Materials for printed boards and other interconnecting structures - Part 2-46: Reinforced base materials clad and unclad - Non-halogenated epoxide non-woven/woven E-glass reinforced laminate sheets of thermal conductivity 1,5 W/(m•K) and defined flammability (vertical burning test), copper-clad for lead-free assembly

IEC 61249-2-46:2018 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 (1,5 ± 0,2) W/(m•K).

Matériaux pour circuits imprimés et autres structures d'interconnexion - Partie 2-46: Matériaux de base renforcés, plaqués et non plaqués - Feuilles stratifiées renforcées en verre de type E tissé/non tissé époxyde non halogéné, de conductivité thermique 1,5 W/(m•K) et d'inflammabilité définie (essai de combustion verticale), plaquées cuivre pour les assemblages sans plomb

L'IEC 61249-2-46:2018 fournit des exigences concernant les 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. La température de transition vitreuse est définie comme étant d'au moins 105 °C. La conductivité thermique est définie comme étant de (1,5 ± 0,2) W/(m•K).

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Published
Publication Date
09-Jan-2018
Current Stage
PPUB - Publication issued
Completion Date
10-Jan-2018
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IEC 61249-2-46:2018 - Materials for printed boards and other interconnecting structures - Part 2-46: Reinforced base materials clad and unclad - Non-halogenated epoxide non-woven/woven E-glass reinforced laminate sheets of thermal conductivity 1,5 W/(m•K) and defined flammability (vertical burning test), copper-clad for lead-free assembly
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IEC 61249-2-46:2018 - Materials for printed boards and other interconnecting structures - Part 2-46: Reinforced base materials clad and unclad - Non-halogenated epoxide non-woven/woven E-glass reinforced laminate sheets of thermal conductivity 1,5 W/(m•K) and defined flammability (vertical burning test), copper-clad for lead-free assembly
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IEC 61249-2-46
Edition 1.0 2018-01
INTERNATIONAL
STANDARD
Materials for printed boards and other interconnecting structures –
Part 2-46: Reinforced base materials clad and unclad – Non-halogenated
epoxide non-woven/woven E-glass reinforced laminate sheets of thermal
conductivity 1,5 W/(m•K) and defined flammability (vertical burning test),
copper-clad for lead-free assembly
IEC 61249-2-46:2018-01(en)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2018 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from

either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC

copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or

your local IEC member National Committee for further information.
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3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC

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---------------------- Page: 2 ----------------------
IEC 61249-2-46
Edition 1.0 2018-01
INTERNATIONAL
STANDARD
Materials for printed boards and other interconnecting structures –
Part 2-46: Reinforced base materials clad and unclad – Non-halogenated
epoxide non-woven/woven E-glass reinforced laminate sheets of thermal
conductivity 1,5 W/(m•K) and defined flammability (vertical burning test),
copper-clad for lead-free assembly
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.180 ISBN 978-2-8322-5196-6

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 61249-2-46:2018 © 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

---------------------- Page: 4 ----------------------
IEC 61249-2-46:2018 © 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 ................................................................................................ 19

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

---------------------- Page: 5 ----------------------
– 4 – IEC 61249-2-46:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MATERIALS FOR PRINTED BOARDS AND OTHER
INTERCONNECTING STRUCTURES –
Part 2-46: Reinforced base materials clad and unclad – Non-halogenated
epoxide non-woven/woven E-glass reinforced laminate sheets of
thermal conductivity 1,5 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 61249-2-46 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
91/1448/CDV 91/1484/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.
---------------------- Page: 6 ----------------------
IEC 61249-2-46:2018 © 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.
---------------------- Page: 7 ----------------------
– 6 – IEC 61249-2-46:2018 © IEC 2018
MATERIALS FOR PRINTED BOARDS AND OTHER
INTERCONNECTING STRUCTURES –
Part 2-46: Reinforced base materials clad and unclad – Non-halogenated
epoxide non-woven/woven E-glass reinforced laminate sheets of
thermal conductivity 1,5 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 (1,5 ± 0,2) 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
---------------------- Page: 8 ----------------------
IEC 61249-2-46:2018 © 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
≤6,1
and recovery (1 MHz)
Dissipation factor after damp heat and 2E10
≤0,040
recovery (1 MHz)
Arc resistance 2E14
≥60 s
Dielectric breakdown 2E15 ≥40 kV
Surface resistance at 125 °C 2E04 ≥1 000 MΩ
Volume resistivity at 125 °C 2E04
≥1 00 MΩm
---------------------- Page: 9 ----------------------
– 8 – IEC 61249-2-46:2018 © 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 6.1.6, 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
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.
---------------------- Page: 10 ----------------------
IEC 61249-2-46:2018 © 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 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 3. The fine tolerances shall apply unless the other tolerances are ordered.

