SIST EN IEC 61249-2-47:2018

Materials for printed boards and other interconnecting structures - Part 2-47: Reinforced base materials clad and unclad - Non-halogenated epoxide non-woven/woven E-glass reinforced laminate sheets of thermal conductivity （2.0W/m K）and defined flammability (vertical burning test), copper-clad for lead-free assembly

This part of IEC 61249 gives requirements for properties of non-halogenated epoxide
non-woven reinforced core/woven E-glass reinforced surface laminate sheets of thermal
conductivity and 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 non-halogenated fire retardants reacted as part of the epoxide polymeric structure. The
glass transition temperature is defined to be 105 °C minimum. Thermal conductivity is defined
to be (2,0 ± 0,30) W/(m•K).

Materialien für Leiterplatten und andere Verbindungsstrukturen – Teil 2-47: Kaschierte und unkaschierte verstärkte Basismaterialien – Kupferkaschierte, mit E-Glaswirrfaser im Kernbereich und E-Glasgewebe in den Außenlagen verstärkte Laminattafeln auf der Basis von halogenfreiem Epoxidharz mit Wärmeleitfähigkeit 2,0 W/(m•K) und definierter Brennbarkeit (vertikale Prüflingslage) für bleifreie Bestückungstechnik

Matériaux pour circuits imprimés et autres structures d’interconnexion – Partie 2-47: Matériaux de base renforcés, plaqués et non plaqués – Feuilles stratifiées renforcées en verre de type E tissé/non tissé époxyde non halogéné, plaquées cuivre de conductivité thermique 2,0 W/(m•K) et d’inflammabilité définie (essai de combustion verticale) pour les assemblages sans plomb

L’IEC 61249-2-47:2018 donne les exigences relatives aux propriétés des feuilles stratifiées de surface renforcée en verre de type E tissé et à cœur renforcé non tissé époxyde non halogéné, de conductivité thermique et d’inflammabilité définie (essai de combustion verticale), plaquées cuivre pour les assemblages sans plomb, d’épaisseurs comprises entre 0,60 mm et 1,70 mm. Les caractéristiques d’inflammabilité sont obtenues en faisant réagir des ignifuges non halogénés qui font partie de la structure polymère époxyde. La température de transition vitreuse est définie comme étant d’au moins 105 °C. La conductivité thermique est définie comme étant de (2,0 ± 0,30) W/(m•K).

Materiali za plošče tiskanih vezij in druge povezovalne strukture - 2-47. del: Pokovinjeni in nepokovinjeni ojačeni osnovni materiali - Z bakrom pokovinjeni laminat s toplotno prevodnostjo (2,0W/m K) in z določeno gorljivostjo (navpični preskus gorljivosti), s površino z netkanim/tkanim E-steklom za sestavljanje brez svinca

Ta del standarda IEC 61249 podaja zahteve za lastnosti z bakrom pokovinjenega laminata s toplotno prevodnostjo in z določeno gorljivostjo (navpični preskus gorljivosti), s površino z netkanim/tkanim E-steklom za sestavljanje brez svinca ter debelino od 0,60 mm do 1,70 mm. Ocena gorljivosti se doseže z uporabo nehalogeniranih zaščitnih sredstev proti ognju, ki reagirajo kot del epoksidne polimerne strukture. Točka posteklenitve je opredeljena kot najmanj 105 °C. Toplotna prevodnost je opredeljena kot (2,0 ± 0,30) W/(m•K).

General Information

• Status: Published
• Publication Date: 06-Sep-2018
• 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: 08-Aug-2018
• Due Date: 13-Oct-2018
• Completion Date: 07-Sep-2018
• Ref Project: EN IEC 61249-2-47:2018 - Materials for printed boards and other interconnecting structures – Part 2-47: Reinforced base materials clad and unclad – Non-halogenated epoxide non-woven/woven E-glass reinforced laminate sheets of thermal conductivity 2.0 W/(m•K) and defined flammability (vertical burning test), copper-clad for lead-free assembly

