BS EN
61249-2-21:
2003

BRITISH STANDARD

Materials for printed
boards and other
interconnecting
structures —
Part 2-21: Reinforced base materials,
clad and unclad — Non-halogenated
epoxide woven E-glass reinforced
laminated sheets of defined
flammability (vertical burning test),
copper-clad

--```,,,-`-`,,`,,`,`,,`---

The European Standard EN 61249-2-21:2003 has the status of a
British Standard

ICS 31.180

12&23<,1*:,7+287%6,3(50,66,21(;&(37$63(50,77('%<&23<5,*+7/$:

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BS EN 61249-2-21:2003

National foreword
This British Standard is the official English language version of
EN 61249-2-21:2003. It is identical with IEC 61249-2-21:2003.
The UK participation in its preparation was entrusted to Technical Committee
EPL/501, Electronic assembly technology, which has the responsibility to:
—

aid enquirers to understand the text;

—

present to the responsible international/European committee any
enquiries on the interpretation, or proposals for change, and keep the
UK interests informed;

—

monitor related international and European developments and
promulgate them in the UK.

A list of organizations represented on this committee can be obtained on
request to its secretary.
Cross-references
The British Standards which implement international or European
publications referred to in this document may be found in the BSI Catalogue
under the section entitled “International Standards Correspondence Index”, or

by using the “Search” facility of the BSI Electronic Catalogue or of
British Standards Online.
This publication does not purport to include all the necessary provisions of a
contract. Users are responsible for its correct application.
Compliance with a British Standard does not of itself confer immunity
from legal obligations.

Summary of pages
This document comprises a front cover, an inside front cover, the EN title page,
pages 2 to 23 and a back cover.
The BSI copyright notice displayed in this document indicates when the
document was last issued.

This British Standard was
published under the authority
of the Standards Policy and
Strategy Committee on
16 February 2004

Amendments issued since publication
Amd. No.

Date

Comments

© BSI 16 February 2004

ISBN 0 580 43422 2
--```,,,-`-`,,`,,`,`,,`---


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EN 61249-2-21

EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM

December 2003

ICS 31.180
--```,,,-`-`,,`,,`,`,,`---

English version

Materials for printed boards and other interconnecting structures
Part 2-21: Reinforced base materials, clad and unclad –
Non-halogenated epoxide woven E-glass
reinforced laminated sheets of defined flammability
(vertical burning test), copper-clad
(IEC 61249-2-21:2003)
Matériaux pour circuits imprimés et autres
structures d'interconnexion
Partie 2-21: Matériaux de base renforcés

plaqués et non plaqués –
Feuilles stratifiées renforcées en tissu
de verre de type E époxyde non halogéné,
d'inflammabilité définie (essai de combustion
verticale) plaquées cuivre
(CEI 61249-2-21:2003)

Materialien für Verbindungsstrukturen
Teil 2-21: Kaschierte und unkaschierte
verstärkte Basismaterialien –
Kupferkaschierte mit E-Glasgewebe
verstärkte Laminattafeln auf der Basis
von halogenfreiem Epoxidharz
mit definierter Brennbarkeit
(Brennprüfung mit vertikaler Prüflingslage)
(IEC 61249-2-21:2003)

This European Standard was approved by CENELEC on 2003-12-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

CENELEC

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61249-2-21:2003 E

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Page 2
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EN 61249−2−21:2003
EN 61249-2-21:2003

-2-

Foreword

The text of document 91/409/FDIS, future edition 1 of IEC 61249-2-21, prepared by IEC TC 91,
Electronics assembly technology, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 61249-2-21 on 2003-12-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical

national standard or by endorsement

(dop) 2004-09-01

– latest date by which the national standards conflicting
with the EN have to be withdrawn

(dow) 2006-12-01

Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annex ZA is normative and annexes A, B and C are informative.
Annex ZA has been added by CENELEC.
__________

