EN ISO 17225-3:2021

Solid biofuels - Fuel specifications and classes - Part 3: Graded wood briquettes (ISO 17225-3:2021)

This document determines the fuel quality classes and specifications of graded wood briquettes. This document covers only wood briquettes produced from the following raw materials (see ISO 17225‑1: 2021, Table 1):
1.1 Forest, plantation and other virgin wood
1.2 By-products and residues from wood processing industry
1.3.1 Chemically untreated used wood
NOTE     Thermally treated biomass briquettes (e.g. torrefied briquettes) are not included in the scope of this document.

Biogene Festbrennstoffe - Brennstoffspezifikationen und -klassen - Teil 3: Klassifizierung von Holzbriketts (ISO 17225-3:2021)

Dieses Dokument legt die qualitätsbezogenen Brennstoffklassen und  spezifikationen für klassifizierte Holzbriketts fest. Dieses Dokument umfasst nur Holzbriketts, die aus folgenden Rohmaterialien hergestellt wurden (siehe ISO 17225 1:2021, Tabelle 1):
- 1.1 Wald- und Plantagenholz sowie anderes naturbelassenes Holz;
- 1.2 Industrie-Restholz;
- 1.3.1 Chemisch unbehandeltes Gebrauchtholz.
ANMERKUNG   Thermisch behandelte Briketts aus Biomasse (z. B. torrefizierte Briketts) fallen nicht in den An-wendungsbereich dieses Dokumentes.

Biocombustibles solides - Classes et spécifications des combustibles - Partie 3: Classes de briquettes de bois (ISO 17225-3:2021)

Le présent document détermine les classes et spécifications de qualité du combustible pour des briquettes de bois. Le présent document couvre uniquement les briquettes de bois produites à partir des matières premières suivantes (voir ISO 17225‑1:2021, Tableau 1):
1.1 bois de forêt, de plantation et autres matériaux ligneux vierges;
1.2 produits dérivés et sous-produits de l'industrie de transformation du bois;
1.3.1 bois usagé non traité chimiquement.
NOTE       Les briquettes de biomasse traitée thermiquement (par exemple, briquettes torréfiées) ne sont pas comprises dans le domaine d'application du présent document.

Trdna biogoriva - Specifikacije goriv in razredi - 3. del: Razvrstitev lesnih briketov (ISO 17225-3:2021)

General Information

• Status: Published
• Publication Date: 09-Mar-2021
• Withdrawal Date: 29-Sep-2021
• ICS: 27.190 - Biological sources and alternative sources of energy
• ICS: 75.160.40 - Biofuels
• Technical Committee: CEN/TC 335 - Solid biofuels
• Drafting Committee: CEN/TC 335 - Solid biofuels
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 10-Mar-2021
• Completion Date: 10-Mar-2021
• Ref Project: SIST EN ISO 17225-3:2021 - Solid biofuels - Fuel specifications and classes - Part 3: Graded wood briquettes (ISO 17225-3:2021)

Relations

• Replaces: EN ISO 17225-3:2014 - Solid biofuels - Fuel specifications and classes - Part 3: Graded wood briquettes (ISO 17225-3:2014)
• Effective Date: 08-Jun-2022

Overview

EN ISO 17225-3:2021 - "Solid biofuels - Fuel specifications and classes - Part 3: Graded wood briquettes" (CEN/ISO) defines fuel quality classes and specification rules for graded wood briquettes. The standard covers briquettes made from:

• forest, plantation and other virgin wood (1.1)
• by‑products and residues from the wood processing industry (1.2)
• chemically untreated used wood (1.3.1)

Thermally treated briquettes (e.g., torrefied briquettes) are explicitly excluded. EN ISO 17225-3:2021 is intended to support clear trading, procurement and appliance compatibility for residential, small commercial and public building heating applications.

Key Topics and Requirements

• Fuel quality classes: Defines property classes (notably A1, A2, B) with A1 representing low-ash, low-nitrogen virgin wood, A2 slightly higher ash/N, and B allowing certain industrial residues and untreated used wood provided they do not contain heavy metals or halogenated organic compounds from preservatives/coatings.
• Specified properties: Requires declaration or verification of key fuel properties such as moisture, ash content, calorific value (net calorific value), particle density, length/diameter, and chemical elements (e.g., sulfur, chlorine, nitrogen, minor elements).
• Sampling and analysis: Sampling, sample preparation and test methods are referenced to established ISO standards (e.g., ISO 18135, ISO 14780, ISO 18134‑1/2, ISO 18125, ISO 16994, ISO 16948). Producers can use previous measured values, calculated typical values or perform laboratory analysis (simplified or reference methods).
• Producer/supplier responsibilities: The standard stresses accurate, transparent declarations of raw material origin and fuel properties. Where chemically treated raw materials are used, origin and any treatments must be clearly described.
• Dimensional and physical requirements: Specifies briquette geometry and particle density standards to ensure appliance compatibility.

Applications and Who Uses It

• Manufacturers and suppliers: To classify products, set quality control and provide compliant product declarations for trade.
• Heating equipment manufacturers and installers: To verify fuel compatibility with stoves, boilers and fireplaces and ensure appliance performance and emissions targets.
• Test laboratories and certification bodies: For sampling and laboratory testing against referenced ISO methods.
• Specifiers, purchasers and regulators: For procurement specifications, building code compliance and environmental reporting.
• Typical applications include residential stoves, room heaters, small commercial heating and boiler systems where higher fuel quality is required due to limited flue-gas cleaning and simpler appliance controls.

