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.

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.

General Information

Status
Published
Publication Date
09-Oct-2025
Drafting Committee
Current Stage
PPUB - Publication issued
Start Date
10-Oct-2025
Completion Date
06-Nov-2025
Ref Project
Standard
IEC 61249-2-53:2025 - 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 Released:10. 10. 2025 Isbn:9782832707517
English language
19 pages
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Standard
IEC 61249-2-53:2025 - 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 Released:10. 10. 2025 Isbn:9782832707517
French language
20 pages
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Standard
IEC 61249-2-53:2025 - 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 Released:10. 10. 2025 Isbn:9782832707517
English and French language
39 pages
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Standards Content (Sample)


IEC 61249-2-53 ®
Edition 1.0 2025-10
INTERNATIONAL
STANDARD
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
ICS 31.180  ISBN 978-2-8327-0751-7

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or
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CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Construction and materials . 6
4.1 Construction . 6
4.2 Resin system . 6
4.3 Metal foil . 6
4.4 Reinforcement . 6
5 Internal marking . 6
6 Electrical properties . 6
7 Non-electrical properties of the copper-clad laminate . 7
7.1 Appearance of the copper-clad sheet . 7
7.1.1 General . 7
7.1.2 Indentations (pits and dents) . 7
7.1.3 Wrinkles . 8
7.1.4 Scratches . 8
7.1.5 Raised areas . 8
7.1.6 Surface waviness . 8
7.2 Appearance of the unclad face . 8
7.3 Laminate thickness . 8
7.4 Bow and twist . 9
7.5 Properties related to the copper foil bond . 10
7.6 Heat shock . 10
7.7 Machining . 10
7.8 Dimensional stability . 10
7.9 Sheet sizes and tolerances . 11
7.9.1 Typical sheet sizes . 11
7.9.2 Tolerances for sheet sizes . 11
7.10 Cut panels size, tolerances and rectangularity . 11
7.10.1 Cut panel sizes . 11
7.10.2 Size tolerances for cut panels . 11
7.10.3 Rectangularity of cut panels . 12
8 Non-electrical properties of the base material after complete removal of the
copper foil . 12
8.1 General . 12
8.2 Appearance of the dielectric base material . 12
8.3 Flexural strength . 12
8.4 Flammability . 13
8.5 Water absorption . 13
8.6 Glass transition temperature and cure factor . 13
8.7 Decomposition temperature . 13
8.8 Time to delamination (TMA) . 13
8.9 Z-axis expansion . 14
8.10 X/Y-axis expansion . 14
8.11 Thermal conductivity . 14
9 Quality assurance . 14
9.1 Quality system . 14
9.2 Responsibility for inspection . 14
9.3 Qualification inspection . 15
9.3.1 General . 15
9.3.2 Samples . 15
9.3.3 Frequency . 15
9.3.4 Criterion rule . 16
9.4 Quality conformance inspection . 16
9.4.1 General . 16
9.4.2 Inspection lot . 16
9.4.3 Group A inspection . 16
9.4.4 Group B inspection . 16
9.4.5 Group C inspection . 16
9.4.6 Criterion rule . 16
9.4.7 Rejected lots . 16
9.5 Certificate of conformance . 17
9.6 Safety data sheet . 17
10 Packaging and marking . 17
11 Ordering information . 17
Annex A (informative)  Engineering information . 18
A.1 General . 18
A.2 Electrical properties . 18
A.3 Non-electrical properties of the base material after complete removal of the
copper foil . 18
Bibliography . 19

Table 1 – Electrical properties . 6
Table 2 – Indentations . 7
Table 3 – Nominal thickness and tolerance of metal-clad laminate . 9
Table 4 – Bow and twist requirements . 9
Table 5 – Peel strength requirements . 10
Table 6 – Heat shock requirements . 10
Table 7 – Dimensional stability . 11
Table 8 – Size tolerances for cut panels . 11
Table 9 – Rectangularity of cut panels . 12
Table 10 – Flammability requirements . 13
Table 11 – Water absorption requirements . 13
Table 12 – Decomposition temperature requirements . 13
Table 13 – Time to delamination requirements . 14
Table 14 – Z-axis expansion requirements . 14
Table 15 – X/Y-axis expansion requirements . 14
Table 16 – Qualification and conformance inspection . 15

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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

