000 MΩm
while in the humidity chamber
Volume resistivity after damp heat and 2E04
≥5 000 MΩm
recovery (optional)
Relative permittivity after damp heat 2E10
≤5,4
and recovery (1 MHz)
Loss tangent after damp heat and 2E10 ≤0,045
recovery (1 MHz)
Arc resistance  2E14 ≥60 s
Dielectric breakdown (only for material 2E15
≥40 kV
thickness ≥0,60 mm thickness)
Surface resistance at 100 °C 2E04
≥1 000 MΩ
Volume resistivity at 100 °C 2E04
≥1 00 MΩm

6 Non-electrical properties of the copper-clad laminate
6.1 Appearance of the copper-clad sheet
The copper-clad face shall be substantially free from defects that may have an impact on the
material’s fitness for use for the intended purpose.

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SIST EN 61249-2-41:2010
– 8 – 61249-2-41 © IEC:2010
For the following specific defects, the requirements given shall apply when inspection is made
in accordance with IEC 61189-2, method 2M18.
6.1.1 Indentations (pits and dents)
The size of an indentation, usually the length, shall be determined and given a point value to be
used as measure of the quality.
Size Point value for each
mm indentation
0,13 – 0,25 1
0,26 – 0,50 2
0,51 – 0,75 4
0,76 – 1,00 7
Over 1,00 30

The total point count for any 300 mm × 300 mm area shall be calculated to determine the class
of the material.
• Class A 29 maximum
• Class B 17 maximum
• Class C 5 maximum
• Class D 0
• Class X To be agreed upon by user and supplier
The required class of material shall be specified in the purchase order. Class A applies unless
otherwise specified.
6.1.2 Wrinkles
There shall be no wrinkles in the copper surface.
6.1.3 Scratches
Scratches deeper than 10 μm or 20 % of the nominal thickness of the foil thickness, whichever
is lower, are not permitted.
Scratches with a depth less than 5 % of the nominal thickness of the foil shall not be counted
unless this depth is 10 μm or more.
Scratches with a depth between 5 % and 20 % of the nominal thickness of the foil are
permitted to a total length of 100 mm for a 300 mm × 300 mm area.
6.1.4 Raised areas
Raised areas are usually impressions in the press plates used during manufacture but may
also be caused by blisters or inclusions of foreign particles under the foil.
Raised areas caused by blisters or inclusions are not permitted.
Raised areas being impressions of defects in press plates are permitted to the following extent:
– Class A and X material maximum height 15 μm and maximum length 15 mm;
– Class B and C material maximum height 8 μm and maximum length 15 mm;

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SIST EN 61249-2-41:2010
61249-2-41 © IEC:2010 – 9 –
– Class D material maximum height 5 μm and maximum length 15 mm.
6.1.5 Surface waviness
Under consideration.
6.2 Appearance of the unclad face
The unclad face of single side clad sheet shall have the natural appearance resulting from the
curing process. Small irregularities in colour are permitted. The gloss of the unclad face shall
be that given by the press plate, release film, or release foil used. Variations of gloss due to
the impact of pressure of gases released during the curing are permitted.
6.3 Laminate thickness
If the copper-clad laminate is tested in accordance with test method 2D01 of IEC 61189-2, the
thickness shall not depart from the nominal thickness by more than the appropriate value
shown in Table 2. The fine tolerances shall apply unless the other tolerances are ordered.
Table 2 – Nominal thickness and tolerance of metal-clad laminate
Property Test method Nominal thickness Tolerance requirement
(IEC 61189-2) including metal foil
± mm
mm
Coarse Fine Extra fine
Thickness 2D01 ≥0,60 <0,80 0,08 0,06 0,05
0,17 0,10 0,08
≥0,80 <1,00
0,19 0,13 0,08
≥1,00 ≤1,70

The thickness and tolerances do not apply to the outer 25 mm of the trimmed master sheet or
the outer 13 mm of the cut-to-size panel as manufactured and delivered by the supplier. At no
point shall the thickness vary from the nominal by a value greater than 125 % of the specified
tolerance.
6.4 Bow and twist
When the copper-clad laminate is tested in accordance with test method 2M01 of IEC 61189-2,
the bow and twist shall not exceed the values given in Table 3.
Table 3 – Bow and twist requirements
Property Test method Nominal Panel dimension Requirements
thickness longest side %
(IEC 61189-2)

Copper foil on Copper foil on
mm mm
one side both sides
Bow and twist 2M01
≤350 ≤3,0 ≤2,5
≥0,6 ≤1,3 >350 ≤500 ≤2,8 ≤2,3
>500 ≤2,5 ≤2,0
≤350 ≤2,5 ≤2,0
>1,3 <1,7
>350 ≤500 ≤2,3 ≤1,8

>500 ≤2,0 ≤1,5

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SIST EN 61249-2-41:2010
– 10 – 61249-2-41 © IEC:2010
NOTE The requirements for bow and twist apply only to one sided copper-clad laminates with maximum foil
2
thickness of 105 μm (915 g/m ) and double sided copper-clad laminates with maximum foil thickness difference of
2
70 μm (610 g/m ).
Requirements
...