Materials for printed boards and other interconnecting structures - Part 2-43: Reinforced base materials clad and unclad - Non-halogenated epoxide cellulose paper/woven E-glass reinforced laminate sheets of defined flammability (vertical burning test), copper-clad for lead-free assembly

IEC 61249-2-43:2016 gives requirements for properties of non-halogenated 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 non-halogenated fire retardants reacted as part of the epoxide polymeric structure. The glass transition temperature is defined to be 100 °C minimum.

Matériaux pour circuits imprimés et autres structures d'interconnexion - Partie 2-43: Matériaux de base renforcés, plaqués et non plaqués - Feuilles stratifiées renforcées en verre de type E tissé/papier cellulose époxyde non halogéné, plaquées cuivre, d'inflammabilité définie (essai de combustion verticale) pour les assemblages sans plomb

L'IEC 61249-2-43:2016 fournit des exigences relatives aux propriétés des feuilles stratifiées de surface renforcées en verre de type E tissé et à coeur renforcé en papier cellulose époxyde non halogéné, 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 assignées d'inflammabilité sont obtenues en faisant réagir des ignifuges non halogénés qui font partie de la structure polymère époxyde. La température de transition vitreuse a été définie comme étant 100 °C au minimum.

General Information

Status
Published
Publication Date
11-May-2016
Current Stage
PPUB - Publication issued
Start Date
12-May-2016
Completion Date
12-May-2016
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IEC 61249-2-43:2016 - Materials for printed boards and other interconnecting structures - Part 2-43: Reinforced base materials clad and unclad - Non-halogenated epoxide cellulose paper/woven E-glass reinforced laminate sheets of defined flammability (vertical burning test), copper-clad for lead-free assembly
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IEC 61249-2-43
Edition 1.0 2016-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Materials for printed boards and other interconnecting structures –
Part 2-43: Reinforced base materials clad and unclad – Non-halogenated
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 2-43: Matériaux de base renforcés, plaqués et non plaqués – Feuilles
stratifiées renforcées en verre de type E tissé/papier cellulose époxyde non
halogéné, plaquées cuivre, d’inflammabilité définie (essai de combustion
verticale) pour les assemblages sans plomb
IEC 61249-2-43:2016-05(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61249-2-43
Edition 1.0 2016-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Materials for printed boards and other interconnecting structures –
Part 2-43: Reinforced base materials clad and unclad – Non-halogenated
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 2-43: Matériaux de base renforcés, plaqués et non plaqués – Feuilles
stratifiées renforcées en verre de type E tissé/papier cellulose époxyde non
halogéné, plaquées cuivre, d’inflammabilité définie (essai de combustion
verticale) pour les assemblages sans plomb
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.180 ISBN 978-2-8322-3393-1

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 61249-2-43:2016 © IEC 2016
CONTENTS

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

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

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

3 Materials and construction .............................................................................................6

3.1 General ................................................................................................................6

3.2 Resin system ........................................................................................................6

3.3 Metal foil ...............................................................................................................7

3.4 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 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

6.1.6 Surface waviness ...........................................................................................9

6.2 Appearance of the unclad face ..............................................................................9

6.3 Laminate thickness ...............................................................................................9

6.4 Bow and twist .......................................................................................................9

6.5 Properties related to the copper foil bond ............................................................ 10

6.6 Punching and machining ..................................................................................... 11

6.7 Dimensional stability ........................................................................................... 11

6.8 Sheet sizes ......................................................................................................... 11

6.8.1 Typical sheet sizes ...................................................................................... 11

6.8.2 Tolerances for sheet sizes ........................................................................... 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

7 Non-electrical properties of the base material after complete removal of the

copper foil ................................................................................................................... 12

7.1 Appearance of the dielectric base material .......................................................... 12

7.2 Flexural strength ................................................................................................. 13

7.3 Flammability ....................................................................................................... 13

7.4 Water absorption ................................................................................................ 14

7.5 Measling ............................................................................................................. 14