FOREWORD
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IEC 61249-2-53 has been prepared by IEC technical committee 91: Electronics assembly
technology. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
91/1978/CDV 91/2044/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
A list of all parts in the IEC 61249 series, published under the general title Materials for printed
boards and other interconnecting structures, can be found on the IEC website.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
1 Scope
This part of IEC 61249 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.
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 61189-2-721:2015, Test methods for electrical materials, printed boards and other
interconnection structures and assemblies - Part 2-721: Test methods for materials for
interconnection structures - Measurement of relative permittivity and loss tangent for copper
clad laminate at microwave frequency using a split post dielectric resonator
IEC 61189-2-803:2023, Test methods for electrical materials, printed boards and other
interconnection structures and assemblies - Part 2-803: Test methods for Z-axis expansion of
base materials and printed boards
IEC 61189-2-807:2021, Test methods for electrical materials, printed boards and other
interconnection structures and assemblies - Part 2-807: Test methods for materials for
interconnection structures - Decomposition temperature (T ) using TGA
d
IEC 61189-2-809:2024, Test methods for electrical materials, printed board and other
interconnection structures and assemblies - Part 2-809: X/Y coefficient of thermal expansion
(CTE) test for thick base materials by TMA
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 61249-6-3:2023, Materials for printed boards and other interconnecting structures - Part 6-
3: Sectional specification set for reinforcement materials - Specification for finished fabric
woven from "E" glass for printed boards
ISO 11014:2009, Safety data sheet for chemical products - Content and order of sections
IPC TM-650 TM 2.5.5.5, Stripline Test for Permittivity and Loss Tangent (Dielectric Constant
and Dissipation Factor) at X-Band
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
4 Construction and materials
4.1 Construction
The sheet consists of an insulating base made of PTFE as the primary resin with metal-foil
bonded to one side or both.
4.2 Resin system
PTFE resin or modified PTFE as the primary resin, which has no filler.
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 61249-6-3.
5 Internal marking
AABUS (As agreed upon by user and supplier).
6 Electrical properties
The requirements for electrical properties are shown in Table 1.
Table 1 – Electrical
...


IEC 61249-2-53 ®
Edition 1.0 2025-10
NORME
INTERNATIONALE
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
ICS 31.180  ISBN 978-2-8327-0751-7

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SOMMAIRE
AVANT-PROPOS . 3
1 Domaine d'application . 5
2 Références normatives . 5
3 Termes et définitions . 6
4 Construction et matériaux . 6
4.1 Construction . 6
4.2 Système de résine . 6
4.3 Feuille métallique . 6
4.4 Renforcement . 6
5 Marquage intérieur . 6
6 Propriétés électriques . 6
7 Propriétés non électriques du stratifié plaqué cuivre . 7
7.1 Apparence de la feuille plaquée cuivre . 7
7.1.1 Généralités . 7
7.1.2 Indentations (trous et creux) . 7
7.1.3 Rides . 8
7.1.4 Éraflures . 8
7.1.5 Zones surélevées . 8
7.1.6 Ondulation superficielle . 8
7.2 Apparence de la face non métallisée. 9
7.3 Épaisseur du stratifié . 9
7.4 Courbure et vrillage . 9
7.5 Propriétés relatives à l'adhérence de la feuille de cuivre . 10
7.6 Choc thermique . 10
7.7 Usinage . 11
7.8 Stabilité dimensionnelle . 11
7.9 Dimensions et tolérances des feuilles . 11
7.9.1 Dimensions de feuille types . 11
7.9.2 Tolérances sur les dimensions de feuille . 11
7.10 Dimensions, tolérances et rectangularité des panneaux découpés . 11
7.10.1 Dimensions des panneaux découpés . 11
7.10.2 Tolérance sur les dimensions des panneaux découpés . 12
7.10.3 Rectangularité des panneaux découpés . 12
8 Propriétés non électriques du matériau de base après retrait complet de la feuille
de cuivre . 12
8.1 Généralités . 12
8.2 Apparence du matériau diélectrique de base . 12
8.3 Résistance à la flexion . 13
8.4 Inflammabilité . 13
8.5 Absorption d'eau . 13
8.6 Température de transition vitreuse et facteur de traitement . 14
8.7 Température de décomposition . 14
8.8 Décollement interlaminaire dans le temps (TMA, Time To Delamination) . 14
8.9 Dilatation suivant l'axe Z . 14
8.10 Dilatation suivant l'axe X/Y . 14
8.11 Conductivité thermique . 15
9 Assurance qualité . 15
9.1 Système qualité . 15
9.2 Responsabilité des contrôles . 15
9.3 Contrôle de qualification . 15
9.3.1 Généralités . 15
9.3.2 Échantillons . 15
9.3.3 Fréquence . 15
9.3.4 Règle du critère . 16
9.4 Contrôle de conformité de la qualité . 17
9.4.1 Généralités . 17
9.4.2 Lot de contrôle . 17
9.4.3 Contrôle du groupe A . 17
9.4.4 Contrôle du groupe B . 17
9.4.5 Contrôle du groupe C . 17
9.4.6 Règle du critère . 17
9.4.7 Lots rejetés . 17
9.5 Certificat de conformité . 17
9.6 Fiche technique de sécurité . 17
10 Emballage et marquage . 18
11 Informations de commande . 18
Annexe A (informative) Informations techniques . 19
A.1 Généralités . 19
A.2 Propriétés électriques . 19
A.3 Propriétés non électriques du matériau de base après retrait complet de la
feuille de cuivre . 19
Bibliographie . 20