Related Standards

• ISO 17225-1 (General requirements for solid biofuels)
• ISO 14780, ISO 18135 (sampling/sample prep)
• ISO 18134‑1/2 (moisture), ISO 18125 (calorific value), ISO 18122 (ash), ISO 16994/16948 (chemical analysis)
• EN standards for appliances (e.g., EN 13240, EN 303‑5) - referenced for appliance compatibility

EN ISO 17225-3:2021 is essential for clear, reliable fuel specifications, supporting trade, quality assurance and safe, low‑emission use of graded wood briquettes.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2021
Nadomešča:
SIST EN ISO 17225-3:2014
Trdna biogoriva - Specifikacije goriv in razredi - 3. del: Razvrstitev lesnih briketov
(ISO 17225-3:2021)
Solid biofuels - Fuel specifications and classes - Part 3: Graded wood briquettes (ISO
17225-3:2021)
Biogene Festbrennstoffe - Brennstoffspezifikationen und -klassen - Teil 3: Klassifizierung
von Holzbriketts (ISO 17225-3:2021)
Biocombustibles solides - Classes et spécifications des combustibles - Partie 3: Classes
de briquettes de bois (ISO 17225-3:2021)
Ta slovenski standard je istoveten z: EN ISO 17225-3:2021
ICS:
75.160.40 Biogoriva Biofuels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 17225-3
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2021
EUROPÄISCHE NORM
ICS 27.190; 75.160.40 Supersedes EN ISO 17225-3:2014
English Version
Solid biofuels - Fuel specifications and classes - Part 3:
Graded wood briquettes (ISO 17225-3:2021)
Biocombustibles solides - Classes et spécifications des Biogene Festbrennstoffe - Brennstoffspezifikationen
combustibles - Partie 3: Classes de briquettes de bois und -klassen - Teil 3: Klassifizierung von Holzbriketts
(ISO 17225-3:2021) (ISO 17225-3:2021)
This European Standard was approved by CEN on 8 January 2021.

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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17225-3:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 17225-3:2021) has been prepared by Technical Committee ISO/TC 238 "Solid
biofuels" in collaboration with Technical Committee CEN/TC 335 “Solid biofuels” 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 September 2021, and conflicting national standards
shall be withdrawn at the latest by September 2021.
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 17225-3:2014.
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 17225-3:2021 has been approved by CEN as EN ISO 17225-3:2021 without any
modification.
INTERNATIONAL ISO
STANDARD 17225-3
Second edition
2021-02
Solid biofuels — Fuel specifications
and classes —
Part 3:
Graded wood briquettes
Biocombustibles solides — Classes et spécifications des
combustibles —
Partie 3: Classes de briquettes de bois
Reference number
ISO 17225-3:2021(E)
©
ISO 2021
ISO 17225-3:2021(E)
© ISO 2021
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 2021 – All rights reserved

ISO 17225-3:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 2
5 Specification of graded wood briquettes. 3
Bibliography . 7
ISO 17225-3:2021(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
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 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 238, Solid biofuels.
This second edition cancels and replaces the first edition (ISO 17225-3:2014), which has been technically
revised. The main changes compared to the previous edition are as follows:
— raw material basis enlarged
— values for chemical properties changed
A list of all parts in the ISO 17225 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 2021 – All rights reserved

ISO 17225-3:2021(E)
Introduction
The objective of the ISO 17225 series is to provide unambiguous and clear classification principles for
solid biofuels; to serve as a tool to enable efficient trading of biofuels; to enable good understanding
between seller and buyer as well as a tool for communication with equipment manufacturers. It will
also facilitate authority permission procedures and reporting.
This document supports the use of graded wood briquettes for residential, small commercial and public
building applications.
The residential, small commercial and public building applications require higher quality fuel for the
following reasons:
— Small-scale equipment does not usually have advanced controls and flue gas cleaning
— Appliances are not generally managed by professional heating engineers
— Appliances are often located in residential districts
NOTE 1 Wood briquettes produced according to this document can be used in stoves, fireplaces, cookers,
[1]
roomheaters and multifired sauna stoves, which are tested according to European standards EN 13229 ,
[2] [3] [4] [5] [6]
EN 12815 , EN 12809 , EN 13240 , EN 15250 and EN 15821 , and boilers systems tested according to
[7]
EN 303–5 .
NOTE 2 For individual contracts ISO 17225-1 can be used.
Although this document can be obtained separately, they require a general understanding of the
standards based on and supporting ISO 17225-1. It is recommended to obtain and use ISO 17225-1 in
conjunction with this document.
INTERNATIONAL STANDARD ISO 17225-3:2021(E)
Solid biofuels — Fuel specifications and classes —
Part 3:
Graded wood briquettes
1 Scope
This document determines the fuel quality classes and specifications of graded wood briquettes.
This document covers only wood briquettes produced from the following raw materials (see
ISO 17225-1: 2021, Table 1):
— 1.1 Forest, plantation and other virgin wood
— 1.2 By-products and residues from wood processing industry
— 1.3.1 Chemically untrea
...