SIST EN ISO 6941:2026

• Abstract:

  This document specifies a method for the measurement of flame spread times of vertically oriented textile fabrics and industrial products in the form of single or multi-component textile fabrics (coated, quilted, multilayered, sandwich combinations, and similar combinations) when subjected to a small, defined flame.

• Status: Published
• Public Enquiry End Date: 30-Jul-2025
• Publication Date: 18-Jun-2026
• ICS: 13.220.40 - Ignitability and burning behaviour of materials and products
• ICS: 59.080.30 - Textile fabrics
• Technical Committee: ITEK - Textile and textile products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 10-Jun-2026
• Due Date: 15-Aug-2026
• Completion Date: 19-Jun-2026
• Ref Project: EN ISO 6941:2026 - Textile fabrics - Burning behaviour - Measurement of flame spread properties of vertically oriented specimens (ISO 6941:2026)

• Refers: SIST ISO 4880:1999 - Burning behaviour of textiles and textile products -- Vocabulary
• Effective Date: 09-Sep-2026
• Referred By: SIST EN 13209-2:2006 - Child use and care articles - Baby carriers - Safety requirements and test methods - Part 2: Soft carrier
• Effective Date: 27-May-2026
• Referred By: SIST EN 13274-4:2020 - Respiratory protective devices - Methods of test - Part 4: Flame test
• Effective Date: 27-May-2026
• Referred By: SIST EN 12941:1999 - Respiratory protective devices - Powered filtering devices incorporating a helmet or a hood - Requirements, testing, marking
• Effective Date: 27-May-2026
• Referred By: SIST EN 1827:1999+A1:2009 - Respiratory protective devices - Half masks without inhalation valves and with separable filters to protect against gases or gases and particles or particles only - Requirements, testing, marking
• Effective Date: 27-May-2026
• Referred By: SIST EN 12942:1999 - Respiratory protective devices - Power assisted filtering devices incorporating full face masks, half masks or quarter masks - Requirements, testing, marking
• Effective Date: 27-May-2026
• Referred By: SIST EN 13772:2011 - Textiles and textile products - Burning behaviour - Curtains and drapers - Measurement of flame spread of vertically oriented specimens with large ignition source
• Effective Date: 27-May-2026
• Referred By: SIST EN 407:2004 - Protective gloves against thermal risks (heat and/or fire)
• Effective Date: 27-May-2026
• Referred By: SIST EN 14931:2006 - Pressure vessels for human occupancy (PVHO) - Multi-place pressure chamber systems for hyperbaric therapy - Performance, safety requirements and testing
• Effective Date: 27-May-2026
• Revises: SIST EN ISO 6941:2004 - Textile fabrics - Burning behaviour - Measurement of flame spread properties of vertically oriented specimens (ISO 6941:2003)
• Effective Date: 25-Sep-2024

SIST EN ISO 6941:2026 is the Slovenian national standard identical to EN ISO 6941:2026, which adopts ISO 6941:2026. It specifies a laboratory method for measuring flame spread time on vertically oriented textile fabrics and textile-based industrial products when they are exposed to a small, defined flame. It is used by laboratories, manufacturers, and buyers who need comparable burn-behaviour data for fabrics, assemblies, and finished textile products.

What does SIST EN ISO 6941:2026 specify?

SIST EN ISO 6941:2026 specifies a test method for vertically oriented textile fabrics and industrial products made from single or multi-component textile fabrics, including coated, quilted, multilayered, sandwich combinations, and similar assemblies. The method measures how long a flame front takes to travel between marked positions after a small flame is applied under controlled conditions.

The introduction notes that the method assesses response to flame contact in a controlled laboratory setting and warns that the results may not represent situations with restricted air supply or exposure to large, intense heat sources. It also notes that seams and trimmings can be tested as part of the assembly in which they are used.

The document is organized into clauses 1 to 12, with two annexes:

Annex	What it covers
Annex A	Normative description and construction of the burner
Annex B	Informative experimental techniques and practical guidance

What are the key requirements of SIST EN ISO 6941:2026?

• Clause 4, Principle - SIST EN ISO 6941:2026 applies a defined flame from a specified burner for 10 s to either the surface or the bottom edge of a vertically oriented specimen, then records the times for the flame front to sever marker threads at three positions. In practice, this gives a repeatable way to compare how fast flame spreads across a fabric.

• Clause 5 and Annex A, Apparatus - SIST EN ISO 6941:2026 requires a mounting frame, a burner that can move from standby to operating position, a rectangular specimen holder with pins, a template for marking specimen locations, suitable gas, three timing devices, and white mercerized cotton marker threads. In practice, the accuracy of the result depends heavily on using the specified hardware and setting it up correctly.

• Clause 6, Precautions - SIST EN ISO 6941:2026 requires equipment materials that are not harmed by corrosive combustion products, enough surrounding air volume to avoid oxygen depletion, and ventilation to clear smoke and fumes between tests. In practice, this protects both the test result and the operator, especially in enclosed or open-fronted test enclosures.