Tableau 1 – Propriétés électriques . 6
Tableau 2 – Indentations . 8
Tableau 3 – Épaisseur nominale et tolérance du stratifié métallisé . 9
Tableau 4 – Exigences de courbure et de vrillage . 10
Tableau 5 – Exigences relatives à la force d'adhérence . 10
Tableau 6 – Exigences relatives aux chocs thermiques . 10
Tableau 7 – Stabilité dimensionnelle . 11
Tableau 8 – Tolérances dimensionnelles des panneaux découpés . 12
Tableau 9 – Rectangularité des panneaux découpés . 12
Tableau 10 – Exigences d'inflammabilité. 13
Tableau 11 – Exigences d'absorption d'eau . 14
Tableau 12 – Exigences de température de décomposition . 14
Tableau 13 – Exigences de décollement interlaminaire dans le temps . 14
Tableau 14 – Exigences de dilatation suivant l'axe Z . 14
Tableau 15 – Exigences de dilatation suivant l'axe X/Y . 15
Tableau 16 – Contrôle de qualification et de conformité . 16

COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
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

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L'IEC ne saurait être tenue pour responsable de ne pas avoir identifié de tels droits de brevets.
L'IEC 61249-2-53 a été établie par le comité d'études 91 de l'IEC, Techniques d'assemblage
des composants électroniques. Il s'agit d'une Norme internationale.
Le texte de cette Norme internationale est issu des documents suivants:
Projet Rapport de vote
91/1978/CDV 91/2044/RVC
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à son approbation.
La langue employée pour l'élaboration de cette Norme internationale est l'anglais.
Une liste de toutes les parties de la série IEC 61249, publiées sous le titre général Matériaux
pour circuits imprimés et autres structures d'interconnexion, se trouve sur le site web de l'IEC.
Le présent document a été rédigé conformément aux Directives ISO/IEC, Partie 2.
Ce document a été rédigé selon les Directives ISO/IEC, Partie 2, il a été développé selon les
Directives ISO/IEC, Partie 1 et les Directives ISO/IEC, Supplément IEC, disponibles sous
www.iec.ch/members_experts/refdocs. Les principaux types de documents développés par
l'IEC sont décrits plus en détail sous www.iec.ch/standardsdev/publications.
Le comité a décidé que le contenu de ce document ne sera pas modifié avant la date de stabilité
indiquée sur le site web de l'IEC sous webstore.iec.ch dans les données relatives au document
recherché. À cette date, le document sera
– reconduit,
– supprimé, ou
– révisé.
1 Domaine d'application
La présente partie de l'IEC 61249 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.
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu'ils constituent, pour tout ou partie
de leur contenu, des exigences du présent document. Pour les références datées, seule
l'édition citée s'applique. Pour les références non datées, la dernière édition du document de
référence s'applique (y compris les éventuels amendements).
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 (disponible en anglais seulement)
IEC 61189-2-721:2015, Méthodes d'essai pour les matériaux électriques, les cartes imprimées
et autres structures d'interconnexion et ensembles - Partie 2-721: Méthodes d'essai des
matériaux pour structures d'interconnexion - Mesure de la permittivité relative et de la tangente
de perte pour les stratifiés recouverts de cuivre en hyperfréquences à l'aide d'un résonateur
diélectrique en anneaux fendus
IEC 61189-2-803:2023, Méthodes d'essai pour les matériaux électriques, les cartes imprimées
et autres structures d'interconnexion et ensembles - Partie 2-803: Méthodes d'essai pour la
dilatation suivant l'axe Z des matériaux de base et des cartes imprimées
IEC 61189-2-807:2021, Méthodes d'essai pour les matériaux électriques, les cartes imprimées
et autres structures d'interconnexion et ensembles - Partie 2-807: Méthodes d'essai des
matériaux pour structures d'interconnexion - Température de décomposition (T ) par analyse
d
thermogravimétrique
IEC 61189-2-809:2024, Méthodes d'essai pour les matériaux électriques, les cartes imprimées
et autres structures d'interconnexion et ensembles - Partie 2-809: Essai du coefficient de
dilatation thermique (CTE) X/Y pour matériaux de base épais à l'aide d'un analyseur
thermomécanique (TMA)
IEC 61249-5-1, Matériaux pour les structures d'interconnexion - Partie 5: Collection de
spécifications intermédiaires pour feuilles et films conducteurs avec ou sans revêtement -
Section 1: Feuilles de cuivre (pour la fabrication de matériaux de base plaqués cuivre)
IEC 61249-6-3:2023, Matériaux pour circuits imprimés et autres structures d'interconnexion -
Partie 6-3 : Ensemble de spécifications intermédiaires pour matériaux de renfort - Spécification
des tissus finis en verre "E" pour circuits imprimés
ISO 11014:2009, Safety data sheet for chemical products - Content and order of sections
(disponible en anglais seulement)
IPC TM-650 TM 2.5.5.5, Stripline Test for Permittivity and Loss Tangent (Dielectric Constant
and Dissipation Factor) at X-Band (disponible en anglais seulement)
3 Termes et définitions
Aucun terme n'est défini dans le présent document.
L'ISO et l'IEC tiennent à jour des bases de données terminologiques destinées à être utilisées
en normalisation, consultables aux adresses suivantes:
– IEC Electropedia: disponible à l'adresse https://www.electropedia.org/
– ISO Online browsing platform: disponible à l'adresse httsp://www.iso.org/obp
4 Construction et matériaux
4.1 Construction
La feuille se compose d'une base isolante en PTFE comme résine primaire avec une feuille de
métal collée sur un côté ou sur les deux.
4.2 Système de résine
Résine PTFE ou PTFE modifiée en tant que résine primaire, qui est dépourvue de charge.
4.3 Feuille métallique
Cuivre tel que spécifié dans l'IEC 61249-5-1, feuille de cuivre (pour la fabrication de matériaux
plaqués cuivre). Les feuilles préférentielles sont déposées par électrolyse et présentent une
ductilité définie.
4.4 Renforcement
Verre E tissé comme spécifié dans l'IEC 61249-6-3.
5 Marquage intérieur
AABUS (À convenir entre l'utilisateur et le fournisseur).
6 Propriétés électriques
Les exigences relatives aux propriétés électriques sont indiquées dans le Tableau 1.
Tableau 1 – Propriétés électriques
Propriété Méthode d'essai Unités Exigence
Résistivité superficielle après chaleur
humide dans la chambre d'essai en
IEC 61189-2 2E04 MΩ ≥ 10 000
humidité
Résistivité transversale après chaleur
humide dans la chambre d'essai en IEC 61189-2 2E04 MΩ·m ≥ 5 000
humidité
Résistivité superficielle après E-24/125
IEC 61189-2 2E04 MΩ ≥ 1 000
dans la chambre
Résistivité transversale après E-24/125
IEC 61189-2 2E04 MΩ·m ≥ 1 000
dans la chambre d'essai
Propriété Méthode d'essai Unités Exigence
Type A: ≤ 2,75
Permittivité relative à l'état de IPC TM-650 Type B: > 2,75 ≤ 4,00
-
a
réception (10 GHz) TM 2.5.5.5
La valeur nominale doit être
AABUS
Permittivité relative à l'état de
IEC 61189-2-721 - AABUS
a
réception (10 GHz)
Type A: ≤ 0,0025
Facteur de dissipation à l'état de
Type B: > 0,0025, ≤ 0,005
IEC 61189-2-721 -
a
réception (10 GHz)
La valeur nominale doit être
AABUS
Coefficient thermique de permittivité
relative
IEC 61189-2-721 10–6/°C AABUS
(10 GHz, −55 °C~85 °C)
Rigidité diélectrique (uniquement pour
IEC 61189-2 2E02 kV/mm ≥ 20
les matériaux d'épaisseur < 0,5 mm)
Résistance à l'arc IEC 61189-2 2E14 s ≥ 60
Rupture diélectrique (unique
...