Endorsement notice
The text of the International Standard IEC 61249-2-21:2003 was approved by CENELEC as a
European Standard without any modification.
__________

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Page 3

EN 61249−2−21:2003

61249-2-21 ” IEC:2003

3 egaP

–3–

3002:12−2−94216 NE
-94216-212 ” 3002:CEI

–3–

CONTENTS

OFWERODR ...........................................................................................................................7

TNOCTNES

FOREWORD ...........................................................................................................................7
1 Scope .............................................................................................................................5
2 Normative references......................................................................................................5
S 1cpoe .............................................................................................................................5
3 Materials and construction ..............................................................................................5
oN 2rmitave referneces.....................................................................................................5.
3.1 Resin system .........................................................................................................6
3 3.2
etaMrisla
dna cnostrucnoit
.............................................................................................5.
Reinforcement
.......................................................................................................6

seR Metal
1.3in foil................................................................................................................6
sysetm .........................................................................................................6
3.3
nieR
2.3forcemtne
.......................................................................................................6
4 Internal marking ..............................................................................................................6
lateM 3.3
foil................................................................................................................6
5 Electrical
properties
........................................................................................................6
retnI 4lan marknig ..............................................................................................................6
6 Non-electrical properties of the copper-clad laminate ......................................................7
celE 5rtcila preporseit ........................................................................................................6
6.1 Appearance of the copper-clad sheet .....................................................................7
6 6.2
noN-electricp
lareporseit
fo eht ceppo-rcal
dalmietan ......................................................7
Appearance
of the unclad
face ...............................................................................8
1.6 Laminate
aeppArnacfo
e eht ceppo-rcdal
steeh .....................................................................7
6.3

thickness
................................................................................................8
2.6
aeppArnacfo
e
nu
ehtcdal
face
...............................................................................8
6.4 Bow and twist ........................................................................................................9
maL Properties
3.6etani ihtckenss
6.5
related to................................................................................................8
the copper foil bond ...............................................................9
4.6 Punching
woB t dnawist
........................................................................................................9
6.6
and machining
........................................................................................10
5.6
Preporseit
reht
ot
detale
creppo fdnob lio ...............................................................9
6.7 Dimensional stability ..............................................................................................10
6.6 Sheet
nuPcdna

gnih
machninig ........................................................................................01
6.8
sizes
............................................................................................................11
miD
7.6snelanoi
stilibaty
..............................................................................................01
6.9 Cut panels .............................................................................................................11
teehS 8.6 sizes
............................................................................................................11
7 Non-electrical
properties
of the base material after complete removal of
the
copper
foil
.................................................................................................................12
tuC 9.6 slenap .............................................................................................................11
7 7.1
-noNcelertcirp
lareposeit
fo sab ehtm
eretaifa
laret
cmor etelpmefo lavo
Appearance
of the dielectric
base

material
.............................................................12
eht
creppo
foil
.................................................................................................................21
7.2 Flexural strength ....................................................................................................13

8
Q

1.7 Flammability
aeppArnacfo ..........................................................................................................13
e eleid ehtctrci abse metarial .............................................................21
7.3
xelF Water
2.7rula
strtgneh ....................................................................................................31
7.4
absorption
...................................................................................................14
3.7
Flammytiliba
..........................................................................................................31
7.5 Measling ................................................................................................................14
W 4.7aret
basornoitp
...................................................................................................41
7.6
Glass transition

temperature
and cure factor ..........................................................14
aeM 5.7snilg
................................................................................................................41
Quality
assurance
...........................................................................................................15
6.7
Glass
trnaset
e cure facotr ..........................................................41
8.1 Quality systemnoitimeprutardna
.......................................................................................................15
8ytilau
assurnace ...........................................................................................................51
8.2
Responsibility
for inspection...................................................................................15

Q 1.8ytilau
sysmet
.......................................................................................................51
8.3
Qualification
inspection
..........................................................................................15
2.8
eRsnopsytilibi
for
nisepcoitn...................................................................................51

