Solid biofuels - Fuel specifications and classes - Part 2: Graded wood pellets (ISO 17225-2:2021)

This document determines the fuel quality classes and specifications of graded wood pellets for nonindustrial
and industrial use. This document covers only wood pellets 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.
Thermally treated biomass pellets (e.g. torrefied pellets) are not included in the scope of this document.

Biogene Festbrennstoffe - Brennstoffspezifikationen und klassen - Teil 2: Klassifizierung von Holzpellets (ISO 17225 2:2021)

Dieses Dokument legt die qualitätsbezogenen Brennstoffklassen und -spezifikationen für klassifizierte Holzpellets für nichtindustrielle und industrielle Verwendung fest. Dieses Dokument umfasst nur Holzpellets, 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.
Thermisch behandelte Pellets aus Biomasse (z. B. torrefizierte Pellets) fallen nicht in den Anwendungsbereich dieses Dokuments.

Biocombustibles solides - Classes et spécifications des combustibles - Partie 2: Classes de granulés de bois (ISO 17225-2:2021)

Trdna biogoriva - Specifikacije goriv in razredi - 2. del: Razvrstitev lesnih peletov (ISO 17225-2:2021)

General Information

Status
Published
Public Enquiry End Date
03-May-2020
Publication Date
12-Jul-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
09-Jun-2021
Due Date
14-Aug-2021
Completion Date
13-Jul-2021

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SLOVENSKI STANDARD
SIST EN ISO 17225-2:2021
01-september-2021
Nadomešča:
SIST EN ISO 17225-2:2014

Trdna biogoriva - Specifikacije goriv in razredi - 2. del: Razvrstitev lesnih peletov

(ISO 17225-2:2021)

Solid biofuels - Fuel specifications and classes - Part 2: Graded wood pellets (ISO 17225

-2:2021)

Biogene Festbrennstoffe - Brennstoffspezifikationen und klassen - Teil 2: Klassifizierung

von Holzpellets (ISO 17225 2:2021)

Biocombustibles solides - Classes et spécifications des combustibles - Partie 2: Classes

de granulés de bois (ISO 17225-2:2021)
Ta slovenski standard je istoveten z: EN ISO 17225-2:2021
ICS:
75.160.40 Biogoriva Biofuels
SIST EN ISO 17225-2:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 17225-2:2021
---------------------- Page: 2 ----------------------
SIST EN ISO 17225-2:2021
EN ISO 17225-2
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2021
EUROPÄISCHE NORM
ICS 27.190; 75.160.40 Supersedes EN ISO 17225-2:2014
English Version
Solid biofuels - Fuel specifications and classes - Part 2:
Graded wood pellets (ISO 17225-2:2021)

Biocombustibles solides - Classes et spécifications des Biogene Festbrennstoffe - Brennstoffspezifikationen

combustibles - Partie 2: Classes de granulés de bois und klassen - Teil 2: Klassifizierung von Holzpellets

(ISO 17225-2:2021) (ISO 17225 2:2021)
This European Standard was approved by CEN on 24 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 17225-2:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 17225-2:2021
EN ISO 17225-2:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 17225-2:2021
EN ISO 17225-2:2021 (E)
European foreword

This document (EN ISO 17225-2:2021) 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 November 2021, and conflicting national standards

shall be withdrawn at the latest by November 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 17225-2:2014.

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 17225-2:2021 has been approved by CEN as EN ISO 17225-2:2021 without any

modification.
---------------------- Page: 5 ----------------------
SIST EN ISO 17225-2:2021
---------------------- Page: 6 ----------------------
SIST EN ISO 17225-2:2021
INTERNATIONAL ISO
STANDARD 17225-2
Second edition
2021-05
Solid biofuels — Fuel specifications
and classes —
Part 2:
Graded wood pellets
Biocombustibles solides — Classes et spécifications des
combustibles —
Partie 2: Classes de granulés de bois
Reference number
ISO 17225-2:2021(E)
ISO 2021
---------------------- Page: 7 ----------------------
SIST EN ISO 17225-2:2021
ISO 17225-2:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© 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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 17225-2:2021
ISO 17225-2:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Symbols and abbreviated terms ........................................................................................................................................................... 3