• Clauses 7 and 8, Sampling and atmosphere - SIST EN ISO 6941:2026 calls for six test specimens, with specimen orientation marked by length direction and width direction, and an extra specimen for setup. Specimens are conditioned for at least 24 h at 20 °C and 65 % relative humidity unless otherwise specified, then tested within 2 min of removal; testing is carried out at 10 °C to 30 °C, 35 % to 65 % relative humidity, and air movement below 0.2 m/s. In practice, this keeps moisture and airflow from distorting the burn behaviour.

• Clause 9, Setting up the apparatus - SIST EN ISO 6941:2026 defines two setup routes: Procedure A for surface ignition and Procedure B for bottom edge ignition. Procedure A uses a horizontal flame reach adjustment, while Procedure B uses a vertical flame height adjustment and an inclined burner position. In practice, the choice of procedure affects how the flame meets the specimen, so the setup must match the intended test mode.

• Clause 10, Test procedure - SIST EN ISO 6941:2026 requires six fresh specimens for each test set, with the marker threads attached before ignition and the exposure surface and orientation recorded. The test flame is applied for 10 s or for the ignition time determined in ISO 6940 testing, and the times to sever the lower, middle, and upper marker threads are recorded for each specimen. In practice, the upper thread time is the most useful comparison point when ranking materials.

• Clause 11 and Clause 12, Precision and report - SIST EN ISO 6941:2026 notes that repeatability depends strongly on material type, with knitted fabrics and shrinking fabrics needing careful mounting, and it recommends reporting sagging problems. The test report must identify the standard, gas used, date, ambient conditions, specimen attachment method, specimen identification and pre-treatment, exposure surface, ignition mode, ignition time, individual severance times, deviations, and unusual observations. In practice, this makes the result traceable and easier to compare across laboratories.

What terms does SIST EN ISO 6941:2026 define?

• Flame application time - the period for which the ignition flame is applied to the test specimen.

• Flame spread time - the time taken for a flame on a burning material to travel a specified distance under specified test conditions.

• Surface ignition - the test setup in which the burner flame is applied to the surface of the vertically mounted specimen.

• Bottom edge ignition - the test setup in which the burner flame is applied from below to the bottom edge of the vertically mounted specimen.

• Marker threads - the cotton thread loops placed at three positions beside the specimen so the operator can measure when the flame front reaches each point.

• Critical ignition time - the ignition time determined in ISO 6940 testing and used instead of the default 10 s exposure when that value is selected.

Who uses SIST EN ISO 6941:2026?

SIST EN ISO 6941:2026 is used by textile test laboratories, quality control teams, and product development engineers who need a controlled measure of flame spread on fabrics and textile assemblies. It is also relevant to manufacturers of coated, quilted, multilayered, and sandwich textile products, because the method can be applied to complete assemblies rather than only to simple fabrics.

Buyers, specifiers, and conformity assessment teams use the document when they need a comparable laboratory result for burn behaviour. It is especially useful when seams, trimmings, or different fabric directions need to be evaluated as part of the finished textile construction.

What changed in SIST EN ISO 6941:2026 from the previous edition?

SIST EN ISO 6941:2026 supersedes EN ISO 6941:2003 and replaces the second edition of ISO 6941. The changes stated in the document are:

• Figure 1 b) was corrected, including the angular dimension line and the shape of the gas jet tip.
• Figure 3 a) and Figure 3 b) were revised to show the test specimen more clearly.
• The revision is described as clarifying the document without structural changes.

Which standards are used with SIST EN ISO 6941:2026?

• ISO 4880, Burning behaviour of textiles and textile products - Vocabulary - provides the vocabulary and definitions used by the document.

• ISO 6940, Textile fabrics - Burning behaviour - Determination of ease of ignition of vertically oriented specimens - provides the related ignition method and the critical ignition time referenced in the procedure.

• ISO 2768-1, General tolerances - Part 1: Tolerances for linear and angular dimensions without individual tolerance indications - is cited in the figure notes for dimensional tolerances on the apparatus drawings.

What does the SIST EN ISO 6941:2026 document contain?

SIST EN ISO 6941:2026 contains the scope, normative references, terms and definitions, principle, apparatus requirements, precautions, sampling rules, conditioning and test atmosphere, setup instructions, the two test procedures, precision guidance, and the reporting requirements. The technical heart of the document is the pair of procedures for surface ignition and bottom edge ignition, which are supported by detailed apparatus and setup instructions.

The document also includes figures for the burner, the specimen holder, and the burner positions and flame adjustments used in both procedures. Annex A describes the burner construction in detail, while Annex B gives practical experimental techniques such as handling, safety, mounting, and specimen behaviour during testing.

