SIST EN IEC 61249-3-6:2026

• Abstract:

  This part of IEC 61249 specifies requirements for properties of polytetrafluoroethylene (PTFE) filled unreinforced laminated sheet of a thickness 0,02 mm up to 3,2 mm, of defined flammability (vertical burning test), copper-clad.; This document is applicable to the design, manufacture, use of PTFE filled unreinforced laminated sheet of defined flammability (vertical burning test), copper-clad.; Its flame resistance is defined in terms of the flammability requirements of 8.3.

• Status: Published
• Public Enquiry End Date: 31-May-2025
• Publication Date: 19-Aug-2026
• ICS: 31.180 - Printed circuits and boards
• Technical Committee: ITIV - Electronics assembly technology and Environmental standardization
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 14-Jul-2026
• Due Date: 18-Sep-2026
• Completion Date: 20-Aug-2026
• Ref Project: EN IEC 61249-3-6:2026 - Materials for circuit boards and other interconnecting structures - Part 3-6: Sectional specification set for unreinforced base materials clad and unclad - Polytetrafluoroethylene (PTFE) filled laminate sheets of defined flammability (vertical burning test), copper-clad

• Refers: SIST EN IEC 61189-2-805:2025 - Test methods for electrical materials, printed board and other interconnection structures and assemblies - Part 2-805: X/Y CTE Test for Thin Base Materials by TMA
• Effective Date: 16-Jun-2026
• Refers: SIST EN IEC 61189-2-803:2023 - Test methods for electrical materials, printed board and other interconnection structures and assemblies - Part 2-803: Test methods for Z-Axis Expansion of base materials and printed board
• Effective Date: 16-Jun-2026
• Refers: SIST EN 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 Split Post Dielectric Resonator
• Effective Date: 16-Jun-2026
• Refers: SIST EN 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
• Effective Date: 16-Jun-2026
• Refers: SIST EN IEC 61189-2-807:2021 - Test methods for electrical materials, printed board and other interconnection structures and assemblies - Part 2-807: Test methods for materials for interconnection structures - Decomposition Temperature (Td) using TGA
• Effective Date: 16-Jun-2026
• Refers: SIST EN 61249-5-1:2001 - Materials for interconnection structures -- Part 5: Sectional specification set for conductive foils and films with or without coatings - Section 1: Copper foils (for the manufacture of copper-clad base materials)
• Effective Date: 16-Jun-2026

SIST EN IEC 61249-3-6:2026 is a CENELEC European Standard that adopts IEC 61249-3-6:2026 without modification. It specifies requirements for PTFE filled, unreinforced, copper-clad laminate sheets used for printed boards and other interconnecting structures. It is intended for designers, manufacturers, purchasers and quality teams that need to specify, test, inspect and accept these materials.

What does SIST EN IEC 61249-3-6:2026 specify?

SIST EN IEC 61249-3-6:2026 covers the construction, electrical performance, non-electrical properties, quality assurance, packaging and ordering information for PTFE filled, unreinforced copper-clad laminate sheet. The document applies to the design, manufacture and use of this material, and it defines flame resistance by the vertical burning test.

The document is organized into clauses 1 to 11, followed by one informative annex.

Annex	What it covers
Annex A	Engineering information with typical values for design and application work

Clause 4 covers construction and materials, Clause 6 covers electrical properties, Clause 7 covers the base material before copper removal, Clause 8 covers properties after complete removal of the copper foil, Clause 9 covers quality assurance, Clause 10 covers packaging and marking, and Clause 11 covers ordering information.

What are the key requirements of SIST EN IEC 61249-3-6:2026?

Construction and material make-up

SIST EN IEC 61249-3-6:2026 specifies a laminate built from PTFE or modified PTFE as the primary resin, with filler added and copper foil bonded to one or both sides. It also states that there is no reinforcement.

In practice, this means buyers need to identify the resin system and copper-clad form they want, and they must treat filler choice and copper configuration as part of the product definition.

Electrical performance

SIST EN IEC 61249-3-6:2026 sets electrical property requirements in Table 1, including resistivity after humidity exposure, relative permittivity, dissipation factor, thermal coefficient of relative permittivity, electric strength, arc resistance and dielectric breakdown. Some properties are given as agreed values between user and supplier, while the relative permittivity is grouped into Types A, B and C.

In practice, this section matters when the laminate will be used at microwave frequency or in demanding insulation applications. Purchasers need to state the relative permittivity type and nominal value in the order so the supplier can test and ship to the right electrical target.

