EN ISO 12951:2020
(Main)Textile floor coverings - Determination of mass loss, fibre bind and stair nosing appearance change using the Lisson Tretrad machine (ISO 12951:2020)
General Information
- Abstract
This document specifies four methods of test for textile floor coverings (with or without an underlay, see Clause 9) using the Lisson Tretrad machine.
— test A: determination of mass loss of textile floor coverings, also used to assess fibre bind of synthetic pile carpets;
— test B: determination of stair nosing appearance change of textile floor coverings;
— test C: determination of fibre bind on synthetic loop pile carpets;
— test D: determination of fibre bind (hairiness) on needled floor coverings and floor coverings without pile.
- Status
- Published
- Publication Date
- 16-Jun-2020
- Withdrawal Date
- 30-Dec-2020
- Technical Committee
- CEN/TC 134 - Resilient and textile floor coverings
- Drafting Committee
- CEN/TC 134/WG 8 - Textile floor coverings
- Current Stage
- 6060 - Definitive text made available (DAV) - Publishing
- Start Date
- 17-Jun-2020
- Completion Date
- 17-Jun-2020
Overview
EN ISO 12951:2020 (CEN adoption of ISO 12951:2020) specifies laboratory test methods for evaluating textile floor coverings using the Lisson Tretrad machine. It defines four test procedures to assess mass loss, fibre bind (pile retention/hairiness) and stair nosing appearance change for textile floor coverings with or without underlay. The standard is intended for manufacturers, test laboratories, specifiers and quality engineers concerned with flooring durability and appearance performance.
Key Topics
- Scope and tests
- Test A - Determination of mass loss of textile floor coverings; also used to assess fibre bind on synthetic pile carpets.
- Test B - Determination of stair nosing appearance change (simulating wear at stair edges).
- Test C - Determination of fibre bind on synthetic loop pile carpets.
- Test D - Determination of fibre bind (hairiness) on needled floor coverings and floor coverings without pile.
- Principle of testing
- Specimens are exposed under constant load and slippage to a four-footed Tretrad wheel for a prescribed number of double passages.
- Apparatus and parameters
- Lisson Tretrad machine comprising a bed plate, vacuum cleaning system and two Tretrad assemblies.
- Bed plate front edge rounded to a 10 mm radius to simulate a stair nosing; track length (800 ± 40) mm.
- Specimens clamped under tension with a 20 ± 2 kg tension weight per specimen.
- Calibration and assessment
- The 2020 edition introduces two calibration methods for the apparatus and improves guidance for assessing Test C; examples of failure at 400 cycles are provided in Annex A.
- Conditioning and references
- Conditioning and testing atmosphere referenced to ISO 139; specimen selection and related test definitions reference other ISO standards.
Applications
- Product development and QC for carpet and textile floor coverings to quantify wear resistance, pile retention and appearance retention at stair nosings.
- Comparative testing for material selection, batch release or third‑party certification.
- Useful for flooring manufacturers, independent testing laboratories, architects, building specifiers and procurement teams evaluating floor covering durability and lifecycle performance.
Related standards
Normative and referenced documents include: ISO 139 (conditioning), ISO 1765, ISO 1957, ISO 2424 (vocabulary), ISO 8543 (mass of pile), ISO 9405 (appearance assessment) and EN 1307 (classification of textile floor coverings).
Keywords: EN ISO 12951:2020, ISO 12951:2020, Lisson Tretrad machine, textile floor coverings testing, mass loss test, fibre bind, stair nosing appearance, flooring durability, calibration.
Relations
- Effective Date
- 12-Apr-2017
- Effective Date
- 25-Aug-2026
- Effective Date
- 25-Aug-2026
- Effective Date
- 25-Aug-2026
- Effective Date
- 25-Aug-2026
- Effective Date
- 25-Aug-2026
- Effective Date
- 09-Feb-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Referred By
EN 14215:2018 - Textile floor coverings - Classification of machine-made rugs and runners - Effective Date
- 28-Jan-2026
- Referred By
EN 14215:2003 - Textile floor coverings - Classification of machine-made pile rugs and runners - Effective Date
- 28-Jan-2026
Frequently Asked Questions
EN ISO 12951:2020 is a standard published by the European Committee for Standardization (CEN). Its full title is "Textile floor coverings - Determination of mass loss, fibre bind and stair nosing appearance change using the Lisson Tretrad machine (ISO 12951:2020)". This standard covers: This document specifies four methods of test for textile floor coverings (with or without an underlay, see Clause 9) using the Lisson Tretrad machine. — test A: determination of mass loss of textile floor coverings, also used to assess fibre bind of synthetic pile carpets; — test B: determination of stair nosing appearance change of textile floor coverings; — test C: determination of fibre bind on synthetic loop pile carpets; — test D: determination of fibre bind (hairiness) on needled floor coverings and floor coverings without pile.