Table 3 – Nominal thickness and tolerance of metal-clad laminate
Property Test method Nominal thickness Tolerance requirement
IEC 61189-2 including metal foil ± mm
Coarse Fine Extra fine
Thickness 2D01 0,08
≥0,60 <0,80 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 4.
---------------------- Page: 11 ----------------------
– 10 – IEC 61249-2-46:2018 © IEC 2018
Table 4 – Bow and twist requirements
Property Test method Nominal Panel Requirements
thickness dimension %
IEC 61189-2
mm longest side
Copper foil on Copper foil on
one side both sides
Bow and twist 2M01 ≤350 ≤2,5 ≤2,0
≥0,6 ≤1,3 >350 ≤500 ≤2,3 ≤1,8
>500 ≤2,0 ≤1,5
≤350 ≤2,0 ≤1,5
>1,3 ≤1,7 >350 ≤500 ≤1,8 ≤1,3
>500 ≤1,5 ≤1,0

The requirements for bow and twist apply only to one sided copper-clad laminates with maximum foil thickness of

105 µm (915 g/m ) and double sided copper-clad laminates with maximum foil thickness difference of 70 µm

(610 g/m ).

Requirements for laminates with copper foil configurations beyond these limits should be subject to agreement

between purchaser and supplier.
6.5 Properties related to the copper foil bond

Pull-off and peel strength requirements are shown in Table 5. These requirements apply to

copper foil with a normal profile depth.
Table 5 – Pull-off and peel strength requirements
Test method
Property Requirement
IEC 61189-2
Pull-off strength 2M05
≥25 N
Thickness of the copper foil
18 µm
≥35 µm ≥70 µm
2 2
(152 g/m )
(305 g/m ) (610 g/m )
Peel strength after heat 2M14 ≥0,8 N/mm ≥1,0 N/mm ≥1,2 N/mm
shock 288 °C, 20 s
No blistering or delamination

Peel strength after dry 2M15 Under consideration Under consideration Under consideration

heat 125 °C
No blistering or delamination
Peel strength after 2M06 ≥0,8 N/mm ≥1,0 N/mm ≥1,2 N/mm
exposure to solvent
vapour. Solvents as
agreed upon between
No blistering or delamination
purchaser and supplier

Peel strength after 2M16 Under consideration Under consideration Under consideration

simulated plating
No blistering or delamination
Peel strength at high 2M17
temperature
≥0,6 N/mm ≥0,7 N/mm ≥0,9 N/mm
Temperature 125 °C
(optional)
Blistering after 288 °C,
2C05 No blistering or delamination
20 s heat shock

In case of difficulty due to breakage of the foil or reading range of the force measuring device, the measurement

of peel strength at high temperature may be carried out using conductor widths of more than 3 mm.

---------------------- Page: 12 ----------------------
IEC 61249-2-46:2018 © IEC 2018 – 11 –
6.6 Punching and machining

The laminate shall, in accordance with the manufacturer's recommendations, be capable of

being punched, sheared or drilled. Delamination at the edges due to the shearing process is

permissible, provided that the depth of delamination is not larger than the thickness of the base

material. Delamination at the edges of drilled holes due to the drilling process is not

permissible. Drilled holes shall be capable of being through-plated with no interference from

any exudations into the hole.

A suitable test method for evaluating punching is 2M19 of IEC 61189-2. Requirements for

punching force and pull-out force are matters for agreement between user and supplier.

6.7 Dimensional stab
...

IEC 61249-2-46
Edition 1.0 2018-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Materials for printed boards and other interconnecting structures –
Part 2-46: Reinforced base materials clad and unclad – Non-halogenated epoxide
non-woven/woven E-glass reinforced laminate sheets of thermal conductivity
1,5 W/(m•K) and defined flammability (vertical burning test), copper-clad for
lead-free assembly
Matériaux pour circuits imprimés et autres structures d'interconnexion –
Partie 2-46: Matériaux de base renforcés, plaqués et non plaqués – Feuilles
stratifiées renforcées en verre de type E tissé/non tissé époxyde non halogéné,
de conductivité thermique 1,5 W/(m•K) et d'inflammabilité définie (essai de
combustion verticale), plaquées cuivre pour les assemblages sans plomb
IEC 61249-2-46:2018-01(en-fr)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2018 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from

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copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or

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Switzerland
About the IEC

The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes

International Standards for all electrical, electronic and related technologies.
About IEC publications

The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the

latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org

The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,

variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English

committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.