Appearance, thickness and mechanical flatness

SIST EN IEC 61249-3-6:2026 requires the copper-clad face and the unclad face to be visually acceptable, with limits on pinholes, resin spots, indentations, wrinkles, scratches and raised areas. It also sets thickness tolerance classes, bow and twist limits, dimensional stability classes, and requirements for sheet sizes, cut panel sizes and rectangularity.

In practice, this is the part that controls yield and machinability. Fabricators use it to decide whether a sheet can be drilled, sheared and processed without edge damage, and buyers use it to define how tight the supplied size and flatness must be.

Bond to the copper foil and heat resistance

SIST EN IEC 61249-3-6:2026 includes peel strength requirements in several states, including as received, after heat shock, after exposure to solvent vapour and, optionally, at elevated temperature. It also requires the material to withstand a heat shock test without blistering or delamination.

In practice, this shows whether the copper bond will survive manufacturing and later thermal stress. It is especially relevant for drilling, soldering and other high-temperature assembly steps.

Base material properties after copper removal

SIST EN IEC 61249-3-6:2026 defines the dielectric base material requirements after the copper foil is removed, including appearance, flammability, water absorption, decomposition temperature, Z-axis CTE, X/Y-axis CTE and thermal conductivity. Flammability is specified as V-0 unless otherwise ordered.

In practice, this is the section that matters for the core laminate itself rather than the plated sheet. It helps users assess thermal behavior, moisture response and fire performance once the copper is no longer part of the test piece.

Quality assurance, inspection and supply

SIST EN IEC 61249-3-6:2026 requires qualification testing, conformance inspection and documented quality control. It separates inspection into Group A, Group B and Group C items, requires zero acceptance for these tests, and allows reinspection of rejected lots under tightened inspection. It also calls for a certificate of conformance on request and a safety data sheet in accordance with ISO 11014.

In practice, this gives both supplier and purchaser a common acceptance framework. It tells the supplier what to test routinely and gives the buyer a basis for incoming inspection, audits and traceability.

Ordering and identification

SIST EN IEC 61249-3-6:2026 requires orders to identify the document reference, material type, size, thickness, copper cladding, relative permittivity type, and any non-default classes for indentation, thickness tolerance, dimensional stability, panel size tolerance, rectangularity and flammability. It also covers marking, packaging and lot identification.

In practice, this is the section that prevents ambiguity in procurement. If these details are not stated, the supplier will apply the document defaults, which may not match the intended application.

What terms does SIST EN IEC 61249-3-6:2026 define?

• PTFE - Polytetrafluoroethylene, the primary resin used in the laminate.
• CTE - Coefficient of thermal expansion, used for both Z-axis and X/Y-axis thermal movement.
• V-0 - The flammability designation used for the vertical burning test.
• Group A - Inspection items checked on every unit or every sheet/panel lot as specified in Table 15.
• Group B - Inspection items checked lot by lot after Group A acceptance.
• Group C - Periodic inspection items checked at monthly, quarterly or annual intervals depending on the property.

Who uses SIST EN IEC 61249-3-6:2026?

SIST EN IEC 61249-3-6:2026 is used by laminate manufacturers, PCB material suppliers, PCB fabricators, purchasing teams and quality assurance staff. It is also used by test laboratories that perform qualification and conformance testing, and by auditors checking that supplied materials match the agreed classes and test methods.

The document is most relevant in printed boards and other interconnecting structures, where electrical behavior, copper bond strength, dimensional stability and flammability all affect manufacturability and end-use reliability.

Which standards are used with SIST EN IEC 61249-3-6:2026?

Standard	What it contributes
IEC 61189-2	General test methods for materials for interconnection structures
IEC 61189-2-721	Relative permittivity, loss tangent and thermal coefficient at 10 GHz
IEC 61189-2-803	Z-axis expansion testing
IEC 61189-2-805	X/Y CTE testing by TMA
IEC 61189-2-807	Decomposition temperature using TGA
IEC 61249-5-1	Copper foils for the manufacture of copper-clad base materials
ISO 11014	Safety data sheet content and order of sections
IPC-TM-650 TM 2.5.5.5	Stripline test for permittivity and loss tangent at X-Band

The document also notes IEC 60695-11-10 and UL 94 in connection with the vertical flame test, and it refers to ISO 9001:2015 and ISO 14001:2015 in the quality assurance context and bibliography.