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 61249-2-47:2018
01-oktober-2018
0DWHULDOL]DSORãþHWLVNDQLKYH]LMLQGUXJHSRYH]RYDOQHVWUXNWXUHGHO
3RNRYLQMHQLLQQHSRNRYLQMHQLRMDþHQLRVQRYQLPDWHULDOL=EDNURPSRNRYLQMHQL
ODPLQDWVWRSORWQRSUHYRGQRVWMR:P.LQ]GRORþHQRJRUOMLYRVWMRQDYSLþQL
SUHVNXVJRUOMLYRVWLVSRYUãLQR]QHWNDQLPWNDQLP(VWHNORP]DVHVWDYOMDQMHEUH]
VYLQFD
0DWHULDOVIRUSULQWHGERDUGVDQGRWKHULQWHUFRQQHFWLQJVWUXFWXUHV3DUW5HLQIRUFHG
EDVHPDWHULDOVFODGDQGXQFODG1RQKDORJHQDWHGHSR[LGHQRQZRYHQZRYHQ(JODVV
UHLQIRUFHGODPLQDWHVKHHWVRIWKHUPDOFRQGXFWLYLW\:P.DQGGHILQHGIODPPDELOLW\
YHUWLFDOEXUQLQJWHVWFRSSHUFODGIRUOHDGIUHHDVVHPEO\
Ta slovenski standard je istoveten z: EN IEC 61249-2-47:2018
ICS:
31.180 7LVNDQDYH]MD7,9LQWLVNDQH Printed circuits and boards
SORãþH
SIST EN IEC 61249-2-47:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 61249-2-47:2018

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SIST EN IEC 61249-2-47:2018


EUROPEAN STANDARD EN IEC 61249-2-47

NORME EUROPÉENNE

EUROPÄISCHE NORM
March 2018
ICS 31.180

English Version
Materials for printed boards and other interconnecting structures
- Part 2-47: Reinforced base materials clad and unclad - Non-
halogenated epoxide non-woven/woven E-glass reinforced
laminate sheets of thermal conductivity (2.0W/m K) and defined
flammability (vertical burning test), copper-clad for lead-free
assembly
(IEC 61249-2-47:2018)
Matériaux pour circuits imprimés et autres structures Materialien für Leiterplatten und andere
d'interconnexion - Partie 2-47 : Matériaux de base Verbindungsstrukturen - Teil 2-47: Kaschierte und
renforcés, plaqués et non plaqués - Feuilles stratifiées unkaschierte verstärkte Basismaterialien -
renforcées en verre de type E tissé/non tissé époxyde non Kupferkaschierte, mit E-Glaswirrfaser im Kernbereich und
halogéné, plaquées cuivre de conductivité thermique E-Glasgewebe in den Außenlagen verstärkte Laminattafeln
(2,0W/m m•K) et d'inflammabilité définie (essai de auf der Basis von halogenfreiem Epoxidharz mit
combustion verticale) pour les assemblages sans plomb Wärmeleitfähigkeit (2,0 W/m•K) und definierter Brennbarkeit
(IEC 61249-2-47:2018) (vertikale Prüflingslage) für bleifreie Bestückungstechnik
(IEC 61249-2-47:2018)
This European Standard was approved by CENELEC on 2018-02-14. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 61249-2-47:2018 E

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SIST EN IEC 61249-2-47:2018
EN IEC 61249-2-47:2018 (E)
European foreword
The text of document 91/1449/FDIS, future edition 1 of IEC 61249-2-47, prepared by IEC/TC 91
"Electronics assembly technology" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 61249-2-47:2018.

The following dates are fixed:
(dop) 2018-11-14
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-02-14
standards conflicting with the
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 61249-2-47:2018 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:

ISO 9000 NOTE Harmonized as EN ISO 9000.
ISO 14001 NOTE Harmonized as EN ISO 14001.
2

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SIST EN IEC 61249-2-47:2018
EN IEC 61249-2-47:2018 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.

NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.

