oSIST prEN IEC 61249-2-52:2024

Materials for printed boards and other interconnecting structures - Part 2-52: Reinforced base materials clad and unclad - Thermosetting hydrocarbon resin system, woven e-glass reinforced laminate sheets of defined flammability (vertical burning test), copper-clad

IEC 61249-2-52:2025 gives requirements for properties of the thermosetting hydrocarbon resin system, woven E-glass reinforced laminate sheets of defined flammability (vertical burning test), copper-clad in thicknesses of 0,05 mm up to 3,20 mm.

Werkstoffe für Leiterplatten und andere Verbindungsstrukturen – Teil 2-52: Kaschierte und unkaschierte verstärkte Basismaterialien – Duroplastisches Kohlenwasserstoffharzsystem, E-Glasgewebe verstärkte Laminattafeln mit definierter Brennbarkeit (Brennprüfung mit vertikaler Prüflingslage), kupferkaschiert

Matériaux pour circuits imprimés et autres structures d’interconnexion - Partie 2-52: Matériaux de base renforcés, métallisés et non métallisés - Feuilles stratifiées renforcées en tissu de verre de type e avec système de résines hydrocarbonées thermodurcissables, d’inflammabilité définie (essai de combustion verticale), plaquées cuivre

L’IEC 61249-2-52:2025 fournit les exigences relatives aux propriétés des feuilles stratifiées renforcées en tissu de verre de type E avec système de résines d'hydrocarbure thermodurcissables, d’inflammabilité définie (essai de combustion verticale), plaquées cuivre en épaisseurs de 0,05 mm à 3,20 mm.

Materiali za plošče tiskanih vezij in druge povezovalne strukture - 2-52. del: Pokovinjeni in nepokovinjeni ojačeni osnovni materiali - Duromeri na osnovi ogljikovodikov, laminati, ojačeni s tkanino iz e-stekla z definirano vnetljivostjo (preskus navpične gorljivosti), bakrena obloga

General Information

• Status: Not Published
• Public Enquiry End Date: 31-Dec-2024
• ICS: 31.180 - Printed circuits and boards
• Technical Committee: ITIV - Electronics assembly technology and Environmental standardization
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 16-Oct-2024
• Due Date: 05-Mar-2025
• Completion Date: 10-Dec-2024
• Ref Project: prEN IEC 61249-2-52:2024 - Materials for printed boards and other interconnecting structures - Part 2-52: Reinforced base materials clad and unclad - Thermosetting hydrocarbon resin system, woven E-glass reinforced laminate sheets of defined flammability (vertical burning test), copper-clad

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2024
Materiali za plošče tiskanih vezij in druge povezovalne strukture - 2-52. del:
Pokovinjeni in nepokovinjeni ojačeni osnovni materiali - Duromeri na osnovi
ogljikovodikov, laminati, ojačeni s tkanino iz e-stekla z definirano gorljivostjo
(preskus navpične gorljivosti), bakrena obloga
Materials for printed boards and other interconnecting structures - Part 2-52: Reinforced
base materials clad and unclad - Thermosetting hydrocarbon resin system, woven e-
glass reinforced laminate sheets of defined flammability (vertical burning test), copper-
clad
Ta slovenski standard je istoveten z: prEN IEC 61249-2-52:2024
ICS:
31.180 Tiskana vezja (TIV) in tiskane Printed circuits and boards
plošče
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

91/1977/CDV
COMMITTEE DRAFT FOR VOTE (CDV)

PROJECT NUMBER:
IEC 61249-2-52 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-10-11 2025-01-03
SUPERSEDES DOCUMENTS:
91/1905/CD, 91/1974/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 2-52: Reinforced base
materials clad and unclad - Thermosetting hydrocarbon resin system, woven E-glass reinforced
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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IEC CDV 61249-2-52 © IEC 2024 – 2 – 91/1977/CDV
1 CONTENTS
3 FOREWORD . 4
4 1 Scope . 6
5 2 Normative references . 6
6 3 Terms and definitions . 6
7 4 Materials and Construction . 6
8 4.1 General . 6
9 4.2 Resin system . 6
10 4.3 Metal foil . 6
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 . 8
19 7.1.4 Scratches . 8
20 7.1.5 Raised areas . 8
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 . 9
25 7.5 Properties related to the copper foil bond . 10
26 7.6 Thermal stress . 10
27 7.7 Solderability . 10
28 7.8 Punching and machining . 10
29 7.9 Dimensional stability . 11
30 7.10 Sheet sizes . 11
31 7.10.1 Typical sheet sizes . 11
32 7.10.2 Tolerances for sheet sizes . 11
33 7.11 Cut panels . 11
34 7.11.1 Cut panel sizes . 11
35 7.11.2 Size tolerances for cut panels . 11
36 7.11.3 Rectangularity of cut panels . 11
37 8 Non-electrical properties of the base material after complete removal of the
38 copper foil . 12
39 8.1 Appearance of the dielectric base material . 12
40 8.2 Flexural strength . 12
41 8.3 Flammability . 13
42 8.4 Water absorption. 13
43 8.5 Measling . 13
44 8.6 Glass transition temperature and cure factor . 14
45 8.7 Decomposition temperature . 14
46 8.8 Time to delamination (TMA) . 14
47 8.9 Z-axis expansion . 14

IEC CDV 61249-2-52 © IEC 2024 – 3 – 91/1977/CDV
48 8.10 X/Y-axis expansion . 14
49 8.11 Thermal conductivity . 14
50 9 Quality assurance . 14
51 9.1 Quality system . 14
52 9.2 Responsibility for inspection . 14
53 9.3 Qualification inspection . 15
54 9.3.1 General . 15
55 9.3.2 Sampling plan . 15
56 9.3.3 Frequency . 15
57 9.3.4 Judgment Rules . 16
58 9.4 Quality conformance inspection . 16
59 9.4.1 General . 16
60 9.4.2 Inspection lot . 16
61 9.4.3 Test of Group A . 16
62 9.4.4 Test of Group B . 16
63 9.4.5 Test of Group C . 16
64 9.4.6 Judgment Rules . 16
65 9.4.7 Rejected lots . 16
66 9.5 Certificate of conformance . 16
67 9.6 Safety data sheet . 17
68 10 Packaging and marking . 17
69 11 Ordering information . 17
70 Annex A (informative) Common laminate constructions . 18
71 Bibliography . 19
73 Table 1 – Electrical properties. 7
74 Table 2 – Indentations . 8
75 Table 3 –Nominal thickness and tolerance of metal-clad laminate . 9
76 Table 4 –Bow and twist . 9
77 Table 5 – Peel strength . 10
78 Table 6 – Thermal stress . 10
79 Table 7 – Solderability . 10
80 Table 8 – Dimensional stability . 11
81 Table 9 – Size tolerance for cut panels . 11
82 Table 10 – Rectangularity of cut panels . 12
83 Table 11 – Flexural strength . 12
84 Table 12 – Flammability . 13
85 Table 13 – Water absorption . 13
86 Table 14 – Measling . 13
87 Table 15 – Decomposition temperature requirements . 14
88 Table 16 – Time to delamination requirements . 14
89 Table 17 – Z-axis expansion requirements . 14
90 Table 18 – X/Y-axis expansion requirements . 14
91 Table 19 – Qualification and conformance inspection . 15
92 Table A.1 – Thickness . 18

IEC CDV 61249-2-52
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