What does the SIST EN IEC 61249-3-6:2026 document contain?

SIST EN IEC 61249-3-6:2026 contains detailed tables for electrical properties, appearance grading, thickness tolerance, bow and twist, peel strength, heat shock, dimensional stability, flammability, water absorption, decomposition temperature and thermal expansion. It also contains inspection tables that split qualification and conformance testing into groups and frequencies.

Annex A adds typical engineering values for design use, including electrical and thermal figures. The bibliography points to related vocabulary, fire test and management system standards that support design, testing and quality work.

SLOVENSKI STANDARD
01-september-2026
Materiali za plošče tiskanih vezij in druge povezovalne strukture - 3-6. del: Nabor
področnih specifikacij za ojačane podložne materiale, pokovinjene in
nepokovinjene -Llaminatne plošče z določeno vnetljivostjo, polnjene s
politetrafluoretilenom (preskus navpične gorljivosti), z bakreno oblogo
Materials for printed boards and other interconnecting structures - Part 3-6: Sectional
specification set for unreinforced base materials, clad and unclad - PTFE filled laminate
sheets of defined flammability (vertical burning test), copper-clad
Materialien für Leiterplatten und andere Verbindungsstrukturen - Teil 3-6:
Rahmenspezifikationen für unverstärkte Basismaterialien, kaschierte und unkaschierte
ungefüllte PTFE-Laminatplatten mit definierter Brennbarkeit (Brennprüfung mit vertikaler
Prüflingslage), kupferkaschiert
Matériaux pour circuits imprimés et autres structures d’interconnexion - Partie 3-6:
Collection de spécifications intermédiaires pour matériaux de base non renforcés,
métallisés et non métallisés - Feuilles stratifiées en PTFE avec charges d’inflammabilité
définie (essai de combustion verticale), plaquées cuivre
Ta slovenski standard je istoveten z: EN IEC 61249-3-6:2026
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.

EUROPEAN STANDARD EN IEC 61249-3-6

NORME EUROPÉENNE
EUROPÄISCHE NORM July 2026
ICS 31.180
English Version
Materials for circuit boards and other interconnecting structures -
Part 3-6: Sectional specification set for unreinforced base
materials clad and unclad - Polytetrafluoroethylene (PTFE) filled
laminate sheets of defined flammability (vertical burning test),
copper-clad
(IEC 61249-3-6:2026)
Matériaux pour circuits imprimés et autres structures Materialien für Leiterplatten und andere
d'interconnexion - Partie 3-6: Collection de spécifications Verbindungsstrukturen - Teil¿3 6:
intermédiaires pour matériaux de base non renforcés, Abschnittsspezifikationen für unverstärkte kaschierte und
métallisés et non métallisés - Feuilles stratifiées en ptfe unkaschierte Basismaterialien - PTFE gefüllte Laminattafeln
avec charges d'inflammabilité définie (essai de combustion mit definierter Brennbarkeit (vertikale Brandprüfung),
verticale), plaquées cuivre kupferkaschiert
(IEC 61249-3-6:2026) (IEC 61249-3-6:2026)
This European Standard was approved by CENELEC on 2026-06-23. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61249-3-6:2026 E

European foreword
The text of document 91/2102/FDIS, future edition 1 of IEC 61249-3-6, prepared by TC 91 "Electronics
assembly technology" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC
as EN IEC 61249-3-6:2026.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2027-07-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-07-31
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61249-3-6:2026 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60695-11-10 NOTE Approved as EN 60695-11-10
ISO 9001:2015 NOTE Approved as EN ISO 9001:2015 (not modified)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 61189-2 - Test methods for electrical materials, printed EN 61189-2 -
boards and other interconnection structures and
assemblies - Part 2: Test methods for materials
for interconnection structures
IEC 61189-2-721 - Test methods for electrical materials, printed EN 61189-2-721 -
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 - Test methods for electrical materials, printed EN IEC 61189-2-803 -
boards and other interconnection structures and
assemblies - Part 2-803: Test methods for Z-
axis expansion of base materials and printed
boards
IEC 61189-2-805 - Test methods for electrical materials, printed EN IEC 61189-2-805 -
boards and other interconnection structures and
assemblies - Part 2-805: X/Y CTE test for thin
base materials by TMA
IEC 61189-2-807 - Test methods for electrical materials, printed EN IEC 61189-2-807 -
boards and other interconnection structures and
assemblies - Part 2-807: Test methods for
materials for interconnection structures -
Decomposition temperature (Td) using TGA
IEC 61249-5-1 - Materials for interconnection structures - Part 5: EN 61249-5-1 -
Sectional specification set for conductive foils
and films with and without coatings - Section 1:
Copper foils (for the manufacture of copper-clad
base materials)
ISO 11014 - Safety data sheet for chemical products - - -
Content and order of sections
IPC-TM-650 TM - Stripline Test for Permittivity and Loss Tangent - -
2.5.5.5 (Dielectric Constant and Dissipation Factor) at
X-Band
IEC 61249-3-6 ®
Edition 1.0 2026-05
INTERNATIONAL
STANDARD
Materials for circuit boards and other interconnecting structures -
Part 3-6: Sectional specification set for unreinforced base materials clad and
unclad - Polytetrafluoroethylene (PTFE) filled laminate sheets of defined
flammability (vertical burning test), copper-clad
ICS 31.180  ISBN 978-2-8327-1248-1