This document specifies four methods of test for textile floor coverings (with or without an underlay, see Clause 9) using the Lisson Tretrad machine. — test A: determination of mass loss of textile floor coverings, also used to assess fibre bind of synthetic pile carpets; — test B: determination of stair nosing appearance change of textile floor coverings; — test C: determination of fibre bind on synthetic loop pile carpets; — test D: determination of fibre bind (hairiness) on needled floor coverings and floor coverings without pile.
EN ISO 12951:2020 is classified under the following ICS (International Classification for Standards) categories: 97.150 - Floor coverings. The ICS classification helps identify the subject area and facilitates finding related standards.
EN ISO 12951:2020 has the following relationships with other standards: It is inter standard links to EN ISO 12951:2015, ISO 2424:2007, ISO 1957:2000, ISO 139:2005, ISO 1765:1986, ISO 8543:1998, ISO 9405:2015, EN 4637:2010, EN 1307:2014+A3:2018, EN 15767-3:2010, EN 13480-6:2012/A1:2016, EN 12237:2003, EN ISO 25178-603:2013, EN 14215:2018, EN 14215:2003. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN ISO 12951:2020 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2020
Nadomešča:
SIST EN ISO 12951:2015
Tekstilne talne obloge - Ugotavljanje masne izgube vlaken in spremembe videza z
uporabo Lissonovega aparata Tretrad (ISO 12951:2020)
Textile floor coverings - Determination of mass loss, fibre bind and stair nosing
appearance change using the Lisson Tretrad machine (ISO 12951:2020)
Textile Bodenbeläge - Bestimmung des Masseverlustes, der Fasereinbindung und der
Treppenkantenprüfung mittels Lisson-Tretradgerät (ISO 12951:2020)
Revêtements de sol textiles - Détermination de la perte de masse, de la sensibilité au
défibrage et du changement d'aspect au nez de marche à l'aide la machine Lisson
Tretrad (ISO 12951:2020)
Ta slovenski standard je istoveten z: EN ISO 12951:2020
ICS:
97.150 Talne obloge Floor coverings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 12951
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2020
EUROPÄISCHE NORM
ICS 97.150 Supersedes EN ISO 12951:2015
English Version
Textile floor coverings - Determination of mass loss, fibre
bind and stair nosing appearance change using the Lisson
Tretrad machine (ISO 12951:2020)
Revêtements de sol textiles - Détermination de la perte Textile Bodenbeläge - Bestimmung des Masseverlustes,
de masse, de la sensibilité au défibrage et du der Fasereinbindung und der Treppenkantenprüfung
changement d'aspect au nez de marche à l'aide la mittels Lisson-Tretradgerät (ISO 12951:2020)
machine Lisson Tretrad (ISO 12951:2020)
This European Standard was approved by CEN on 14 May 2020.
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, Turkey 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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12951:2020 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 12951:2020) has been prepared by Technical Committee ISO/TC 219 "Floor
coverings" in collaboration with Technical Committee CEN/TC 134 “Resilient, textile and laminate floor
coverings” the secretariat of which is held by NBN.
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 December 2020, and conflicting national standards
shall be withdrawn at the latest by December 2020.
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 12951:2015.
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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 12951:2020 has been approved by CEN as EN ISO 12951:2020 without any modification.
INTERNATIONAL ISO
STANDARD 12951
Third edition
2020-05
Textile floor coverings —
Determination of mass loss, fibre bind
and stair nosing appearance change
using the Lisson Tretrad machine
Revêtements de sol textiles — Détermination de la perte de masse,
de la sensibilité au défibrage et du changement d'aspect au nez de
marche à l'aide la machine Lisson Tretrad
Reference number
ISO 12951:2020(E)
©
ISO 2020
ISO 12951:2020(E)
© ISO 2020
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.