8.4 Quality conformance inspection..............................................................................15
Q 3.8filaucinoita
..........................................................................................51
8.5
Certificate of nisepcoitn
conformance
.....................................................................................15
4.8 Safety
Qytilaudata
cnoformnacni
esepc.............................................................................noit.51
8.6
sheet ...................................................................................................15
5.8
eCritficfo
eta
cnoformnace
.....................................................................................51
9 Packaging and marking...................................................................................................16
6.8 aSfeyt
atad seeht
...................................................................................................51
10 Ordering
information
.......................................................................................................16
9 aPckdna gniga marknig...................................................................................................61
01 Oredrgni niformnoita .......................................................................................................61
Annex A (informative) Engineering information .....................................................................17
Annex B (informative) Common laminate constructions.........................................................19
xennA A (inform)evita eenignErni gniformnoita .....................................................................71

Annex C (informative) Guideline for qualification and conformance inspection.......................21
xennA B (inform)evita oCmmal nomietan cnostrucnoits.........................................................91
Annex ZA (normative) Normative references to international publications with their
xennA C (inform)evita Genilediu fro ilauqficdna noita cnoformnacni esepcoitn.......................12
corresponding..........................................................................................................................22
European publications ................................................................................................... 22
goilbiBryhpa
Bibliography ..........................................................................................................................23
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Page 4

EN 61249−2−21:2003
61249-2-21 ” IEC:2003

–5–

Table 1 – Electrical properties requirements ..........................................................................6
Table 2 – Nominal thickness and tolerance of metal-clad laminate .........................................8
Table 3 – Bow and twist.........................................................................................................9
Table 4 – Pull-off and peel strength .......................................................................................10
Table 5 – Dimensional stability ..............................................................................................11
--```,,,-`-`,,`,,`,`,,`---


Table 6 – Size tolerance for cut panels ..................................................................................11
Table 7 – Rectangularity of cut panels ...................................................................................12
Table 8 – Flexural strength ....................................................................................................13
Table 9 – Flammability ..........................................................................................................13
Table 10 – Water absorption .................................................................................................14
Table 11 – Measling ..............................................................................................................14
Table 12 – Glass transition temperature and cure factor ........................................................14

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Page 5

EN 61249−2−21:2003
61249-2-21 ” IEC:2003

– 13 –

0$7(5,$/6)2535,17('%2$5'6
$1'27+(5,17(5&211(&7,1*6758&785(6±

3DUW5HLQIRUFHGEDVHPDWHULDOVFODGDQGXQFODG±
1RQKDORJHQDWHGHSR[LGHZRYHQ(JODVVUHLQIRUFHGODPLQDWHGVKHHWVRI
GHILQHGIODPPDELOLW\YHUWLFDOEXUQLQJWHVW
FRSSHUFODG




 6FRSH

--```,,,-`-`,,`,,`,`,,`---

This part of IEC 61249 gives requirements for properties of non-halogenated epoxide woven Eglass reinforced laminated sheets of defined flammability (vertical burning test), copper-clad
in thicknesses 0,05 mm up to 3,2 mm. The flammability rating is achieved through the use of
non-halogenated inorganic and/or organic compounds acting as fire retardants. These fire
retardants are contained as part of the polymeric structure or in addition to it. The glass
transition temperature is defined to be 120 °C minimum.
Some property requirements may have several classes of performance. The class desired
must be specified on the purchase order, otherwise the default class of material may be
supplied.

