prEN 14903

Surfaces for sports areas - Determination of rotational friction

This European Standard specifies a method for the determination of the friction between any type of indoor sports surface and a rotating foot with a vertical load.
NOTE   This method simulates the load exerted by an athlete in a rotating movement on the floor.

Sportböden für Innenbereiche - Bestimmung der Drehreibung

Diese Europäische Norm legt ein Verfahren zur Bestimmung der Reibung zwischen einem beliebigen Sportbodentyp und einem Drehfuß mit vertikaler Last fest. Das Verfahren kann sowohl im Labor als auch vor Ort angewendet werden.

Sols sportifs - Détermination de la glissance en rotation

La présente Norme européenne spécifie une méthode permettant de déterminer la glissance entre un type quelconque de sol sportif et un pied en rotation soumis à une charge verticale. Cette méthode est applicable aux essais effectués en laboratoire et sur site.

Podloge za notranje športne dejavnosti – Ugotavljanje odpornosti proti trenju pri vrtenju

General Information

• Status: Not Published
• Technical Committee: CEN/TC 217 - Surfaces for sport areas
• Drafting Committee: CEN/TC 217/WG 2 - Surfaces of sports halls
• Current Stage: 4098 - Decision to abandon - Enquiry
• Due Date: 24-Jul-2008
• Completion Date: 24-Jul-2008
• Ref Project: oSIST prEN 14903:2006 - Surfaces for sports areas - Determination of rotational friction

Overview

prEN 14903 (CEN) - Surfaces for indoor sports areas - Determination of rotational friction - specifies a laboratory and field test method to measure the rotational friction between any indoor sports surface and a rotating test foot under a vertical load. The method simulates the load and rotational movement of an athlete’s foot to assess slip behaviour during turning movements on sports floors and sports hall surfaces.

Key Topics and Technical Requirements

• Test principle: A circular test foot rotates on the surface at constant speed while torque is recorded; the sliding-phase torque is used to assess friction.
• Test foot and loading:
  • Steel disc diameter: (100 ± 1) mm with a glued neoprene rubber sole ≥ 5 mm thick.
  • Vertical load: (500 ± 5) N applied to the test foot.
  • Rotation speed: motor rotates clockwise at 30 rpm (one revolution ≈ 2–3 s).
• Apparatus and measurement:
  • Torque transducer in the drive line; instruments must record torque peaks ≥ 10 ms and torques up to 100 Nm with accuracy within 3%.
  • Torque/time curves show an initial phase (rising torque) and a sliding phase (horizontal). Average torque is taken from the sliding phase; ignore first 0.5 s if the early increase is slow.
• Sampling and conditioning:
  • Laboratory: at least five test pieces, tests in at least three places; condition pieces 16 h at 23 ± 2 °C and 50 ± 5% RH.
  • Field testing: at least five test points; record ambient temperature and humidity.
• Result expression:
  • Arithmetic mean of three recordings per test piece/point.
  • Optional friction coefficient: μ = 0.03 · D / V, where D = torque (Nm), V = vertical load (kN).
• Uncertainty:
  • Torque measurement uncertainty < 3%; μ uncertainty should be < 5%, though overall variability of floors may limit accuracy to ~15%.
• Test report must reference EN 14903 and include surface description, test conditions, results and report date.

Applications and Users

• Practical uses: safety assessment, quality control, acceptance testing, product development and compliance checks for indoor sports floors (parquet, synthetic, point- or mixed-elastic systems).
• Primary users: flooring manufacturers, independent test laboratories, sports facility managers, architects, installers, procurement teams, and standards bodies specifying slip performance for sports halls.

Related Standards

• This document is part of the CEN/TC 217 suite on surfaces for sports areas. It is complementary to other performance tests (shock absorption, surface evenness, and general slip resistance) used when specifying or certifying indoor sports flooring.

Standards Content (Sample)

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2004
ICS
English version
Surfaces for indoor sports areas - Determination of rotational
friction
Sols sportifs intérieurs - Détermination de la glissance en
rotation
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 217.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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 Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14903:2004: E
worldwide for CEN national Members.

Contents Page
Foreword. 3
1 Scope . 3
2 Normative references . 3
3 Terms and definitions. 3
4 Principle. 3
5 Sampling. 3
5.1 Laboratory testing . 3
5.2 Field testing. 4
6 Apparatus . 4
6.1 Test unit . 4
6.2 Measuring and recording instruments . 4
7 Preparation of test pieces. 4
7.1 Laboratory testing . 4
7.2 Field testing. 4
8 Procedure . 4
9 Expression of results . 5
10 Uncertainty . 5
11 Test report . 5
Foreword
This document (prEN 14903:2004) has been prepared by Technical Committee CEN/TC 217 "Surfaces for
sports areas", the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
1 Scope
This European Standard specifies a method for the determination of the friction between any type of indoor
sports surface and a rotating foot with a vertical load.
NOTE This method simulates the load exerted by an athlete in a rotating movement on the floor.
2 Normative references
Not applicable.
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply.
3.1
friction coefficient
horizontal force between the test foot and the floor (derived from the measured torque) divided by the vertical
load on the foot when the foot rotates (see clause 9)
3.2
vertical load
constant, vertical force exerted on the floor by the test foot
3.3
torque
force transferred to the test foot from the floor when the test foot under vertical load rotates on the floor
4 Principle
Friction is measured by allowing a circular test foot u
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