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Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
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Published in Switzerland
ii © ISO 2020 – All rights reserved
ISO 12951:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
5.1 Lisson Tretrad machine . 2
5.1.1 General. 2
5.1.2 Bed plate . 3
5.1.3 Tretrad assemblies . 3
5.1.4 Vacuum cleaning system . 3
6 Sampling and selection of test specimens . 5
7 Atmosphere for conditioning and testing . 5
8 Calibration . 6
8.1 Choice of the calibration carpet. 6
8.1.1 Method 1 . 6
8.1.2 Method 2 . 6
8.2 Calibration of the apparatus . 6
9 Procedure. 7
9.1 General . 7
9.2 Test A — Determination of mass loss of textile floor coverings . 7
9.3 Test B — Determination of stair nosing: appearance change of textile floor coverings . 8
9.4 Test C — Determination of fibre bind on synthetic loop pile carpets . 8
9.5 Test D — Determination of fibre bind (hairiness) on needled floorcoverings and
floor coverings without pile. 9
10 Calculation and expression of results . 9
10.1 Test A . 9
10.2 Test B .10
10.3 Test C .10
10.4 Test D .10
10.5 Unusual phenomena .11
11 Test report .11
Annex A (informative) Examples of failure at 400 cycles .12
ISO 12951:2020(E)
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
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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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
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 219, Floor coverings, in collaboration with
the European Committee for Standardization (CEN) Technical Committee CEN/TC 134, Resilient, textile
and laminate floor coverings, in accordance with the Agreement on technical cooperation between ISO
and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 12951:2015), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— two different methods are described for calibrating the apparatus;
— a better description of how to assess test C is provided;
— examples of failure are given in Annex A.
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 2020 – All rights reserved
INTERNATIONAL STANDARD ISO 12951:2020(E)
Textile floor coverings — Determination of mass loss, fibre
bind and stair nosing appearance change using the Lisson
Tretrad machine
1 Scope
This document specifies four methods of test for textile floor coverings (with or without an underlay,
see Clause 9) using the Lisson Tretrad machine.
— test A: determination of mass loss of textile floor coverings, also used to assess fibre bind of synthetic
pile carpets;
— test B: determination of stair nosing appearance change of textile floor coverings;
— test C: determination of fibre bind on synthetic loop pile carpets;
— test D: determination of fibre bind (hairiness) on needled floor coverings and floor coverings
without pile.
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 139, Textiles — Standard atmospheres for conditioning and testing
ISO 1765, Machine-made textile floor coverings — Determination of thickness
ISO 1957, Machine-made textile floor coverings — Selection and cutting of specimens for physical tests
ISO 2424, Textile floor coverings — Vocabulary
ISO 8543, Textile floor coverings — Methods for determination of mass
ISO 9405, Textile floor coverings — Assessment of changes in appearance
EN 1307:2014+A3: 2018, Textile floor coverings — Classification
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 2424 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
mass loss per unit area
m
v
difference between the sample mass before and after the wear test, related to the tested area
Note 1 to entry: See 10.1.
ISO 12951:2020(E)
3.2
relative mass loss
m
rv
ratio of the mass loss per unit area (3.1), as a percentage of the mass of pile per unit area
above the substrate
Note 1 to entry: The mass of pile per unit area above the substrate is determined in accordance with ISO 8543.
4 Principle
The specimens of a textile floor covering are exposed, at constant load and slippage and for a prescribed
number of double passages, to the action of a four-footed wheel (Tretrad), the feet of which are fitted
with interchangeable sole coverings.
5 Apparatus
5.1 Lisson Tretrad machine
5.1.1 General
A Lisson Tretrad machine comprises a bed plate, a vacuum cleaning system, and two Tretrad assemblies
(see Figure 1).
Key
1 support 7 bed plate
2 cog bar 8 specimen
3 Tretrad wheel 9 vacuum suction nozzle
4 frame 10 tension weight
a
5 drive Movement of the Tretrad.
6 foot
Figure 1 — Lisson Tretrad machine
2 © ISO 2020 – All rights reserved
ISO 12951:2020(E)
5.1.2 Bed plate
The bed plate faces are parallel to the track travelled by the Tretrad feet and the front edge of the plate
is rounded with a 10 mm radius to simulate a stair nosing.
The test surface is formed by the width of the Tretrad feet and the length of the track over which the
Tretrad runs. The track length shall be determined for each machine by measuring the distance between
the front edge of the bed plate and the perpendicular projection of the Tretrad axis at its furthermost
point of reversal. The length of track shall be (800 ± 40) mm.
Two clamps mounted at each end of the bed plate are used to hold each specimen under tension. The
tension is applied by means of a weighted third clamp, each specimen being subjected to a tension
weight of (20 ± 2) kg.
5.1.3 Tretrad assemblies
The Lisson Tretrad machine has two Tretrad assemblies, each of which comprises a Tretrad mounted in
a frame that is free to rotate around an axis that is 135 mm to 140 mm above the upper surface of the
bed plate.
Each Tretrad comprises four e
...