 1RUPDWLYHUHIHUHQFHV
The following referenced documents are indispensable for the application of this document. For
dated references, only the edition cited applies. For undated references, the latest edition of
the referenced document (including any amendments) applies.
IEC 61189-2:1997, 7HVW PHWKRGV IRU HOHFWULFDO PDWHULDOV LQWHUFRQQHFWLRQ VWUXFWXUHV DQG
DVVHPEOLHV±3DUW7HVWPHWKRGIRULQWHUFRQQHFWLRQ sWUXFWXUHV
IEC 61249-5-1:1995, 0DWHULDOV IRU LQWHUFRQQHFWLRQ VWUXFWXUHV ± 3DUW  6HFWLRQDO VSHFLILFDWLRQ
VHW IRU FRQGXFWLYH IRLOV DQG ILOPV ZLWK RU ZLWKRXW FRDWLQJV ± 6HFWLRQ  &RSSHU IRLO IRU WKH
PDQXIDFWXUHRIFRSSHUFODGEDVHPDWHULDOV

ISO 9000:2000, 4XDOLW\PDQDJHPHQWV\VWHPV±)XQGDPHQWDOVDQGYRFDEXODU\
ISO 11014-1:1994, 6DIHW\ GDWD VKHHW IRU FKHPLFDO SURGXFWV ± 3DUW  &RQWHQW DQG RUGHU
RIVHFWLRQV
ISO 14001:1996, (QYLURQPHQWDOPDQDJHPHQWV\VWHPV±6SHFLILFDWLRQZLWKJXLGDQFHIRUXVH


 0DWHULDOVDQGFRQVWUXFWLRQ
The sheet consists of an insulating base with metal-foil bonded to one side or both.

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Page 6

EN 61249−2−21:2003
61249-2-21 ” IEC:2003


– 15 –

5HVLQV\VWHP

Non-halogenated epoxide with a glass transition temperature of 120 °C minimum. The
maximum total halogens contained in the resin plus reinforcement matrix is 1 500 ppm with a
maximum chlorine of 900 ppm and maximum bromine being 900 ppm.
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 of7.3.


5HLQIRUFHPHQW


Woven E-glass as specified in IEC 61249-6-3, woven E-glass fabric (for the manufacture of
prepreg and copper clad materials).


0HWDOIRLO

Copper as specified in IEC 61249-5-1, copper foil (for the manufacture of copper-clad
materials). The preferred foils are electro-deposited of defined ductility.

 ,QWHUQDOPDUNLQJ
Not specified.

 (OHFWULFDOSURSHUWLHV
The requirements for the electrical properties are shown in Table 1.
7DEOH±(OHFWULFDOSURSHUWLHVUHTXLUHPHQWV

,(&


5HTXLUHPHQW

Resistance of foil

2E12

As specified in
IEC 61249-5-1

Surface resistance after damp heat while in the humidity
chamber (optional)


2E03

t 10 000 M:

Surface resistance after damp heat and recovery

2E03

t 50 000 M:

Volume resistivity after damp heat while in the humidity
chamber (optional)

2E04

t 5 000 M: m

Volume resistivity after damp heat and recovery

2E04

t 10 000 M: m

Relative permittivity after damp heat and recovery at 1 MHz

2E10

d 5,4


Dissipation factor after damp heat and recovery at 1 MHz

2E10

d 0,035

Electric strength (only for material thicknesses <0,5 mm )

2E11

t 30 kV/mm

Arc resistance

2E14

t 60 s

Dielectric breakdown (only for material thicknesses t 0,5 mm)

2E15

t 40 kV

Surface resistance at 125 °C

2E07

t 1 000 M:


Volume resistivity at 125 °C

2E07

t 1 000 M: m

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--```,,,-`-`,,`,,`,`,,`---

7HVWPHWKRG

3URSHUW\


Page 7

EN 61249−2−21:2003
61249-2-21 ” IEC:2003

– 17 –

 1RQHOHFWULFDOSURSHUWLHVRIWKHFRSSHUFODGODPLQDWH


$SSHDUDQFHRIWKHFRSSHUFODGVKHHW


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.
For the following specific defects the requirements given shall apply when inspection is made
in accordance with IEC 61189-2, Method 2M18.