IEC 61249-2-53 ®
Edition 1.0 2025-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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
ICS 31.180  ISBN 978-2-8327-0751-7

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CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Construction and materials . 6
4.1 Construction . 6
4.2 Resin system . 6
4.3 Metal foil . 6
4.4 Reinforcement . 6
5 Internal marking . 6
6 Electrical properties . 6
7 Non-electrical properties of the copper-clad laminate . 7
7.1 Appearance of the copper-clad sheet . 7
7.1.1 General . 7
7.1.2 Indentations (pits and dents) . 7
7.1.3 Wrinkles . 8
7.1.4 Scratches . 8
7.1.5 Raised areas . 8
7.1.6 Surface waviness . 8
7.2 Appearance of the unclad face . 8
7.3 Laminate thickness . 8
7.4 Bow and twist . 9
7.5 Properties related to the copper foil bond . 10
7.6 Heat shock . 10
7.7 Machining . 10
7.8 Dimensional stability . 10
7.9 Sheet sizes and tolerances . 11
7.9.1 Typical sheet sizes . 11
7.9.2 Tolerances for sheet sizes . 11
7.10 Cut panels size, tolerances and rectangularity . 11
7.10.1 Cut panel sizes . 11
7.10.2 Size tolerances for cut panels . 11
7.10.3 Rectangularity of cut panels . 12
8 Non-electrical properties of the base material after complete removal of the
copper foil . 12
8.1 General . 12
8.2 Appearance of the dielectric base material . 12
8.3 Flexural strength . 12
8.4 Flammability . 13
8.5 Water absorption . 13
8.6 Glass transition temperature and cure factor . 13
8.7 Decomposition temperature . 13
8.8 Time to delamination (TMA) . 13
8.9 Z-axis expansion . 14
8.10 X/Y-axis expansion . 14
8.11 Thermal conductivity . 14
9 Quality assurance . 14
9.1 Quality system . 14
9.2 Responsibility for inspection . 14
9.3 Qualification inspection . 15
9.3.1 General . 15
9.3.2 Samples . 15
9.3.3 Frequency . 15
9.3.4 Criterion rule . 16
9.4 Quality conformance inspection . 16
9.4.1 General . 16
9.4.2 Inspection lot . 16
9.4.3 Group A inspection . 16
9.4.4 Group B inspection . 16
9.4.5 Group C inspection . 16
9.4.6 Criterion rule . 16
9.4.7 Rejected lots . 16
9.5 Certificate of conformance . 17
9.6 Safety data sheet . 17
10 Packaging and marking . 17
11 Ordering information . 17
Annex A (informative)  Engineering information . 18
A.1 General . 18
A.2 Electrical properties . 18
A.3 Non-electrical properties of the base material after complete removal of the
copper foil . 18
Bibliography . 19

