ISO/FDIS 18708

Solid recovered fuels — Determination of bulk density

This international standard defines a method of determining bulk density of solid recovered fuels by the use of a standard measuring container.

Combustibles solides de récupération — Détermination de la masse volumique apparente

General Information

• Status: Not Published
• ICS: 75.160.10 - Solid fuels
• Technical Committee: ISO/TC 300 - Solid recovered materials, including solid recovered fuels
• Drafting Committee: ISO/TC 300 - Solid recovered materials, including solid recovered fuels
• Current Stage: 5000 - FDIS registered for formal approval
• Start Date: 06-May-2025
• Completion Date: 05-May-2025

Relations

• Consolidates: ISO/TR 20896-2:2023 - Dentistry — Digital impression devices — Part 2: Methods for assessing accuracy for implanted devices
• Effective Date: 29-Oct-2022

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/TC 300
Solid recovered fuels —
Secretariat: SFS
Determination of bulk density
Voting begins on:
Combustibles solides de récupération — Détermination de la 2025-07-10
masse volumique apparente
Voting terminates on:
2025-09-04
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 SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/CEN PARALLEL PROCESSING LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 300
Solid recovered fuels —
Secretariat: SFS
Determination of bulk density
Voting begins on:
Combustibles solides de récupération — Détermination de la
masse volumique apparente
Voting terminates on:
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 SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
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 Reference number
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
5.1 Measurement containers .2
5.1.1 General .2
5.1.2 Large container.2
5.1.3 Medium container .2
5.1.4 Small container .3
5.2 Scale/Balances .3
5.2.1 Scale/Balance 1 .3
5.2.2 Scale/Balance 2 .3
5.3 Scantling .3
5.4 Wooden board .4
6 Sampling and sample preparation . 4
7 Operation . 4
7.1 Determination of the container volume .4
7.2 Combination of container size and dropping height .4
7.2.1 General .4
7.2.2 Fluff .4
7.2.3 Pellet .5
7.3 Measurement procedure .5
8 Calculation of bulk density . 6
8.1 Calculation of bulk density as received .6
8.2 Calculation of bulk density of dry matter .6
9 Performance characteristics . 6
9.1 General .6
9.2 Repeatability limit .6
9.3 Reproducibility limit .6
10 Test reports . 7
Annex A (informative) Example of an apparatus for controlled shock exposure . 8
Annex B (informative) Results of interlaboratory test . 9
Annex C (informative) Report of experimental study on the determination of bulk density .10
Annex D (informative) Environmental aspects .22
Bibliography .24

iii
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 300, Solid recovered materials, including
solid recovered fuels. in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 343, Solid recovered materials, including solid recovered fuels, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
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
Introduction
Bulk density is one of the main quality parameters of solid recovered fuels (SRF). It is needed e.g. in a
sampling process (volume of sampling tools, volume primary sample), in assessing transport capacity or
storage space required or energy density (MWh/m ) of SRF. Bulk density is not an absolute value, therefore
conditions for its determination are standardised in order to gain comparative measuring results.
This document describes the testing method for determining the bulk density of SRFs to produce solidified
fuels from the combustibles in waste by processing, such as compressing, drying, crushing, moulding and
solidifying, and utilize them as an energy source.

v
FINAL DRAFT International Standard ISO/FDIS 18708:2025(en)
Solid recovered fuels — Determination of bulk density
1 Scope
This document specifies a method for determining the bulk density of solid recovered fuels (SRF) by the use
of a standard measuring container. This method is applicable to all SRFs with a nominal top size of particle
less than 1/3 of the container diameter specified in 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 21637, Solid recovered fuels — Vocabulary
ISO 21645, Solid recovered fuels — Methods
...

ISO /TC 300/WG 4
Secretariat: SFS
Date: 2025-04-2906-25
Solid recovered fuels — Determination of bulk density
Combustibles solides de récupération — Détermination de la masse volumique apparente
FDIS stage
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
EmailE-mail: [e-mail]
Website: www.iso.orgwww.iso.org
Published in Switzerland
ii
Contents
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
6 Sampling and sample preparation . 4
7 Operation . 4
8 Calculation of bulk density . 6
9 Performance characteristics. 7
10 Test reports . 8
Annex A (informative) Example of an apparatus for controlled shock exposure . 9
Annex B (informative) Results of interlaboratory test . 11
Annex C (informative) Report of experimental study on the determination of bulk density . 12
Annex D (informative) Environmental aspects . 30
Bibliography . 33

Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
5.1 Measurement containers . 2
5.1.1 General . 2
5.1.2 Large container . 2
5.1.3 Medium container . 2
5.1.4 Small container . 3
5.2 Scale/Balances . 3
5.2.1 Scale/Balance 1 . 3
5.2.2 Scale/Balance 2 . 3
5.3 Scantling . 4
5.4 Wooden board . 4
6 Sampling and sample preparation . 4
7 Operation . 4
7.1 Determination of the container volume . 4
7.2 Combination of container size and dropping height . 4
7.2.1 General . 4
iii
7.2.2 Fluff . 4
7.2.3 Pellet . 5
7.3 Measurement procedure . 5
8 Calculation of bulk density . 6
8.1 Calculation of bulk density as received . 6
8.2 Calculation of bulk density of dry matter . 6
9 Performance characteristics. 7
9.1 General . 7
9.2 Repeatability limit . 7
9.3 Reproducibility limit . 7
10 Test reports . 7
Annex A (informative) Example of an apparatus for controlled shock exposure . 8
Annex B (informative) Results of interlaboratory test . 9
Annex C (informative) Report of experimental study on the determination of bulk density . 10
Annex D (informative) . 22
Bibliography . 24

iv
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.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.htmlwww.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 300, Solid recovered materials, including solid
recovered fuels. in collaboration with the European Committee for Standardization (CEN) Technical Committee
CEN/TC 343, Solid recovered materials, including solid recovered fuels, in accordance with the Agreement on
technical cooperation between ISO and CEN (Vienna Agreement).
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.
Field Code Changed
v
Introduction
Bulk density is one of the main quality parameters of solid recovered fuels (SRF). It is needed e.g. in a sampling
process (volume of sampling tools, volume primary sample), in assessing transport capacity or storage space
required or energy density (MWh/m ) of SRF. Bulk density is not an absolute value, therefore conditions for
its determination are standardised in order to gain comparative measuring results.
This document describes the testing method for determining the bulk density of SRFs to produce solidified
fuels from the combustibles in waste by processing, such as compressing, drying, crushing, moulding and
solidifying, and utilize them as an energy source.
vi
DRAFT International Standard ISO/FDIS 18708:2025(en)

Solid recovered fuels — Determination of bulk density
1 Scope
This document specifies a method for determining the bulk density of solid recovered fuels (SRF) by the use
of a standard measuring container. This method is applicable to all SRFs with a nominal top size of particle
less than 1/3 of the container diameter specified in 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 21637, Solid recovered fuels — Vocabulary
ISO 21645, Solid recovered fuels — Methods for sampling
ISO 21646, Solid recovered fuels — Sample preparation
ISO 21660-3, Solid recovered fuels — Determination of moisture content using the oven dry method — Part 3:
Moisture in general analysis sample
EN 15415-1, Solid recovered fuels — Determination of particle size distribution - Screen method for small
dimension particles
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 21637 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
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