,QGHQWDWLRQVSLWVDQGGHQWV


The size of an indentation, usually the length, shall be determined and given a point value to be
used as measure of the quality.
6L]H

3RLQWYDOXHIRUHDFKLQGHQWDWLRQ

mm
0,13 – 0,25

1

0,26 – 0,50

2

0,51 – 0,75

4

0,76 – 1,00


7

Over 1,00

30

The total point count for any 300 mm u 300 mm area shall be calculated to determine the
indentation class of the material.
Indentation Class A

29 maximum total point count

Indentation Class B

17 maximum total point count

Indentation Class C

5 maximum total point count

Indentation Class D

0 total point count

Indentation Class X

to be agreed upon by user and supplier

The required indentation class of material shall be specified in the purchase order. Indentation

Class A applies unless otherwise specified.


:ULQNOHV

There shall be no wrinkles in the copper surface.


6FUDWFKHV

Scratches deeper than 10 Pm 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 Pm 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 u 300 mm area.


5DLVHGDUHDV

Raised areas are usually impressions caused by defects in the press plates used during
manufacture but may also be caused by blisters or inclusions of foreign particles under the foil.

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Page 8

EN 61249−2−21:2003
61249-2-21 ” IEC:2003

– 19 –

Raised areas caused by blisters or inclusions are not permitted.
Raised areas caused by impressions of defects in press plates are permitted to the following
extent:
Indentation Class A and X material

Maximum height 15 Pm and maximum length 15 mm

Indentation Class B and C material

Maximum height 8 Pm and maximum length 15 mm

Indentation Class D material

Maximum height 5 Pm and maximum length 15 mm.



6XUIDFHZDYLQHVV

When examined in accordance with test method 2M12 of IEC 61189-2, the surface waviness in
both the machine and cross machine direction shall not exceed 7 Pm.

 $SSHDUDQFHRIWKHXQFODGIDFH
The unclad face of single-sided clad sheets 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.


/DPLQDWHWKLFNQHVV

The laminate thickness may be ordered to include or exclude the copper foil contribution as
specified in the purchase order. As a general rule laminates less than 0,8 mm are measured
excluding copper and laminates greater or equal to 0,8 mm are measured including copper. If
the copper-clad laminate is tested in accordance with test method 2D01 of IEC 61189-2, the
thickness shall not depart from the nominal thickness by more than the appropriate value
shown in Table 2. The fine tolerances shall apply unless the other tolerances are ordered.
7DEOH±1RPLQDOWKLFNQHVVDQGWROHUDQFHRIPHWDOFODGODPLQDWH
1RPLQDOWKLFNQHVV

1RPLQDOWKLFNQHVV

H[FOXGLQJPHWDOIRLO

LQFOXGLQJPHWDOIRLO

PDWHULDOLQWHQGHGIRU

PDWHULDOLQWHQGHGIRUVLQJOHRU

PXOWLOD\HUERDUGV



GRXEOHVLGHGERDUGV


7ROHUDQFHUHTXLUHPHQW

r mm 

&RDUVH

)LQH

([WUDILQH

t 0,05 d 0,10

0,03

0,02

0,01

>0,10

d 0,15

0,04

0,03


0,02

>0,15

d 0,30

0,05

0,04

0,03

>0,30

d 0,50

0,08

0,05

0,04

>0,50

d 0,80

0,09

0,06


0,05

>0,80

d 1,00

t 0,80 d 1,00

0,13

0,09

0,07

d 1,30

>1,00

d 1,30

0,17

0,11

0,08

>1,30

d 1,70


0,20

0,13

0,10

>1,70

d 2,10

0,23

0,15

0,12

>2,10

d 2,60

0,25

0,18

0,15

>2,60

d 3,20


0,30

0,20

0,15

mm

>1,00

mm

--```,,,-`-`,,`,,`,`,,`---

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Page 9

EN 61249−2−21:2003
61249-2-21 ” IEC:2003

– 21 –

The thicknesses and tolerances do not apply to the outer 25 mm of the trimmed 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.