Table 1 – Electrical properties . 6
Table 2 – Indentations . 7
Table 3 – Nominal thickness and tolerance of metal-clad laminate . 9
Table 4 – Bow and twist requirements . 9
Table 5 – Peel strength requirements . 10
Table 6 – Heat shock requirements . 10
Table 7 – Dimensional stability . 11
Table 8 – Size tolerances for cut panels . 11
Table 9 – Rectangularity of cut panels . 12
Table 10 – Flammability requirements . 13
Table 11 – Water absorption requirements . 13
Table 12 – Decomposition temperature requirements . 13
Table 13 – Time to delamination requirements . 14
Table 14 – Z-axis expansion requirements . 14
Table 15 – X/Y-axis expansion requirements . 14
Table 16 – Qualification and conformance inspection . 15

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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

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
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6) All users should ensure that they have the latest edition of this publication.
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 61249-2-53 has been prepared by IEC technical committee 91: Electronics assembly
technology. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
91/1978/CDV 91/2044/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
A list of all parts in the IEC 61249 series, published under the general title Materials for printed
boards and other interconnecting structures, can be found on the IEC website.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
1 Scope
This part of IEC 61249 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.
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 61189-2-721:2015, Test methods for electrical materials, printed boards and other
interconnection structures and assemblies - Part 2-721: Test methods for materials for
interconnection structures - Measurement of relative permittivity and loss tangent for copper
clad laminate at microwave frequency using a split post dielectric resonator
IEC 61189-2-803:2023, Test methods for electrical materials, printed boards and other
interconnection structures and assemblies - Part 2-803: Test methods for Z-axis expansion of
base materials and printed boards
IEC 61189-2-807:2021, Test methods for electrical materials, printed boards and other
interconnection structures and assemblies - Part 2-807: Test methods for materials for
interconnection structures - Decomposition temperature (T ) using TGA
d
IEC 61189-2-809:2024, Test methods for electrical materials, printed board and other
interconnection structures and assemblies - Part 2-809: X/Y coefficient of thermal expansion
(CTE) test for thick base materials by TMA
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 61249-6-3:2023, Materials for printed boards and other interconnecting structures - Part 6-
3: Sectional specification set for reinforcement materials - Specification for finished fabric
woven from "E" glass for printed boards
ISO 11014:2009, Safety data sheet for chemical products - Content and order of sections
IPC TM-650 TM 2.5.5.5, Stripline Test for Permittivity and Loss Tangent (Dielectric Constant
and Dissipation Factor) at X-Band
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
4 Construction and materials
4.1 Construction
The sheet consists of an insulating base made of PTFE as the primary resin with metal-foil
bonded to one side or both.
4.2 Resin system
PTFE resin or modified PTFE as the primary resin, which has no filler.
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 61249-6-3.
5 Internal marking
AABUS (As agreed upon by user and supplier).
6 Electrical properties
The requirements for electrical properties are shown in Table 1.
Table 1 – Electrical properties
Property Test method Units Requirement
Surface resistivity after damp heat while in
IEC 61189-2 2E04 MΩ ≥ 10 000
the humidity chamber
Volume resistivity after damp heat while in
IEC 61189-2 2E04 MΩ·m ≥ 5 000
the humidity chamber
Surface resistivity after E-24/125 while in
IEC 61189-2 2E04 MΩ ≥ 1 000
the chamber
Volume resistivity after E-24/125 while in
IEC 61189-2 2E04 MΩ·m ≥ 1 000
the chamber
Type A: ≤ 2,75
Type B: > 2,75 ≤ 4,00
a
IPC TM-650 TM 2.5.5.5 -
Relative permittivity as received (10 GHz)
Nominal value shall be
AABUS
a
IEC 61189-2-721 - AABUS
Relative permittivity as received (10 GHz)
Property Test method Units Requirement
Type A: ≤ 0.0025
Type B: > 0.0025, ≤ 0.005
a
IEC 61189-2-721 -
Dissipation factor as received (10 GHz)
Nominal value shall be
AABUS
Thermal coefficient of relative permittivity
IEC 61189-2-721 10–6/°C AABUS
(10 GHz, −55 °C~85 °C)
Electric strength (only for material thickness
IEC 61189-2 2E02 kV/mm ≥ 20
< 0,5 mm)
Arc resistance IEC 61189-2 2E14 s ≥ 60
Dielectric breakdown (only for material
IEC 61189-2 2E15 kV ≥ 35
thicknesses ≥ 0,5 mm)
a
The tolerance of relative permittivity around that nominal can be chosen as follows:
a) ± 0,02
b) ± 0,04
c) ± 0,05
d) ± 0,25
e) ± 0,50
f) AABUS.
7 Non-electrical properties of the copper-clad laminate
7.1 Appearance of the copper-clad sheet
7.1.1 General
Appearance of the copper-clad sheet shall be inspected in accordance with IEC 61189-2
method 2M18.
The copper-clad face shall be substantially free from pinhole and resin spots, and 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.
7.1.2 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 (see Table 2).
Table 2 – Indentations
Size Point value for each indentation
mm
≥ 0,13 ≤ 0,25 1
> 0,25 ≤ 0,50 2
> 0,50 ≤ 0,75 4
> 0,75 ≤ 1,00 7
> 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 Longest Dimensions ≤ 500 μm
Class C 5 maximum Longest Dimensions ≤ 380 μm
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.
7.1.3 Wrinkles
There shall be no wrinkles in the copper surface.
7.1.4 Scratches
There shall be no feeling scratches, and the scratch shall have no exposed base materials.
7.1.5 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
7.1.6 Surface waviness
When examined in accordance to test method 2M12 of IEC 61189-2, the surface waviness in
both the machine and crossmachine direction shall not exceed 7 μm.
7.2 Appearance of the unclad face
Appearance of the unclad face shall be inspected in accordance with IEC 61189-2 method 2M18.
No pitting, cavity, resin starvation, measling, loose and foreign inclusions (including cured resin
particles) that may affect the use of the material. Colour should be uniform, small irregularities
in colour are permitted.
7.3 Laminate thickness
The thickness shall not depart from the nominal thickness by more than the appropriate value
shown in Table 3, when the copper-clad laminate is tested in accordance with test method 2D01
of IEC 61189-2. The fine tolerances shall apply unless the other tolerances are ordered.
Table 3 – Nominal thickness and tolerance of metal-clad laminate
Nominal thickness excluding metal foil Tolerance requirement
mm ± mm
Coarse Fine Extra fine
≥ 0,05 ≤ 0,10 0,020 0,015 0,010
> 0,10 ≤ 0,15 0,025 0,020 0,015
> 0,15 ≤ 0,30 0,040 0,025 0,020
> 0,30 ≤ 0,50 0,050 0,040 0,030
> 0,50 ≤ 0,80 0,065 0,050 0,040
> 0,80 ≤ 1,00 0,075 0,050 0,040
> 1,00 ≤ 1,70 0,090 0,050 0,040
> 1,70 ≤ 2,60 0,100 0,075 0,065
> 2,60 ≤ 3,20 0,125 0,090 0,075
> 3,20 ≤ 10,0 0,150 0,100 0,090