Publication Year Title EN/HD Year
IEC 61189-2 2006 Test methods for electrical materials, EN 61189-2 2006
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 - 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)
IEC/PAS 61249-6-3 -  Specification for finished fabric woven from - -
"E" glass for printed boards
ISO 11014 -  Safety data sheet for chemical products - - -
Content and order of sections


3

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SIST EN IEC 61249-2-47:2018

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SIST EN IEC 61249-2-47:2018



IEC 61249-2-47

®


Edition 1.0 2018-01




INTERNATIONAL



STANDARD



















Materials for printed boards and other interconnecting structures –

Part 2-47: Reinforced base materials clad and unclad – Non-halogenated

epoxide non-woven/woven E-glass reinforced laminate sheets of thermal


conductivity 2,0 W/(m•K) and defined flammability (vertical burning test),

copper-clad for lead-free assembly























INTERNATIONAL

ELECTROTECHNICAL


COMMISSION





ICS 31.180 ISBN 978-2-8322-5198-0



  Warning! Make sure that you obtained this publication from an authorized distributor.


® Registered trademark of the International Electrotechnical Commission

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SIST EN IEC 61249-2-47:2018
– 2 – IEC 61249-2-47:2018 © IEC 2018
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions. 6
4 Materials and construction . 7
4.1 General . 7
4.2 Resin system . 7
4.3 Metal foil . 7
4.4 Reinforcement . 7
5 Electrical properties . 7
6 Non-electrical properties of the copper-clad laminate . 8
6.1 Appearance of the copper-clad sheet. 8
6.1.1 General . 8
6.1.2 Indentations (pits and dents) . 8
6.1.3 Wrinkles . 8
6.1.4 Scratches . 8
6.1.5 Raised areas . 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 . 11
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
6.10 Thermal conductivity . 12
7 Non-electrical properties of the base material after complete removal of the copper
foil . 13
7.1 Appearance of the dielectric base material . 13
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 . 14
7.7 Decomposition temperature . 15
7.8 Time to delamination (TMA) . 15
7.9 Halogen content . 15
8 Quality assurance . 15
8.1 Quality system . 15
8.2 Responsibility for inspection . 16
8.3 Qualification inspection . 16
8.4 Quality conformance inspection . 16

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SIST EN IEC 61249-2-47:2018
IEC 61249-2-47:2018 © IEC 2018 – 3 –
8.5 Certificate of conformance . 16
8.6 Safety data sheet . 16
9 Packaging and marking . 16
10 Ordering information . 17
Annex A (informative) Engineering information . 18
A.1 General . 18
A.2 Chemical properties . 18
A.3 Electrical properties . 18
A.4 Flammability properties . 18
A.5 Mechanical properties . 18
A.6 Physical properties . 18
A.7 Thermal properties . 18
Annex B (informative) Common laminate constructions . 20
Annex C (informative) Guideline for qualification and conformance inspection . 21
Bibliography . 22

Table 1 – Electrical properties . 7
Table 2 – Size of indentations . 8
Table 3 – Nominal thickness and tolerance of metal-clad laminate . 9
Table 4 – Bow and twist requirements . 10
Table 5 – Pull-off and peel strength requirements . 10
Table 6 – Dimensional stability . 11
Table 7 – Size tolerances for cut panels . 12
Table 8 – Rectangularity of cut panels . 12
Table 9 – Thermal conductivity . 12
Table 10 – Flexural strength requirements . 13
Table 11 – Flammability requirements . 14
Table 12 – Water absorption requirements . 14
Table 13 – Measling requirements . 14
Table 14 – Glass transition temperature and cure factor requirements . 15
Table 15 – Decomposition temperature requirements . 15
Table 16 – Time to delamination requirements. 15
Table 17 – Halogen content . 15
Table C.1 – Qualification and conformance inspection . 21

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SIST EN IEC 61249-2-47:2018
– 4 – IEC 61249-2-47:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

MATERIALS FOR PRINTED BOARDS AND OTHER
INTERCONNECTING STRUCTURES –

Part 2-47: Reinforced base materials clad and unclad – Non-halogenated
epoxide non-woven/woven E-glass reinforced laminate sheets of
thermal conductivity 2,0 W/(m•K) and 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 61249-2-45 has been prepared by IEC technical committee 91:
Electronics assembly technology.
The text of this International Standard is based on the following documents:
CDV Report on voting
91/1449/FDIS 91/1485/RVC

Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.