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---------------------- Page: 2 ----------------------
IEC 61249-2-46
Edition 1.0 2018-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Materials for printed boards and other interconnecting structures –
Part 2-46: Reinforced base materials clad and unclad – Non-halogenated epoxide
non-woven/woven E-glass reinforced laminate sheets of thermal conductivity
1,5 W/(m•K) and defined flammability (vertical burning test), copper-clad for
lead-free assembly
Matériaux pour circuits imprimés et autres structures d'interconnexion –
Partie 2-46: Matériaux de base renforcés, plaqués et non plaqués – Feuilles
stratifiées renforcées en verre de type E tissé/non tissé époxyde non halogéné,
de conductivité thermique 1,5 W/(m•K) et d'inflammabilité définie (essai de
combustion verticale), plaquées cuivre pour les assemblages sans plomb
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.180 ISBN 978-2-8322-9096-5

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

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61249-2-46:2018 © IEC 2018
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

4 Materials and construction ............................................................................................... 6

4.1 General ................................................................................................................... 6

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 ...................................................... 7

6.1 Appearance of the copper-clad sheet ...................................................................... 7

6.1.1 General ........................................................................................................... 7

6.1.2 Indentations (pits and dents) ........................................................................... 8

6.1.3 Wrinkles .......................................................................................................... 8

6.1.4 Scratches ........................................................................................................ 8

6.1.5 Raised areas ................................................................................................... 8

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 ......................................................... 15

7.7 Decomposition temperature .................................................................................. 15

7.8 Time to delamination (TMA) .................................................................................. 15

7.9 Halogen content .................................................................................................... 15

8 Quality assurance .......................................................................................................... 16

8.1 Quality system ...................................................................................................... 16

8.2 Responsibility for inspection ................................................................................. 16

8.3 Qualification inspection ......................................................................................... 16

---------------------- Page: 4 ----------------------
IEC 61249-2-46:2018 © IEC 2018 – 3 –

8.4 Quality conformance inspection ............................................................................ 16

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 ................................................................................................ 19

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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– 4 – IEC 61249-2-46:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MATERIALS FOR PRINTED BOARDS AND OTHER
INTERCONNECTING STRUCTURES –
Part 2-46: Reinforced base materials clad and unclad – Non-halogenated
epoxide non-woven/woven E-glass reinforced laminate sheets of
thermal conductivity 1,5 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,

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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

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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

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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

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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 61249-2-46 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
91/1448/CDV 91/1484/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.
---------------------- Page: 6 ----------------------
IEC 61249-2-46:2018 © 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.
---------------------- Page: 7 ----------------------
– 6 – IEC 61249-2-46:2018 © IEC 2018
MATERIALS FOR PRINTED BOARDS AND OTHER
INTERCONNECTING STRUCTURES –
Part 2-46: Reinforced base materials clad and unclad – Non-halogenated
epoxide non-woven/woven E-glass reinforced laminate sheets of
thermal conductivity 1,5 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 (1,5 ± 0,2) 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
4 Materials and construction
4.1 General

The sheet consists of an insulating base with metal foil bonded to one side or both.

---------------------- Page: 8 ----------------------
IEC 61249-2-46:2018 © IEC 2018 – 7 –
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 ≤6,1
and recovery (1 MHz)
Dissipation factor after damp heat and 2E10 ≤0,040
recovery (1 MHz)
Arc resistance 2E14
≥60 s
Dielectric breakdown 2E15 ≥40 kV
Surface resistance at 125 °C 2E04 ≥1 000 MΩ
Volume resistivity at 125 °C 2E04
≥1 00 MΩm
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.
---------------------- Page: 9 ----------------------
– 8 – IEC 61249-2-46:2018 © IEC 2018

For the defects given in 6.1.2 to 6.1.6, 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
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.

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.
---------------------- Page: 10 ----------------------
IEC 61249-2-46:2018 © IEC 2018 – 9 –
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 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 3. The fine tolerances shall apply unless the other tolerances are ordered.

Table 3 – Nominal thickness and tolerance of metal-clad laminate
Property Test method Nominal thickness Tolerance requirement
IEC 61189-2 including metal foil ± mm
Coarse Fine Extra fine
Thickness 2D01 0,08 0,06 0,05
≥0,60 <0,80
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 4.
-----
...

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