5 Specification of graded wood pellets ............................................................................................................................................... 4

Bibliography ................................................................................................................................................................................................................................ 9

© ISO 2021 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 17225-2:2021
ISO 17225-2:2021(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 17225-2:2014), which has been technically

revised. The main changes compared to the previous edition are as follows:

— ash melting behaviour as normative and threshold values for DT temperature added for Table 1

— maximum value for bulk density added for Table 1
— particle density and coarse pellet fines added as informative
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
---------------------- Page: 10 ----------------------
SIST EN ISO 17225-2:2021
ISO 17225-2:2021(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 solid biofuels; to enable good understanding

between seller and buyer as well as a tool for communication with equipment manufacturers. It also

facilitates authority permission procedures and reporting.

This document supports the use of graded wood pellets for residential, small commercial and public

buildings as well as industrial energy generation applications, which require classified pellet quality.

The residential, small and 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 and populated districts.

NOTE 1 Pellets produced according to this document can be used in pellet stoves, which are tested according to

[1] [2]

European Standard EN 14785 , pellet burners tested according to EN 15270 and pellet boilers or integrated-

[3]
pellet burner systems tested according to EN 303–5 .
NOTE 2 For individual contracts, ISO 17225-1 can be used.

Although this document may 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 these standards.
© ISO 2021 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 17225-2:2021
---------------------- Page: 12 ----------------------
SIST EN ISO 17225-2:2021
INTERNATIONAL STANDARD ISO 17225-2:2021(E)
Solid biofuels — Fuel specifications and classes —
Part 2:
Graded wood pellets
1 Scope

This document determines the fuel quality classes and specifications of graded wood pellets for non-

industrial and industrial use. This document covers only wood pellets 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.

Thermally treated biomass pellets (e.g. torrefied pellets) are not included in the scope of this document.

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 14780, Solid biofuels — Sample preparation
ISO 16559, Solid biofuels — Terminology, definitions and descriptions

ISO 16948, Solid biofuels — Determination of total content of carbon, hydrogen and nitrogen

ISO 16968, Solid biofuels — Determination of minor elements

ISO 16994, Solid biofuels — Determination of total content of sulfur and chlorine

ISO 17225-1:2021, Solid biofuels — Fuel specifications and classes — Part 1: General requirements

ISO 17828, Solid biofuels — Determination of bulk density
ISO 17829, Solid Biofuels — Determination of length and diameter of pellets
ISO 17830, Solid biofuels — Particle size distribution of disintegrated pellets

ISO 17831-1, Solid biofuels — Determination of mechanical durability of pellets and briquettes — Part 1:

Pellets
ISO 18122, Solid biofuels — Determination of ash content
ISO 18125, Solid biofuels — Determination of calorific value

ISO 18134-1, Solid biofuels — Determination of moisture content — Oven dry method — Part 1: Total

moisture — Reference method

ISO 18134-2, Solid biofuels — Determination of moisture content — Oven dry method — Part 2: Total

moisture — Simplified method
ISO 18135, Solid Biofuels — Sampling
© ISO 2021 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 17225-2:2021
ISO 17225-2:2021(E)
ISO 21404, Solid biofuels — Determination of ash melting behaviour

ISO 21945, Solid biofuels — Simplified sampling method for small scale applications

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 16559 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
additive

material which has been intentionally introduced into the fuel feed stock to improve quality of fuel (e.g.

combustion or durability properties), to reduce emissions or to make production more efficient

Note 1 to entry: Trace amounts of e.g. grease or other lubricants that are introduced into the fuel processing

stream as part of normal mill operations are not considered as additives.
3.2
biofuel pellet

densified biofuel made with or without additives (3.1) usually with a cylindrical form, random length

typically 5 mm to 40 mm and diameter up to 25 mm and broken ends, produced by compressing biomass

Note 1 to entry: Usually the biomass has been milled before densification.