IEC 61249-3-6:2026-05(en)
IEC 61249-3-6:2026 © IEC 2026
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms, definitions and abbreviated terms . 6
3.1 Terms and definitions. 6
3.2 Abbreviated terms . 6
4 Construction and materials . 6
4.1 Construction . 6
4.2 Resin system . 6
4.3 Filler . 6
4.4 Metal foil . 6
4.5 Reinforcement . 6
5 Internal marking . 6
6 Electrical properties . 6
7 Non-electrical properties of the base material . 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
7.2 Appearance of the unclad face . 8
7.3 Laminate thickness . 9
7.4 Bow and twist . 9
7.5 Properties related to the copper foil bond . 9
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 sizes, 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 . 11
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 Flammability . 12
8.4 Water absorption . 13
8.5 Glass transition temperature and cure factor . 13
8.6 Decomposition temperature . 13
8.7 Z-axis CTE . 13
8.8 X/Y-axis CTE . 13
8.9 Thermal conductivity . 14
IEC 61249-3-6:2026 © IEC 2026
9 Quality assurance . 14
9.1 Quality system . 14
9.2 Responsibility for inspection . 14
9.3 Qualification inspection . 14
9.3.1 General . 14
9.3.2 Samples . 14
9.3.3 Frequency . 14
9.3.4 Criterion rule . 14
9.4 Quality conformance inspection . 15
9.4.1 General . 15
9.4.2 Inspection lot . 15
9.4.3 Group A inspection . 15
9.4.4 Group B inspection . 15
9.4.5 Group C inspection . 16
9.4.6 Criterion rule . 16
9.4.7 Rejected lots . 16
9.5 Certificate of conformance . 16
9.6 Safety data sheet . 16
10 Packaging and marking . 16
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 . 7
Table 2 – Indentations . 8
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 . 10
Table 8 – Size tolerances for cut panels . 11
Table 9 – Rectangularity of cut panels . 11
Table 10 – Flammability requirements . 12
Table 11 – Water absorption requirements . 13
Table 12 – Decomposition temperature requirements . 13
Table 13 – Z-axis CTE requirements . 13
Table 14 – X/Y-axis CTE requirements . 13
Table 15 – Qualification and conformance inspection . 14

IEC 61249-3-6:2026 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Materials for circuit boards and other interconnecting structures -
Part 3-6: Sectional specification set for unreinforced base materials clad
and unclad - Polytetrafluoroethylene (PTFE) filled 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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consensus of opinion on the relevant subjects since each technical committee has representation from all
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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
may be required to implement this document. However, implementers are cautioned that this may not represent
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 61249-3-6 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
91/2102/FDIS 91/2110/RVD
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.
IEC 61249-3-6:2026 © IEC 2026
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.
A list of all parts in the IEC 61249 series, published under the general title Materials for circuit
boards and other interconnecting structures, can be found on the IEC website.
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.
IEC 61249-3-6:2026 © IEC 2026
1 Scope
This part of IEC 61249 specifies requirements for properties of polytetrafluoroethylene (PTFE)
filled unreinforced laminated sheet of a thickness 0,02 mm up to 3,2 mm, of defined flammability
(vertical burning test), copper-clad.
This document is applicable to the design, manufacture, use of PTFE filled unreinforced
laminated sheet of defined flammability (vertical burning test), copper-clad.
Its flame resistance is defined in terms of the flammability requirements of 8.3.
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, 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, Test methods for electrical materials, printed board 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 split post dielectric resonator
IEC 61189-2-803, Test methods f
...