SIST EN ISO 17831-1:2025

SLOVENSKI STANDARD
01-julij-2025
Nadomešča:
SIST EN ISO 17831-1:2016
Trdna biogoriva - Določanje mehanske odpornosti peletov in briketov - 1. del:
Peleti (ISO 17831-1:2025)
Solid biofuels - Determination of mechanical durability of pellets and briquettes - Part 1:
Pellets (ISO 17831-1:2025)
Biogene Festbrennstoffe - Bestimmung der mechanischen Festigkeit von Pellets und
Briketts - Teil 1: Pellets (ISO 17831-1:2025)
Biocombustibles solides - Détermination de la résistance mécanique des granulés et des
briquettes - Partie 1: Granulés (ISO 17831-1:2025)
Ta slovenski standard je istoveten z: EN ISO 17831-1:2025
ICS:
75.160.40 Biogoriva Biofuels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 17831-1
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2025
EUROPÄISCHE NORM
ICS 75.160.40 Supersedes EN ISO 17831-1:2015
English Version
Solid biofuels - Determination of mechanical durability of
pellets and briquettes - Part 1: Pellets (ISO 17831-1:2025)
Biocombustibles solides - Détermination de la Biogene Festbrennstoffe - Bestimmung der
résistance mécanique des granulés et des briquettes - mechanischen Festigkeit von Pellets und Briketts - Teil
Partie 1: Granulés (ISO 17831-1:2025) 1: Pellets (ISO 17831-1:2025)
This European Standard was approved by CEN on 4 April 2025.

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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17831-1:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 17831-1:2025) has been prepared by Technical Committee ISO/TC 238 "Solid
Biofuels and Pyrogenic Biocarbon" in collaboration with Technical Committee CEN/TC 335 “Solid
Biofuels and Pyrogenic Biocarbon” the secretariat of which is held by SIS.
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 October 2025, and conflicting national standards shall
be withdrawn at the latest by October 2025.
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 17831-1:2015.
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 17831-1:2025 has been approved by CEN as EN ISO 17831-1:2025 without any
modification.
International
Standard
ISO 17831-1
Second edition
Solid biofuels — Determination of
2025-03
mechanical durability of pellets and
briquettes —
Part 1:
Pellets
Biocombustibles solides — Détermination de la résistance
mécanique des granulés et des briquettes —
Partie 1: Granulés
Reference number
ISO 17831-1:2025(en) © ISO 2025

ISO 17831-1:2025(en)
© ISO 2025
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 17831-1:2025(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
6 Sample preparation . 3
7 Procedure . 3
8 Calculation of the mechanical durability . 3
9 Performance characteristics . 4
9.1 General .4
9.2 Repeatability .4
9.3 Reproducibility .4
10 Test report . 4
Annex A (informative) Example of a pellet tester with two boxes . 5
Bibliography . 6

iii
ISO 17831-1:2025(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 238, Solid biofuels and pyrogenic biocarbon, in
collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 335,
Solid biofuels and pyrogenic biocarbon, in accordance with the Agreement on technical cooperation between
ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 17831-1:2015), which has been technically
revised.
The main changes are as follows:
— the introduction has been revised;
— a reference to ISO 21945 has been included;
— the description of the sample preparation has been revised to provide more practical guidance for the
preparation of test portions;
— the description of sieving procedures has been substituted by a reference to ISO 5370.
A list of all parts in the ISO 17831 series can be found on the ISO website.
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 17831-1:2025(en)
Introduction
Compressed solid biomass fuel is usually assigned either as pellets or briquettes, of which pellets usually
have a diameter less or equal to 25 mm while for briquettes the diameter is higher (see ISO 17225-1). The
mechanical durability is an important parameter to estimate the tendency to create new fines by abrasion of
pellets or briquettes during handling.
To account for the different particle dimensions, it is necessary to specify different test apparatuses for
determination of the mechanical durability of pellets and briquettes.

v
International Standard ISO 17831-1:2025(en)
Solid biofuels — Determination of mechanical durability of
pellets and briquettes —
Part 1:
Pellets
1 Scope
This document specifies a method for determination of the mechanical durability of pellets. The mechanical
durability is a measure of the resistance of compressed fuels towards shocks and/or abrasion as a
consequence of handling and transportation.
2 Normative references
The following documents are refer
...