7.4 Bow and twist
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 4.
Table 4 – Bow and twist requirements
Nominal thickness Requirement
mm %
Property Test method
Copper foil on one Copper foil on both

side sides
a
IEC 61189-2 2M01 < 0,5 Not Applicable Not Applicable
Bow and twist
≥ 0,5 < 1,6 ≤ 0,75 ≤ 0,75
≥ 1,6 ≤ 0,50 ≤ 0,50
a
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 which are not defined in Table 4 shall be agreed upon
by user and supplier.
7.5 Properties related to the copper foil bond
The peel strength requirements are shown in Table 5.
Table 5 – Peel strength requirements
Requirements
N/mm
Copper foil Thickness and Weight
Property Test method
18 μm 35 μm ≥ 70 μm
2 2 2
(152 g/m ) (305 g/m ) (≥ 610 g/m )
Peel strength as received IEC 61189-2 2M13 ≥ 1,00 ≥ 1,00 ≥ 1,00
≥ 1,00 ≥ 1,00 ≥ 1,00
Peel strength after heat
IEC 61189-2 2M14
shock of 20 s
No blistering or delamination
Peel strength after ≥ 0,70 ≥ 0,70 ≥ 1,00
exposure to solvent
vapour. Solvents as IEC 61189-2 2M07
No blistering or delamination
agreed upon between
purchaser and supplier
Peel strength at 125 °C
IEC 61189-2 2M17 ≥ 1,00 ≥ 1,00 ≥ 1,00
a
(optional)
a
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.

7.6 Heat shock
The heat shock requirements are shown in Table 6.
Table 6 – Heat shock requirements
Property Test method Requirement
IEC 61189-2 2C05 No blistering, no delamination
Blistering after 20 s heat shock 288 °C

