Footwear - Test methods for outsoles - Dimensional stability

This international standard specifies a method for determining
the linear shrinkage after heating of test specimens prepared
from outsoles.

Schuhwerk - Prüfverfahren für Laufsohlen - Maßhaltigkeit

Chaussures - Méthodes d'essai applicables aux semelles d'usure - Stabilité dimensionnelle

Obutev - Preskusne metode za zunanje podplate - Dimenzijska stabilnost (ISO/DIS 20873:2016)

General Information

Status
Not Published
Publication Date
17-Dec-2017
Technical Committee
CEN/TC 309 - Footwear
Current Stage
3098 - Decision to reject - Consensus building
Start Date
11-Apr-2014
Completion Date
11-Apr-2014

Relations

Effective Date
18-Jan-2023

Overview

prEN ISO 20873 is an international standard developed by CEN that specifies test methods for assessing the dimensional stability of footwear outsoles. This standard focuses on a precise procedure to determine the linear shrinkage of outsole materials after exposure to controlled heat treatment. Measuring shrinkage is crucial to ensure the quality, durability, and performance of footwear, particularly for outsoles exposed to varying environmental conditions.

Developed collaboratively under the ISO and CEN frameworks, ISO 20873 provides manufacturers and quality control professionals with a reliable method to evaluate outsole materials' resistance to thermal deformation by quantifying dimensional changes after heating.

Key Topics

  • Scope
    The standard specifies a method to measure linear shrinkage of test specimens from outsoles after heating at 70 °C ± 2 °C for 24 hours.

  • Test Specimens and Sampling
    Outsole samples are cut to defined dimensions and prepared according to ISO 17709 and conditioned per ISO 18454 to ensure consistent atmospheric conditions during testing.

  • Test Procedure

    1. Two reference cuts (50 mm or 100 mm apart) are made on the surface of the outsole specimen.
    2. Initial distance between marks is measured with an accuracy of ±0.2 mm.
    3. Specimens are heated in a thermostatically controlled oven at 70 °C ± 2 °C for 24 hours.
    4. Post-heating measurements are taken after cooling and conditioning, noting any deformation.
  • Instruments and Equipment

    • Steel rule marked in millimeters
    • Sharp knife or scalpel for specimen preparation
    • Oven capable of maintaining 70 °C ± 2 °C
    • Measuring device accurate to ± 0.2 mm (steel rule with magnifying glass or optical device)
    • Thickness gauge applying pressure at 10 kPa ± 3 kPa
  • Result Calculation
    Shrinkage is expressed as a percentage reduction of the original distance between reference cuts, calculated by:
    S = ((L₀ - L) / L₀) × 100%

    where L₀ is the initial measurement, and L is the post-heat-treatment measurement.

  • Test Report Requirements
    The standard mandates detailed documentation including:

    • Shrinkage results
    • Specimen dimensions and thickness
    • Sample descriptions (styles, codes, colors)
    • Reference to the test method
    • Test date
    • Any deviations from the standard
    • Sample age and atmospheric conditions during testing

Applications

  • Footwear Manufacturing
    Manufacturers use ISO 20873 to verify outsole materials conform to dimensional stability requirements, ensuring consistent fit, comfort, and appearance after heat exposure during manufacturing or use.

  • Quality Control
    The standard supports quality assurance processes to detect possible material deformities or inadequate thermal resistance before final product release.

  • Material Development and R&D
    Material scientists and developers apply the test method to evaluate new outsole compounds or modifications, optimizing formulations to reduce shrinkage and improve product longevity.

  • Compliance Verification
    Footwear exporters and importers may require testing under ISO 20873 to meet market regulations or customer demands for durability and performance.

Related Standards

  • ISO 18454 – Standard atmospheres for conditioning and testing of footwear and components
  • ISO 17709 – Sampling location, preparation, and conditioning duration for footwear test pieces
  • ISO 4648 – Measurement of dimensions for rubber vulcanized or thermoplastic test pieces
  • ISO/TC 216 – Footwear Technical Committee responsible for footwear-related ISO standards

This structured approach through ISO 20873 enhances consistency and reliability in testing footwear outsoles' dimensional stability, supporting the production of high-quality, durable footwear that meets international market expectations.

Frequently Asked Questions

prEN ISO 20873 is a draft published by the European Committee for Standardization (CEN). Its full title is "Footwear - Test methods for outsoles - Dimensional stability". This standard covers: This international standard specifies a method for determining the linear shrinkage after heating of test specimens prepared from outsoles.

This international standard specifies a method for determining the linear shrinkage after heating of test specimens prepared from outsoles.

prEN ISO 20873 is classified under the following ICS (International Classification for Standards) categories: 61.060 - Footwear. The ICS classification helps identify the subject area and facilitates finding related standards.

prEN ISO 20873 has the following relationships with other standards: It is inter standard links to EN 12772:1999. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

prEN ISO 20873 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-april-2016
Obutev - Preskusne metode za zunanje podplate - Dimenzijska stabilnost (ISO/DIS
20873:2016)
Footwear - Test methods for outsoles - Dimensional stability (ISO/DIS 20873: 2016)
Schuhe - Prüfverfahren für Laufsohlen - Maßhaltigkeit (ISO/DIS 20873:2016)
Chaussures - Méthodes d'essai applicables aux semelles d'usure - Stabilité
dimensionnelle (ISO/DIS 20873:2016)
Ta slovenski standard je istoveten z: prEN ISO 20873
ICS:
61.060 Obuvala Footwear
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT INTERNATIONAL STANDARD
ISO/DIS 20873
ISO/TC 216 Secretariat: AENOR
Voting begins on: Voting terminates on:
2016-01-28 2016-04-28
Footwear — Test methods for outsoles — Dimensional
stability
Chaussures — Méthodes d’essai applicables aux semelles d’usure — Stabilité dimensionnelle
ICS: 61.060
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the European Committee for Standardization
(CEN), and processed under the CEN lead mode of collaboration as defined in the
Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member
bodies for a parallel five month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments
received, will be submitted to a parallel two-month approval vote in ISO and
THIS DOCUMENT IS A DRAFT CIRCULATED
formal vote in CEN.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
To expedite distribution, this document is circulated as received from the
IN ADDITION TO THEIR EVALUATION AS
committee secretariat. ISO Central Secretariat work of editing and text
BEING ACCEPTABLE FOR INDUSTRIAL,
composition will be undertaken at publication stage.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 20873:2015(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2015

ISO/DIS 20873:2015(E)
© ISO 2015
All rights reserved. Unless otherwise specified, 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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Published in Switzerland
ii © ISO 2015 – All rights reserved

ISO/WD 20873
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 20873 was prepared by Technical Committee ISO/TC 216, Footwear, Subcommittee SC , and by
Technical Committee CEN/TC 309, Footwear in collaboration.
This second/third/. edition cancels and replaces the first/second/. edition (), [clause(s) / subclause(s) /
table(s) / figure(s) / annex(es)] of which [has / have] been technically revised.
WORKING DRAFT ISO/WD 20873
Footwear — Test methods for outsoles — Dimensional stability
1 Scope
This international standard specifies a method for determining the linear shrinkage after heating of test specimens
prepared from outsoles.
2 Normative references
The following normative documents contain provisions which, through reference i
...

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