7.6 Glass transition temperature and cure factor ....................................................... 14

7.7 Decomposition temperature ................................................................................. 14

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

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

---------------------- Page: 4 ----------------------
IEC 61249-2-43:2016 © IEC 2016 – 3 –

8.5 Certificate of conformance .................................................................................. 15

8.6 Safety data sheet ................................................................................................ 16

9 Packaging and marking ............................................................................................... 16

10 Ordering information .................................................................................................... 16

Annex A (informative) Engineering information ................................................................... 17

A.1 General .............................................................................................................. 17

A.2 Chemical properties ............................................................................................ 17

A.3 Electrical properties ............................................................................................ 17

A.4 Flammability properties ....................................................................................... 17

A.5 Mechanical properties ......................................................................................... 17

A.6 Physical properties ............................................................................................. 17

A.7 Thermal properties .............................................................................................. 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 – Size and 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 – Flexural strength requirements ............................................................................ 13

Table 10 – Flammability requirements ................................................................................. 13

Table 11 – Water absorption requirements .......................................................................... 14

Table 12 – Measling requirements ...................................................................................... 14

Table 13 – Glass transition temperature and cure factor requirements ................................. 14

Table 14 – Decomposition temperature requirements .......................................................... 14

Table 15 – Time to delamination requirements .................................................................... 15

Table C.1 – Qualification and conformance inspection ......................................................... 20

---------------------- Page: 5 ----------------------
– 4 – IEC 61249-2-43:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MATERIALS FOR PRINTED BOARDS
AND OTHER INTERCONNECTING STRUCTURES –
Part 2-43: Reinforced base materials clad and unclad –
Non-halogenated 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

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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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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 61249-2-43 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
91/1350/FDIS 91/1363/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.
---------------------- Page: 6 ----------------------
IEC 61249-2-43:2016 © IEC 2016 – 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.
---------------------- Page: 7 ----------------------
– 6 – IEC 61249-2-43:2016 © IEC 2016
MATERIALS FOR PRINTED BOARDS
AND OTHER INTERCONNECTING STRUCTURES –
Part 2-43: Reinforced base materials clad and unclad –
Non-halogenated 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 non-halogenated 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 non-

halogenated 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 documents, in whole or in part, are normatively referenced in this document

and are indispensable for its application. 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 Materials and construction
3.1 General

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

3.2 Resin system

Non-halogen epoxide, filled or unfilled, resulting in a laminate with a glass transition

temperature of 100 °C minimum. The maximum total halogens contained in the resin plus

−3 −4

reinforcement matrix is 1,5 × 10 parts (1 500 ppm) with a maximum chlorine of 9 × 10

parts (900 ppm) parts and maximum bromine being 9 × 10 parts (900 ppm).
---------------------- Page: 8 ----------------------
IEC 61249-2-43:2016 © IEC 2016 – 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.

3.3 Metal foil

Copper as specified in IEC 61249-5-1. The preferred foils are electrodeposited of defined

ductility.
3.4 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 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)
Dissipation factor after damp heat and 2E10
≤0,045
recovery (1 MHz)
Arc resistance 2E14
≥60 s
Dielectric breakdown 2E15
≥40 kV
Surface resistance at 125 °C 2E07 ≥1 000 MΩ
Volume resistivity at 125 °C 2E07
≥1 000 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 may have an impact on the

material’s fitness for use for the intended purpose.
---------------------- Page: 9 ----------------------
– 8 – IEC 61249-2-43:2016 © IEC 2016

For the following specific defects, 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 measure of the quality as indicated in Table 2.
Table 2 – Size and 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 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.

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.
---------------------- Page: 10 ----------------------
IEC 61249-2-43:2016 © IEC 2016 – 9 –

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.
6.1.6 Surface waviness
Under consideration.
6.2 Appearance of the unclad face

The unclad face of a 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 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 thickness 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 61249-2-43:2016 © IEC 2016
Table 4 – Bow and twist requirements
Property Test method Nominal
...

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