7.7 Machining
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.
7.8 Dimensional stability
The dimensional stability requirements are shown in Table 7. When specimens are tested in
accordance to IEC 61189-2 method 2X02, the observed tolerance shall be as specified in
Table 7. The nominal dimensional stability value shall be as agreed upon between user and
supplier. The tolerance range around the nominal value shall be Class A, unless otherwise
specified on the purchase order.
Table 7 – Dimensional stability
Property Test method Class Tolerance
ppm
A ± 1 000
B ± 800
Dimensional stability IEC 61189-2 2X02
C ± 500
X AABUS
7.9 Sheet sizes and tolerances
7.9.1 Typical sheet sizes
Sheet sizes are matters of agreement between purchaser and supplier. However, the
recommended sizes are listed below:
– 915 mm × 1 220 mm;
– 1 000 mm × 1 000 mm;
– 1 000 mm × 1 200 mm;
– 1 065 mm × 1 155 mm;
– 1 065 mm × 1 280 mm.
7.9.2 Tolerances for sheet sizes
+25
The size of sheet delivered by the supplier shall not deviate by more than mm from the
−0
ordered size.
7.10 Cut panels size, tolerances and rectangularity
7.10.1 Cut panel sizes
Cut panel sizes shall be, when delivered, in accordance with the purchaser's specification.
7.10.2 Size tolerances for cut panels
For panels cut to size according to the purchaser's specification, the tolerances shown in
Table 8 for length and width shall apply. Tolerances indicated as normal shall be in effect unless
otherwise specified by in the purchasing specification.
Table 8 – Size tolerances for cut panels
Panel size Tolerance requirement
mm ± mm
Normal Close
≤ 300 2,0 0,5
> 300 ≤ 600 2,0 0,8
> 600 2,0 1,6
NOTE The specified tolerances include all deviations caused by cutting the panels.

7.10.3 Rectangularity of cut panels
For panels cut to size according to the purchaser's specification, the requirements shown in
Table 9 for rectangularity shall apply. Tolerance indicated as normal shall be in effect unless
otherwise specified in the purchasing specification.
Table 9 – Rectangularity of cut panels
Requirement
Property Test method mm/m
Normal Close
Rectangularity of cut panels IEC 61189-2 2M23 ≤ 3 ≤ 2

8 Non-electrical properties of the base material after complete removal of the
copper foil
8.1 General
For the requirements of non-electrical properties of the base material after complete removal
of the copper foil, see 8.2 to 8.11. Some typical values are given in Annex A.
8.2 Appearance of the dielectric base material
The etched dielectric base material shall be inspected to verify that no surface or subsurface
imperfections of the dielectric material exceed those shown below. The panels shall be
inspected using an optical aid apparatus which provides a minimum magnification of 4 X.
Referee inspection shall be conducted at 10 X magnification. Lighting conditions of inspection
shall be appropriate to the material under inspection or as agreed upon between user and
supplier.
Surface and subsurface imperfections (such as resin starvation, voids, foreign inclusions) shall
be acceptable provided that the imperfections meet the following:
– the reinforcement fibres are not cut or exposed;
– the foreign inclusions are not conductive, encapsulated metallic particles of any size are not
allowed;
– the imperfections do not propagate as a result of thermal stress;
– the foreign inclusions are translucent;
– opaque foreign fibres are less than 15 mm in length and average no more than two per
300 mm × 300 mm area;
– opaque foreign inclusions other than fibres shall not exceed 0,50 mm, less than 0,15 mm
shall not be counted, between 0,50 mm and 0,15 mm shall average no more than two spots
per 300 mm × 300 mm area;
– voids (sealed voids or surface void) have a longest dimension less than 0,075 mm and there
should not be more than three voids in a 3,5 mm diameter circle.
8.3 Flexural strength
When the laminate is tested in accordance with test method 2M20 of IEC 61189-2, the flexural
strength shall be AABUS.
8.4 Flammability
When the laminate is tested in accordance with test method 2C06 of IEC 61189-2 the
flammability shall be as shown in Table 10, or AABUS.
The performance labelled V-0 shall be in effect unless otherwise noted on the purchase order.
Table 10 – Flammability requirements
Property
Test method Requirements Designation
Flammability
Flaming combustion time after each application of IEC 61189-2 2C06
≤ 10 s
the flame for each test specimen
Total flaming combustion time for the 10 flame
≤ 50 s
applications for each set of five specimens
Glowing combustion time after the second removal V-0
≤ 30 s
of the test flame
Flaming or glowing combustion up to the holding
None
clamp
Dripping flaming particles that ignite the tissue paper None

8.5 Water absorption
When the laminate is tested in accordance with test method 2N02 of IEC 61189-2, the maximum
water absorption shall be as shown in Table 11.
Table 11 – Water absorption requirements
Property Test method Thickness Requirement
mm %
Water absorption IEC 61189-2 2N02 ≥ 0,05 < 10, 0 < 0,05