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SIST EN IEC 61249-2-47:2018
IEC 61249-2-47:2018 © IEC 2018 – 5 –
This document 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 document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

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SIST EN IEC 61249-2-47:2018
– 6 – IEC 61249-2-47:2018 © IEC 2018
MATERIALS FOR PRINTED BOARDS AND OTHER
INTERCONNECTING STRUCTURES –

Part 2-47: Reinforced base materials clad and unclad – Non-halogenated
epoxide non-woven/woven E-glass reinforced laminate sheets of
thermal conductivity 2,0 W/(m•K) and defined flammability
(vertical burning test), copper-clad for lead-free assembly



1 Scope
This part of IEC 61249 gives requirements for properties of non-halogenated epoxide
non-woven reinforced core/woven E-glass reinforced surface laminate sheets of thermal
conductivity and 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 non-halogenated fire retardants reacted as part of the epoxide polymeric structure. The
glass transition temperature is defined to be 105 °C minimum. Thermal conductivity is defined
to be (2,0 ± 0,30) W/(m•K).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements 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)
IEC/PAS 61249-6-3, Specification for finished fabric woven from "E" glass for printed boards
ISO 11014, Safety data sheet for chemical products – Content and order of sections
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp

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SIST EN IEC 61249-2-47:2018
IEC 61249-2-47:2018 © IEC 2018 – 7 –
4 Materials and construction
4.1 General
The sheet consists of an insulating base with metal foil bonded to one side or both.
4.2 Resin system
Non-halogenated epoxide, filled, resulting in a laminate with a glass transition temperature of
105 °C minimum.
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.
4.3 Metal foil
Copper as specified in IEC 61249-5-1, copper foil (for the manufacture of copper-clad
materials). The preferred foils are electrodeposited of defined ductility.
4.4 Reinforcement
Woven E-glass as specified in IEC/PAS 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 non-woven E-glass mat.
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
≥5 000 MΩ
while in the humidity chamber
Surface resistance after damp heat 2E04
≥40 000 MΩ
and recovery (optional)
Volume resistivity after damp heat 2E04 ≥5 000 MΩm
while in the humidity chamber
Volume resistivity after damp heat and 2E04 ≥10 000 MΩm
recovery (optional)
Relative permittivity after damp heat 2E10 ≤6,6
and recovery (1 MHz)
Dissipation factor after damp heat and 2E10 ≤0,040
recovery (1 MHz)
Arc resistance 2E14 ≥60 s
2E15
Dielectric breakdown ≥40 kV
Surface resistance at 125 °C 2E04
≥1 000 MΩ
Volume resistivity at 125 °C 2E04
≥1 00 MΩm

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SIST EN IEC 61249-2-47:2018
– 8 – IEC 61249-2-47:2018 © IEC 2018
6 Non-electrical properties of the copper-clad laminate
6.1 Appearance of the copper-clad sheet
6.1.1 General
The copper-clad face shall be substantially free from defects that can have an impact on the
material's fitness for use for the intended purpose.
For the defects given in 6.1.2 to 6.1.5, the requirements given shall apply when inspection is
made in accordance with IEC 61189-2, method 2M18.
6.1.2 Indentations (pits and dents)
The size of an indentation, usually the length, shall be determined and given a point value to be
used as a measure of the quality as indicated in Table 2.
Table 2 – Size of indentations
Size
Point value for each indentation
mm
0,13 to 0,25 1
0,26 to 0,50 2
0,51 to 0,75 4
0,76 to 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.
6.1.3 Wrinkles
There shall be no wrinkles in the copper surface.
The inspection area shall exclude a 13 mm border from the edge of the panel or sheet.
6.1.4 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 of less than 5 % of the nominal thickness of the foil shall not be
counted unless this depth is 10 µm or more.

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SIST EN IEC 61249-2-47:2018
IEC 61249-2-47:2018 © IEC 2018 – 9 –
Scratches with a depth of 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.
The inspection area shall exclude a 13 mm border from the edge of the panel or sheet.
6.1.5 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;
– Class D material maximum height 5 µm and maximum length 15 mm.
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 the pressure of gases released during the curing are permitted.
6.3 Laminate thickness
If the copper-clad laminate is tested in accordanc
...