Note 2 to entry: See also non-woody pellet, wood pellet and pellet from thermally treated biomass.

3.3
chemical treatment
any treatment with chemicals other than air, water or heat
EXAMPLE Glue and paint.
Note 1 to entry: Examples of chemical treatment are listed in ISO 17225-1.
3.4
coarse pellet fines
CPF

particles with a size ranging from ≥ 3,15 mm to < 5,6 mm resulting from breakage of pellets during

production or handling
3.5
commercial application

facility that utilizes solid biofuel burning appliances or equipment that have similar fuel requirements

as residential appliances

Note 1 to entry: Commercial applications should not be confused with industrial applications, which can utilize a

much wider array of materials and have vastly different fuel requirements.
3.6
fines
fraction of small sized particles as defined by a specification or end-user

Note 1 to entry: In the solid biofuels standards fines are always defined as particles passing through a 3,15 mm

round hole sieve.
2 © ISO 2021 – All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 17225-2:2021
ISO 17225-2:2021(E)
3.7
woody biomass

biomass originating from trees, bushes and shrubs together with their fruit, leaves and needles inherent

to the biomass
Note 1 to
...

SLOVENSKI STANDARD
oSIST prEN ISO 17225-2:2019
01-april-2020

Trdna biogoriva - Specifikacije goriv in razredi - 2. del: Razvrstitev lesnih peletov

(ISO/DIS 17225-2:2020)

Solid biofuels - Fuel specifications and classes - Part 2: Graded wood pellets (ISO/DIS

17225-2:2020)

Biogene Festbrennstoffe - Brennstoffspezifikationen und -klassen - Teil 2: Klassifizierung

von Holzpellets (ISO/DIS 17225-2:2020)

Biocombustibles solides - Classes et spécifications des combustibles - Partie 2: Classes

de granulés de bois (ISO/DIS 17225-2:2020)
Ta slovenski standard je istoveten z: prEN ISO 17225-2
ICS:
75.160.40 Biogoriva Biofuels
oSIST prEN ISO 17225-2:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN ISO 17225-2:2019
---------------------- Page: 2 ----------------------
oSIST prEN ISO 17225-2:2019
DRAFT INTERNATIONAL STANDARD
ISO/DIS 17225-2
ISO/TC 238 Secretariat: SIS
Voting begins on: Voting terminates on:
2020-02-13 2020-05-07
Solid biofuels — Fuel specifications and classes —
Part 2:
Graded wood pellets
Biocombustibles solides — Classes et spécifications des combustibles —
Partie 2: Classes de granulés de bois
ICS: 27.190; 75.160.40
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
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 17225-2:2020(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 2020
---------------------- Page: 3 ----------------------
oSIST prEN ISO 17225-2:2019
ISO/DIS 17225-2:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© 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.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 17225-2:2019
ISO/DIS 17225-2:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Symbols and abbreviated terms ........................................................................................................................................................... 3

5 Specification of graded wood pellets ............................................................................................................................................... 3

Bibliography ................................................................................................................................................................................................................................ 9

© ISO 2020 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 17225-2:2019
ISO/DIS 17225-2:2020(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

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 17225-2:2014), which has been technically

revised.
The main changes compared to the previous edition are as follows:

— ash melting behaviour as normative and threshold values for DT temperature added for Table 1

— maximum value for bulk density added for Table 1
— particle density and fractioned pellets added as informative
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 2020 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 17225-2:2019
ISO/DIS 17225-2:2020(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 solid biofuels; to enable good understanding

between seller and buyer as well as a tool for communication with equipment manufacturers. It also

facilitates authority permission procedures and reporting.

This part of ISO 17225 supports the use of graded wood pellets for residential, small commercial and

public buildings as well as industrial energy generation applications, which require classified pellet

quality.

The residential, small and 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 and populated districts.

NOTE 1 Pellets produced according to this part of ISO 17225 may be used in pellet stoves, which are tested

[1], [2]

according to European Standard EN 14785 pellet burners tested according to EN 15270 and pellet boilers or

[3].
integrated-pellet burner systems tested according to EN 303–5
NOTE 2 For individual contracts, ISO 17225-1 can be used.

