EN IEC 61249-2-53:2025
(Main)Materials for printed boards and other interconnecting structures - Part 2-53: Reinforced base materials clad and unclad - PTFE unfilled laminate sheets of defined flammability (vertical burning test), copper-clad
Materials for printed boards and other interconnecting structures - Part 2-53: Reinforced base materials clad and unclad - PTFE unfilled laminate sheets of defined flammability (vertical burning test), copper-clad
IEC 61249-2-53:2025 specifies requirements for properties of PTFE unfilled reinforced laminated sheet of a thickness 0,05 mm up to 10,0 mm of defined flammability (vertical burning test), copper-clad. This part of IEC 61249 is applicable to the design, manufacture, use of PTFE unfilled reinforced laminated sheet of defined flammability (vertical burning test), copper-clad. Its flame resistance is defined in terms of the flammability requirements of 8.4.
Werkstoffe für Leiterplatten und andere Verbindungsstrukturen - Teil 2-53: Kaschierte und unkaschierte verstärkte Basismaterialien - ungefüllte PTFE-Laminattafeln mit definierter Brennbarkeit (Brennprüfung mit vertikaler Prüflingslage), kupferkaschiert
Matériaux pour circuits imprimés et autres structures d’interconnexion - Partie 2-53: Matériaux de base renforcés, métallisés et non métallisés - Feuilles stratifiées non chargées en PTFE d’inflammabilité définie (essai de combustion verticale), plaquées cuivre
L'IEC 61249-2-53:2025 fournit les exigences relatives aux propriétés des feuilles stratifiées renforcées non chargées en PTFE d'une épaisseur comprise entre 0,05 mm et 10,0 mm, d'inflammabilité définie (essai de combustion verticale), plaquées cuivre. La présente partie de l'IEC 61249 s'applique à la conception, à la fabrication et à l'utilisation des feuilles stratifiées renforcées non chargées en PTFE d'inflammabilité définie (essai de combustion verticale), plaquées cuivre. Sa résistance à la flamme est définie en fonction des exigences d'inflammabilité de 8.4.
Materiali za plošče tiskanih vezij in druge povezovalne strukture - 2-53. del: Pokovinjeni in nepokovinjeni ojačeni osnovni materiali, bakrena obloga
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN IEC 61249-2-53:2024
01-december-2024
Materiali za plošče tiskanih vezij in druge povezovalne strukture - 2-53. del:
Pokovinjeni in nepokovinjeni ojačeni osnovni materiali
Materials for printed boards and other interconnecting structures - Part 2-53: Reinforced
base materials clad and unclad - PTFE unfilled laminate sheets of defined flammability
(vertical burning test), copper-clad
Matériaux pour circuits imprimés et autres structures d’interconnexion - Partie 2-53:
Matériaux de base renforcés, métallisés et non métallisés - Feuilles stratifiées non
chargées en PTFE d’inflammabilité définie (essai de combustion verticale), plaquées
cuivre
Ta slovenski standard je istoveten z: prEN IEC 61249-2-53:2024
ICS:
31.180 Tiskana vezja (TIV) in tiskane Printed circuits and boards
plošče
oSIST prEN IEC 61249-2-53:2024 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN IEC 61249-2-53:2024
oSIST prEN IEC 61249-2-53:2024
91/1978/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61249-2-53 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-10-11 2025-01-03
SUPERSEDES DOCUMENTS:
91/1913/CD, 91/1975/CC
IEC TC 91 : ELECTRONICS ASSEMBLY TECHNOLOGY
SECRETARIAT: SECRETARY:
Japan Mr Osamu IKEDA
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the
final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Materials for printed boards and other interconnecting structures - Part 2-53: Reinforced base
materials clad and unclad - PTFE unfilled laminate sheets of defined flammability (vertical
burning test), copper-clad
PROPOSED STABILITY DATE: 2031
NOTE FROM TC/SC OFFICERS:
download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National
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oSIST prEN IEC 61249-2-53:2024
IEC CDV 61249-2-53 © IEC 2024 – 2 – 91/1978/CDV
1 CONTENTS
3 FOREWORD . 4
4 1 Scope . 6
5 2 Normative references . 6
6 3 Terms and definitions . 7
7 4 Construction and Materials . 7
8 4.1 Construction . 7
9 4.2 Resin system . 7
10 4.3 Metal foil . 7
11 4.4 Reinforcement . 7
12 5 Internal marking . 7
13 6 Electrical properties . 7
14 7 Non-electrical properties of the copper-clad laminate . 8
15 7.1 Appearance of the copper-clad sheet . 8
16 7.1.1 General . 8
17 7.1.2 Indentations (pits and dents) . 8
18 7.1.3 Wrinkles . 9
19 7.1.4 Scratches . 9
20 7.1.5 Raised areas . 9
21 7.1.6 Surface waviness . 9
22 7.2 Appearance of the unclad face . 9
23 7.3 Laminate thickness . 9
24 7.4 Bow and twist . 10
25 7.5 Properties related to the copper foil bond . 10
26 7.6 Heat shock . 10
27 7.7 Machining . 11
28 7.8 Dimensional stability . 11
29 7.9 Sheet sizes and tolerances . 11
30 7.9.1 Typical sheet sizes . 11
31 7.9.2 Tolerances for sheet sizes . 11
32 7.10 Cut panels size, tolerances and rectangularity . 11
33 7.10.1 Cut panel sizes . 11
34 7.10.2 Size tolerances for cut panels . 11