%RZDQGWZLVW

When the copper-clad laminate is tested in accordance with test method 2M01of IEC 61189-2,
the bow and twist shall not exceed the values given in Table 3.
7DEOH±%RZDQGWZLVW
5HTXLUHPHQW

3URSHUW\

Bow and
twist

7HVWPHWKRG
,(&


2M01

1RPLQDO

3DQHOGLPHQVLRQ

WKLFNQHVV

ORQJHVWVLGH


mm 

mm 

t 0,8 d 1,3

&RSSHUIRLORQ

&RSSHUIRLORQ

RQHVLGH

ERWKVLGHV

d 2,0

d 1,5

d 1,8

d 1,3

>500

d 1,5

d 1,0

d 350


d 1,5

d 1,0

d 1,3

d 0,8

>500

d 1,0

d 0,5

d 350

d 1,0

d 0,5

d 0,8

d 0,4

d 0,5

d 0,3

d 350
>350


>1,3

d 1,7

>350

>1,7

d 3,2

%

>350

d 500

d 500

d 500

>500

NOTE The requirements for bow and twist apply only to one sided copper-clad laminates with maximum foil
thickness of 105 P m (915 g/m 2 ) and double sided copper-clad laminates with maximum foil thickness difference of
70 P m (610 g/m 2 ).
Requirements for laminates with copper foil configurations beyond these limits are subject to agreement between
purchaser and supplier.




3URSHUWLHVUHODWHGWRWKHFRSSHUIRLOERQG

Pull-off and peel strength requirements are shown in Table 4. These requirements apply to
copper foil with a normal profile depth. In the case of low or very low profile copper foil, the
requirements shall be at least 50 % of that shown in Table 4 as a minimum.

--```,,,-`-`,,`,,`,`,,`---

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Page 10

EN 61249−2−21:2003
61249-2-21 ” IEC:2003

– 23 –
7DEOH±3XOORIIDQGSHHOVWUHQJWK

3URSHUW\

7HVWPHWKRG

5HTXLUHPHQW


,(&


Pull-off strength

t 25 N

2M05

Thickness of the copper foil

d 12 P m

Peel strength after heat
shock of 20 s

2M14

Peel strength after dry
heat 125 °C

2M15

Peel strength after
exposure to solvent
vapour. Solvents as
agreed upon between
purchaser and supplier

2M06


Peel strength after
simulated plating

2M16

Peel strength at high
temperature

2M17

35 P m
2

t 70 P m
2

( d 101 g/m )

(152 g/m )

(305 g/m )

( t 610 g/m 2 )

t 0,8 N/mm

t 1,0 N/mm

t 1,4 N/mm


t 1,8 N/mm

No blistering or delamination

t 0,8 N/mm

t 1,0 N/mm

t 1,4 N/mm

t 1,8 N/mm

No blistering or delamination

t 0,8 N/mm

t 1,0 N/mm

t 1,4 N/mm

t 1,8 N/mm

No blistering or delamination

t 0,7 N/mm

t 0,9 N/mm

t 1,1 N/mm


t 1,4 N/mm

No blistering or delamination

Not specified

Temperature 125 °C
(optional)
Blistering after 20 s heat
shock

18 P m
2

2C05

t 0,7 N/mm

t 0,9 N/mm

t 1,1 N/mm

No blistering or delamination

NOTE 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.





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Punching is not applicable. The laminate shall, in accordance with the manufacturer’s
recommendations, be capable of being 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.


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When specimens are tested in accordance to IEC 61189-2, Method 2X02, the observed
tolerance shall be as specified in Table 5. The nominal dimensional stability value shall be as
agreed upon between user and vendor. The tolerance range around the agreed upon nominal
shall be Class A, unless otherwise specified on the purchase order.
The choice of the glass fabrics in the construction of the laminate has a significant impact on
dimensional stability. Examples of typical constructions used in printed board applications can
be found in Annex B. Annex B is not a construction requirement table but is presented for
engineering information only.
Class A performance shall apply, unless otherwise noted on the purchase order.