Although these product standards may 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 these standards.
© ISO 2020 – All rights reserved v
---------------------- Page: 7 ----------------------
oSIST prEN ISO 17225-2:2019
---------------------- Page: 8 ----------------------
oSIST prEN ISO 17225-2:2019
DRAFT INTERNATIONAL STANDARD ISO/DIS 17225-2:2020(E)
Solid biofuels — Fuel specifications and classes —
Part 2:
Graded wood pellets
1 Scope

This part of ISO 17225 determines the fuel quality classes and specifications of graded wood pellets for

non-industrial and industrial use. This part of ISO 17225 covers only wood pellets produced from the

following raw materials (see ISO 17225-1, 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.

Thermally treated biomass pellets (e.g. torrefied pellets) are not included in the scope of this part of

ISO 17225. Torrefaction is a mild pre-treatment of biomass at a temperature between 200 °C to 300 °C.

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 14780, Solid biofuels — Sample preparation
ISO 16559, Solid biofuels — Terminology, definitions and descriptions

ISO 16948, Solid biofuels — Determination of total content of carbon, hydrogen and nitrogen

ISO 16968, Solid biofuels — Determination of minor elements

ISO 16993, Solid biofuels — Conversion of analytical results from one basis to another

ISO 16994, Solid biofuels — Determination of total content of sulfur and chlorine

ISO 17225-1, Solid biofuels — Fuel specifications and classes — Part 1: General requirements

ISO 17827-1, Solid biofuels — Determination of particle size distribution for uncompressed fuels — Part 1:

Oscillating screen method using sieves with apertures of 3,15 mm and above
ISO 17828, Solid biofuels — Determination of bulk density
ISO 17829, Solid Biofuels — Determination of length and diameter of pellets
ISO 17830, Solid biofuels — Particle size distribution of disintegrated pellets

ISO 17831-1, Solid biofuels — Determination of mechanical durability of pellets and briquettes —

Part 1: Pellets
ISO 18122, Solid biofuels — Determination of ash content
ISO 18125, Solid biofuels — Determination of calorific value
© ISO 2020 – All rights reserved 1
---------------------- Page: 9 ----------------------
oSIST prEN ISO 17225-2:2019
ISO/DIS 17225-2:2020(E)

ISO 18134-1, Solid biofuels — Determination of moisture content — Oven dry method — Part 1: Total

moisture — Reference method

ISO 18134-2, Solid biofuels — Determination of moisture content — Oven dry method — Part 2: Total

moisture — Simplified method
ISO 18135, Solid Biofuels — Sampling

ISO 18846-1, Solid biofuels — Determination of fines content — Part 1: Reference method

ISO 18846-2, Solid biofuels — Determination of fines content — Part 2: Simplified method

ISO 18847, Solid biofuels — Determination of particle density of pellets and briquettes

ISO 21404, Solid biofuels — Determination of ash melting behaviour

ISO 21945, Solid biofuels — Simplified sampling method for small scale applications

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 16559 and the following

terms and definitions 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
wood pellet

densified biofuel made from woody biomass with or without additives usually with a cylindrical form,

random length typically 5 to 40 mm and diameter up to 25 mm and broken ends

Note 1 to entry: The raw material for wood pellets is woody biomass in accordance with Table 1 of ISO 17225-1.

Pellets are usually manufactured in a die, with total moisture content usually less than 10 % of their mass on

wet basis.

Note 2 to entry: The woody biomass used as feedstock for pellet making is milled to size in accordance with

customer specification. Determination of the particle size distribution of the constituents of pellets is done by

ISO 17830.
3.2
additive

material which has been intentionally introduced into the fuel feed stock to improve quality of fuel (e.g.

combustion properties), to reduce emissions or to make production more efficient

Note 1 to entry: Trace amounts of e.g. grease or other lubricants that are introduced into the fuel processing

stream as part of normal mill operations are not considered as additives.
3.3
chemical treatment
any treatment with chemicals other than air, water or heat
...

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