8.6 Glass transition temperature and cure factor
Not Applicable.
8.7 Decomposition temperature
The requirements for the decomposition temperature are stated in Table 12.
Table 12 – Decomposition temperature requirements
Property Test method Requirement
(°C)
Decomposition temperature
IEC 61189-2-807 ≥ 450
5 % wt loss from 50 °C
8.8 Time to delamination (TMA)
The requirements for time to delamination are found in Table 13.
Table 13 – Time to delamination requirements
Property Test method Requirements
(min)
Time to delamination IEC 61189-2-804 ≥ 60
T288 (at 288 °C)
8.9 Z-axis expansion
The requirements for Z-Axis expansion are stated in Table 13, only for material thickness
≥ 0,5 mm, copper should be removed before testing.
Table 14 – Z-axis expansion requirements
Property Test method Requirement
(ppm/°C)
Z-axis % from 50 °C to 288 °C
IEC 61189-2-803 ≤ 280 or AABUS
(material thickness ≥ 0,5 mm)
8.10 X/Y-axis expansion
The requirements for X/Y-Axis expansion are stated in Table 14, only for material thickness
≥ 0,5 mm, copper should be removed before testing.
Table 15 – X/Y-axis expansion requirements
Property Test method Requirement
X/Y-axis % from 50 °C to 288 °C
IEC 61189-2-809 AABUS
(material thickness ≥ 0,5 mm)
8.11 Thermal conductivity
The requirements and method for thermal conductivity should be AABUS.
9 Quality assurance
9.1 Quality system
The supplier shall operate a quality system to support quality conformance inspection.
The supplier shall operate a Management System for Environmental Control to support
environmental considerations.
9.2 Responsibility for inspection
The supplier is responsible for all inspections of the manufactured material. The purchaser or
an appointed third party may audit this inspection.
9.3 Qualification inspection
9.3.1 General
Laminates furnished under this document shall be qualified. Qualification testing shall be
performed to demonstrate the manufacturer's ability to meet the requirements of this document.
A list of the normal qualification tests can be found in Table 16. The manufacturer shall retain
a data file which supports that the materials meet this standard and shall be readily available
for review upon request.
9.3.2 Samples
A sample sheet shall be selected from normal production for each manufacturer's brand type
for which qualification is sought. The number of samples required is one sheet.
9.3.3 Frequency
Each manufacturer's brand type product shall undergo qualification once. Property items for the
qualification inspection shall be in accordance with Table 16 or the relevant product standards.
Any major changes to the product raw material, production process shall be requalified.
Table 16 – Qualification and conformance inspection
Conformance testing
Test method
Qualification
Property
Conformance
testing
IEC 61189-2 Group
frequency
Peel strength after heat shock 2M14 Yes B Lot
Peel strength at 125 °C 2M17 Yes C Quarterly
Peel strength after solvent vapour 2M07 Yes C Quarterly
Peel strength as received 2M13 Yes C Quarterly
Dimensional stability 2X02 Yes C Monthly
Flexural strength 2M20 Yes C Annually
Flammability 2C06 Yes C Monthly
Thermal Conductivity XXX Yes C Annually
Heat shock 2C05 Yes B Lot
Decomposition temperature IEC 61189-2-807 Yes C Annually
Z-axis expansion IEC 61189-2-803 Yes C Quarterly
X/Y-Axis expansion IEC 61189-2-809 Yes C Quarterly
Relative permittivity as received
IEC 61189-2-721 Yes B Lot
(10 GHz)
Dissipation factor as received
IEC 61189-2-721 Yes B Lot
(10 GHz)
Thermal coefficient of relative
IEC 61189-2-721 Yes - -
permittivity (10 GHz, - 55 °C ~ 85 °C)
Surface resistance after damp
2E04 Yes C Annually
heat/recovery
Volume resistance after damp
2E04 Yes C Annually
heat/recovery
Arc resistance 2E14 Yes C Annually
Dielectric breakdown 2E15 Yes C Quarterly
Electric strength 2E11 Yes C Quarterly
Water absorption 2N02 Yes C Quarterly
Conformance testing
Test method
Qualification
Property
Conformance
testing
IEC 61189-2 Group
frequency
Bow and twist 2M01 Yes B Lot
Appearance of the dielectric base
2M18 Yes B Lot
material
Appearance of the copper-clad sheet,
2M18 Yes A All
Appearance of the unclad face
Thickness 2D01 Yes A All
Sheet sizes, Cut panel sizes See 7.9, 7.10 No B Lot
Rectangularity of cut panels 2M23 No B Lot

9.3.4 Criterion rule
If there is a failure item, it is judged to be unqualified.
9.4 Quality conformance inspection
9.4.1 General
Conformance inspection shall be conducted in accordance with Table 16, unless otherwise
specified. Additional tests requested by the customer must be stated in the purchase order.
9.4.2 Inspection lot
An inspection lot consists of all laminate delivered at one time from the same material (same
lot or equivalent), same production process under the same conditions substantially.
9.4.3 Group A inspection
Group A inspection item is the properties indicated as "All" in Table 16.
9.4.4 Group B inspection
Group B inspection item is the properties indicated as "Lot" in Table 16. The sample of Group
B shall be randomly selected one from the Lot that has passed the Group A inspection.
9.4.5 Group C inspection
Group C inspection item is the properties indicated as "Monthly" or longer in Table 16; the
inspection frequency shall be in accordance with Table 16 or quality system. The sample of
Group C shall be randomly selected from the Lot that has passed the Group B inspection, two
samples needed in an inspection period.
9.4.6 Criterion rule
The acceptance number for the Group A, Group B and Group C tests shall be zero (0). No
failure shall be allowed for any specimen tested.
9.4.7 Rejected lots
If an inspection lot is rejected, the supplier may rework it to correct the defects or screen out
the defective units and resubmit for reinspection. Resubmitted lots shall be inspected using
tightened inspection. Such lots shall be separate from new lots and shall be clearly identified
as reinspected lots. If the defect cannot be screened out, the supplier shall sample addit
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