--```,,,-`-`,,`,,`,`,,`---

Copyright British Standards Institution
Reproduced by IHS under license with BSI
No reproduction or networking permitted without license from IHS

Not for Resale



Page 11

EN 61249−2−21:2003
61249-2-21 ” IEC:2003

– 25 –
7DEOH±'LPHQVLRQDOVWDELOLW\
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Dimensional stability



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2X02

ppm 

A


r 300

B

r 200

C

r 100

X

As agreed upon between
user and supplier

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Sheet sizes are matters of agreement between purchaser and supplier. However the
recommended sizes are listed below:
915 mm u 1 220 mm
1 065 mm u 1 155 mm
1 065 mm u 1 280 mm
1 000 mm u 1 000 mm
1 000 mm u 1 200 mm.



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The size of sheet delivered by the supplier shall not deviate more than

 20
0

mm from the

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ordered size.



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Cut panel sizes, when delivered, shall be in accordance with the purchaser’s specification.


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For panels cut to size according to the purchaser’s specification, the following tolerances for
length and width shall apply as shown in Table 6. Tolerances indicated as normal shall apply,
unless otherwise specified in the purchasing specification.
7DEOH±6L]HWROHUDQFHIRUFXWSDQHOV
7ROHUDQFH

r mm 


3DQHOVL]H

mm 
1RUPDO

NOTE

Copyright British Standards Institution
Reproduced by IHS under license with BSI
No reproduction or networking permitted without license from IHS

&ORVH

d 300

2,0

0,5

! 300 d 600

2,0

0,8

! 600

2,0


1,6

The specified tolerances include all deviations caused by cutting the panels.

Not for Resale


Page 12

EN 61249−2−21:2003
61249-2-21 ” IEC:2003


– 27 –

5HFWDQJXODULW\RIFXWSDQHOV

For panels cut to size according to the purchaser’s specification, the following requirements for
rectangularity shall apply as shown in Table 7. Tolerance indicated as normal shall apply,
unless otherwise specified in the purchasing specification.
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Rectangularity of cut panels

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mm/m 


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&ORVH

d3

d2

2M23





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DIWHUFRPSOHWHUHPRYDORIWKHFRSSHUIRLO



$SSHDUDQFHRIWKHGLHOHFWULFEDVHPDWHULDO

The etched specimens shall be inspected to verify that no surface or subsurface imperfections
of the dielectric material exceed those shown below. The specimens shall be inspected using
an optical aid apparatus which provides a minimum magnification of 4u.
Referee inspection shall be conducted at 10u magnification. Lighting conditions of inspection
shall be appropriate to the material under inspection or as agreed upon between user and
supplier.


x

the reinforcement fibres are not cut or exposed;

x

the foreign inclusions are not conductive;

x

the imperfections do not propagate as a result of thermal stress;

x

the foreign inclusions are translucent;

x

opaque foreign fibres are less than 15 mm in length and average no more than one per
300 mm u 300 mm area;

x

opaque foreign inclusions other than fibres shall not exceed 0,50 mm. Opaque foreign
inclusions less than 0,15 mm shall not be counted. Opaque foreign inclusions between
0,50 mm and 0,15 mm shall average no more than two spots per 300 mm u 300 mm area;

x

voids (sealed voids or surface void) have their longest dimension less than 0,075 mm and

there should not be more than three voids in a 3,5 mm diameter circle.

Copyright British Standards Institution
Reproduced by IHS under license with BSI
No reproduction or networking permitted without license from IHS

Not for Resale

--```,,,-`-`,,`,,`,`,,`---

Surface and subsurface imperfections (such as weave texture, resin starvation, voids, foreign
inclusions) shall be acceptable, provided that the imperfections meet the following:


Page 13

EN 61249−2−21:2003
61249-2-21 ” IEC:2003


– 29 –

)OH[XUDOVWUHQJWK

When the laminate is tested in accordance with test method 2M20 of IEC 61189-2, the flexural
strength shall be as shown in Table 8.
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