35 7.10.3 Rectangularity of cut panels . 12
36 8 Non-electrical properties of the base material after complete removal of the
37 copper foil . 12
38 8.1 Appearance of the dielectric base material . 12
39 8.2 Flexural strength . 12
40 8.3 Flammability . 12
41 8.4 Water absorption . 13
42 8.5 Glass transition temperature and cure factor . 13
43 8.6 Decomposition temperature . 13
44 8.7 Time to delamination (TMA) . 13
45 8.8 Z-axis expansion . 13
46 8.9 X/Y-axis expansion . 14
47 8.10 Thermal Conductivity . 14
oSIST prEN IEC 61249-2-53:2024
IEC CDV 61249-2-53 © IEC 2024 – 3 – 91/1978/CDV
48 9 Quality assurance . 14
49 9.1 Quality system . 14
50 9.2 Responsibility for inspection . 14
51 9.3 Qualification inspection . 14
52 9.3.1 General . 14
53 9.3.2 Samples . 14
54 9.3.3 Frequency . 14
55 9.3.4 Criterion Rule . 15
56 9.4 Quality Conformance inspection . 15
57 9.4.1 General . 15
58 9.4.2 Inspection lot . 15
59 9.4.3 Group A inspection . 15
60 9.4.4 Group B inspection . 16
61 9.4.5 Group C inspection . 16
62 9.4.6 Criterion Rule . 16
63 9.4.7 Rejected lots . 16
64 9.5 Certificate of conformance . 16
65 9.6 Safety data sheet . 16
66 10 Packaging and marking . 16
67 11 Ordering information . 16
68 Annex A (informative) Engineering information . 18
69 A.1 General . 18
70 A.2 Electrical properties . 18
71 A.3 Non-electrical properties of the base material after complete removal of the
72 copper foil . 18
73 Bibliography . 19
75 Table 1 – Electrical properties . 7
76 Table 2 – Indentations . 8
77 Table 3 – Nominal thickness and tolerance of metal-clad laminate . 9
78 Table 4 – Bow and twist requirements . 10
79 Table 5 – Peel strength requirements . 10
80 Table 6 – Heat shock requirements . 10
81 Table 7 – Dimensional stability . 11
82 Table 8 – Size tolerances for cut panels . 11
83 Table 9 – Rectangularity of cut panels . 12
84 Table 10 – Flammability requirements . 13
85 Table 11 – Water absorption requirements . 13
86 Table 12 – Decomposition temperature requirements . 13
87 Table 13 – Time to delamination requirements . 13
88 Table 14 – Z-axis expansion requirements . 14
89 Table 15 – X/Y-axis expansion requirements . 14
90 Table 16 – Qualification and conformance inspection . 14
oSIST prEN IEC 61249-2-53:2024
IEC CDV 61249-2-53 © IEC 2024 – 4 – 91/1978/CDV
93 INTERNATIONAL ELECTROTECHNICAL COMMISSION
94 ____________
96 MATERIALS FOR PRINTED BOARDS AND OTHER INTERCONNECTING
97 STRUCTURES –
99 Part 2-53: Reinforced base materials clad and unclad – PTFE unfilled
100 laminate sheets of defined flammability (vertical burning test), copper-
101 clad
105 FOREWORD
106 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
107 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
108 international co-operation on all questions concerning standardization in the electrical and electronic fields. To
109 this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
110 Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
111 Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
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114 with the International Organization for Standardization (ISO) in accordance with conditions determined by
115 agreement between the two organizations.
116 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
117 consensus of opinion on the relevant subjects since each technical committee has representation from all
118 interested IEC National Committees.
119 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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123 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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127 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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130 6) All users should ensure that they have the latest edition of this publication.
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135 Publications.
136 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
137 indispensable for the correct application of this publication.
138 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
139 patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
140 International Standard IEC 61249-2-53 has been prepared by IEC technical committee 91,
141 Electronics assembly technology.
142 The text of this International Standard is based on the following documents:
FDIS Report on voting
XX/XX/FDIS XX/XX/RVD
144 Full information on the voting for the approval of this International Standard can be found in
145 the report on voting indicated in the above table.
oSIST prEN IEC 61249-2-53:2024
IEC CDV 61249-2-53 © IEC 2024 – 5 – 91/1978/CDV
146 This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
147 The committee has decided that the contents of this document will remain unchanged until the
148 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
149 the specific document. At this date, the document will be
150 • reconfirmed,
151 • withdrawn,
152 • replaced by a revised edition, or
153 • amended.