SLOVENSKI STANDARD
01-julij-2026
Tekstilije - Gorljivost - Meritve razširjanja plamena navpično nameščenih
preskušancev (ISO 6941:2026)
Textile fabrics - Burning behaviour - Measurement of flame spread properties of vertically
oriented specimens (ISO 6941:2026)
Textile Flächengebilde - Brennverhalten - Messung der
Flammenausbreitungseigenschaften vertikal angeordneter Proben (ISO 6941:2026)
Textiles - Comportement au feu - Détermination des propriétés de propagation de
flamme d'éprouvettes orientées verticalement (ISO 6941:2026)
Ta slovenski standard je istoveten z: EN ISO 6941:2026
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
59.080.30 Tkanine Textile fabrics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 6941
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2026
EUROPÄISCHE NORM
ICS 13.220.40; 59.080.30 Supersedes EN ISO 6941:2003
English Version
Textile fabrics - Burning behaviour - Measurement of
flame spread properties of vertically oriented specimens
(ISO 6941:2026)
Étoffes - Comportement au feu - Détermination des Textile Flächengebilde - Brennverhalten - Messung der
propriétés de propagation de flamme d'éprouvettes Flammenausbreitungseigenschaften vertikal
orientées verticalement (ISO 6941:2026) angeordneter Proben (ISO 6941:2026)
This European Standard was approved by CEN on 28 April 2026.

CEN 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 CEN
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 CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6941:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 6941:2026) has been prepared by Technical Committee ISO/TC 38 "Textiles" in
collaboration with Technical Committee CEN/TC 248 “Textiles and textile products” the secretariat of
which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by November 2026, and conflicting national standards
shall be withdrawn at the latest by November 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 6941:2003.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 6941:2026 has been approved by CEN as EN ISO 6941:2026 without any modification.

International
Standard
ISO 6941
Third edition
Textile fabrics — Burning behaviour
2026-05
— Measurement of flame spread
properties of vertically oriented
specimens
Étoffes — Comportement au feu — Détermination des propriétés
de propagation de flamme d'éprouvettes orientées verticalement
Reference number
ISO 6941:2026(en) © ISO 2026
ISO 6941:2026(en)
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 6941:2026(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
5.6 Timing device .2
6 Precautions . 4
6.1 Construction of testing equipment . .4
6.2 Location of test apparatus.5
6.3 Health and safety of operators .5
7 Sampling . 5
7.1 Number of test specimens .5
7.2 Test specimen holder pin location marks .5
7.3 Test specimen size .5
8 Conditioning and testing atmosphere. 5
8.1 Conditioning.5
8.2 Testing atmosphere .6
9 Setting up the apparatus . 6
9.1 Procedures A (Surface ignition) .6
9.1.1 Mounting of the test specimen .6
9.1.2 Operating position of the burner .6
9.1.3 Flame adjustment — Horizontal reach .6
9.1.4 Flame position .6
9.2 Procedure B (Bottom edge ignition) .6
9.2.1 Mounting of the test specimen .6
9.2.2 Operating position of the burner .6
9.2.3 Flame adjustment — Vertical flame height .7
9.2.4 Flame position .7
10 Test procedure . 8
10.1 Surface ignition .8
10.2 Bottom edge ignition.9
11 Precision . 9
12 Test report . 10
Annex A (normative) Description and construction of the burner .11
Annex B (informative) Experimental techniques .12
Bibliography .13

iii
ISO 6941:2026(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO 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, ISO 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
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 38, Textiles, in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 248, Textiles and textile products, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 6941:2003), which has been technically
revised.
The main changes are as follows:
— Figure 1 b) has been corrected with the proper angular dimension line and the shape of the tip of the gas
jet;
— Figure 3 a) and Figure 3 b) have been revised to show the test specimen clear;
— this revision aims to clarify without any structural changes.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
ISO 6941:2026(en)
Introduction
This method is one of two closely related methods of test for the inflammability of textile. This method
[1]
determines the “flame spread time” as defined in ISO 4880 . The other method observes and measures
[2]
“ease of ignition” (seeISO 6940 ).
The method given in this document assesses the properties of textile fabrics in response to flame contact
under controlled conditions. There is a possibility that results do not apply the situations where there is
restricted air supply or exposure to large sources of intense heat.
The influence of seams on the behaviour of textile fabrics can be determined by this method, the seam being
positioned within the test specimen so as to be subjected to the test flame. Whenever practicable, trimmings
are tested as part of the textile fabric assembly on which they are or will be used.

v
International Standard ISO 6941:2026(en)
Textile fabrics — Burning behaviour — Measurement of flame
spread properties of vertically oriented specimens
1 Scope
This document specifies a method for the measurement of flame spread times of vertically oriented textile
fabrics and industrial products in the form of single or multi-component textile fabrics (coated, quilted,
multilayered, sandwich combinations, and similar combinations) when subjected to a small, defined flame.
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.
ISO 4880, Burning behaviour of textiles and textile products — Vocabulary
ISO 6940, Textile fabrics — Burning behaviour — Determination of ease of ignition of vertically oriented
specimens
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4880 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
flame application time
time for which the ignition flame is applied to the test specimen
3.2
flame spread time
time taken by a flame on a burning material to travel a spe
...