155 The National Committees are requested to note that for this document the stability date
156 is 2031.
157 THIS TEXT IS INCLUDED FOR THE INFORMATION OF THE NATIONAL COMMITTEES AND WILL BE
158 DELETED AT THE PUBLICATION STAGE.
oSIST prEN IEC 61249-2-53:2024
IEC CDV 61249-2-53 © IEC 2024 – 6 – 91/1978/CDV
161 MATERIALS FOR PRINTED BOARDS AND OTHER INTERCONNECTING
162 STRUCTURES –
164 Part 2-53: Reinforced base materials clad and unclad - PTFE unfilled
165 laminate sheets of defined flammability (vertical burning test), copper-
166 clad
170 1 Scope
171 This part of IEC 61249 specifies requirements for properties of PTFE unfilled reinforced
172 laminated sheet of a thickness 0,05 mm up to 10,0 mm, of defined flammability (vertical
173 burning test), copper-clad.
174 This part of IEC 61249 is applicable to the design, manufacture, use of PTFE unfilled
175 reinforced laminated sheet of defined flammability (vertical burning test), copper-clad.
176 Its flame resistance is defined in terms of the flammability requirements of 8.3.
177 2 Normative references
178 The following documents are referred to in the text in such a way that some or all of their
179 content constitutes requirements of this document. For dated references, only the edition
180 cited applies. For undated references, the latest edition of the referenced document (including
181 any amendments) applies.
182 IEC 61189-2:2006, Test methods for electrical materials, printed boards and other
183 interconnection structures and assemblies – Part 2: Test methods for materials for
184 interconnection structures
185 IEC 61189-2-721:2015, Test methods for electrical materials, printed board and other
186 interconnection structures and assemblies - Part 2-721: Test methods for materials for
187 interconnection structures – Measurement of relative permittivity and loss tangent for copper
188 clad laminate at microwave frequency using split post dielectric resonator
189 IEC 61189-2-803:20XX, Test methods for electrical materials, printed board and other
190 interconnection structures and assemblies - Part 2-803: Test methods for materials for
191 interconnection structures - Test methods for Z-Axis Expansion of base materials and printed
192 board
193 IEC 61189-2-807:2021, Test methods for electrical materials, printed board and other
194 interconnection structures and assemblies - Part 2-807: Test methods for materials for
195 interconnection structures – Decomposition temperature (Td) using TGA
196 IEC 61189-2-809:20XX, Test methods for electrical materials, printed board and other
197 interconnection structures and assemblies – Part 2-809: Test methods for materials for
198 interconnection structures - X/Y Coefficient of Thermal Expansion Test (CTE) for Thick Base
199 Materials by TMA
200 IEC 61249-5-1, Materials for interconnection structures – Part 5: Sectional specification set
201 for conductive foils and films with or without coatings – Section 1: Copper foils (for the
202 manufacture of copper-clad base materials)
203 IEC PAS 61249-6-3:2011, Specification for finished fabric woven from "E" glass for printed
204 boards
205 ISO 11014:2009, Safety data sheet for chemical products – Content and order of sections
206 IPC TM-650 TM 2.5.5.5, Stripline Test for Permittivity and Loss Tangent (Dielectric Constant
207 and Dissipation Factor) at X-Band
oSIST prEN IEC 61249-2-53:2024
IEC CDV 61249-2-53 © IEC 2024 – 7 – 91/1978/CDV
208 3 Terms and definitions
209 No terms and definitions are listed in this document.
210 ISO and IEC maintain terminological databases for use in standardization at the following
211 addresses:
212 • IEC Electropedia: available at http://www.electropedia.org/
213 • ISO Online browsing platform: available at http://www.iso.org/obp
214 4 Construction and Materials
215 4.1 Construction
216 The sheet consists of an insulating base make of PTFE as the primary resin with metal-foil
217 bonded to one side or both.
218 4.2 Resin system
219 PTFE resin or modified PTFE as the primary resin, and have no filler.
220 4.3 Metal foil
221 Copper, as specified in IEC 61249-5-1, copper foil (for the manufacture of copper-clad
222 materials). The preferred foils are electrodeposited of defined ductility.
223 4.4 Reinforcement
224 Woven E-glass as specified in IEC/PAS 61249-6-3.
225 5 Internal marking
226 AABUS ( As agreed upon by user and supplier).
227 6 Electrical properties
228 The electrical properties requirements are shown in Table 1.
229 Table 1 – Electrical properties
Property Test method Units Requirement
Surface resistivity after damp
heat while in the humidity IEC 61189-2 2E04 MΩ ≥10 000
chamber
Volume resistivity after damp
MΩ·m
heat while in the humidity IEC 61189-2 2E04 ≥5 000
chamber
Surface resistivity after E-24/125
IEC 61189-2 2E04 MΩ ≥1 000
while in the chamber
Volume re
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