oSIST prEN ISO 19743:2025
(Main)Solid biofuels - Determination of content of heavy extraneous materials larger than 3,15 mm (ISO/DIS 19743:2025)
Solid biofuels - Determination of content of heavy extraneous materials larger than 3,15 mm (ISO/DIS 19743:2025)
ISO 19743:2017 specifies a method for the determination of content of heavy extraneous materials larger than 3,15 mm by the use of sink-and-float separation combined with elutriation. This document is applicable to woody biomass in accordance with ISO 17225‑1:2014, Table 1.
Biogene Festbrennstoffe - Bestimmung des Gehaltes an schweren Fremdstoffen mit einer Partikelgröße von mehr als 3,15 mm (ISO/DIS 19743:2025)
Biocombustibles solides - Détermination de la teneur en matériaux lourds exogènes de dimension supérieure à 3,15 mm (ISO/DIS 19743:2025)
L'ISO 19743 :2017 spécifie une méthode de détermination de la teneur en matériaux lourds exogènes de dimension supérieure à 3,15 mm à l'aide d'une séparation par sédimentation et suspension avec élutriation. Le présent document est applicable à la biomasse ligneuse conformément à l'ISO 17225‑1:2014, Tableau 1.
NOTE 1 Cette méthode est conçue pour déterminer la teneur en impuretés de dimension supérieure à 3,15 mm et avec une masse volumique spécifique supérieure à 1 g/cm3 comme les pierres, le verre, le caoutchouc, le métal et certains types de matières plastiques.
NOTE 2 Lors du traitement de l'échantillon, un triage à la main des impuretés légères de masse volumique spécifique inférieure ou égale à 1 g/cm3 (par exemple une feuille plastique) peut également être effectué.
Trdna biogoriva - Določanje tujih snovi, večjih od 3,15 mm (ISO/DIS 19743:2025)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2025
Trdna biogoriva - Določanje tujih snovi, večjih od 3,15 mm (ISO/DIS 19743:2025)
Solid biofuels - Determination of content of heavy extraneous materials larger than 3,15
mm (ISO/DIS 19743:2025)
Biogene Festbrennstoffe - Bestimmung des Gehaltes an schweren Fremdstoffen mit
einer Partikelgröße von mehr als 3,15 mm (ISO/DIS 19743:2025)
Biocombustibles solides - Détermination de la teneur en matériaux lourds exogènes de
dimension supérieure à 3,15 mm (ISO/DIS 19743:2025)
Ta slovenski standard je istoveten z: prEN ISO 19743
ICS:
75.160.40 Biogoriva Biofuels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
International
Standard
ISO/DIS 19743
ISO/TC 238
Solid biofuels — Determination
Secretariat: SIS
of content of heavy extraneous
Voting begins on:
materials larger than 3,15 mm
2025-02-18
Biocombustibles solides — Détermination de la teneur en
Voting terminates on:
matériaux lourds exogènes de dimension supérieure à 3,15 mm
2025-05-13
ICS: 27.190; 75.160.40
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
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Reference number
ISO/DIS 19743:2025(en)
DRAFT
ISO/DIS 19743:2025(en)
International
Standard
ISO/DIS 19743
ISO/TC 238
Solid biofuels — Determination
Secretariat: SIS
of content of heavy extraneous
Voting begins on:
materials larger than 3,15 mm
Biocombustibles solides — Détermination de la teneur en
Voting terminates on:
matériaux lourds exogènes de dimension supérieure à 3,15 mm
ICS: 27.190; 75.160.40
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
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Published in Switzerland Reference number
ISO/DIS 19743:2025(en)
ii
ISO/DIS 19743:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
5.1 Water container .2
5.2 Balances .2
5.3 Sieve .2
5.4 Drying oven .2
5.5 Dishes or trays .2
6 Sample preparation . 2
7 Procedure . 3
8 Calculation . 3
9 Performance characteristics . 4
10 Test report . 4
Bibliography . 5
iii
ISO/DIS 19743:2025(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
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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
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www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 238, Solid biofuels and pyrogenic biocarbon.
iv
ISO/DIS 19743:2025(en)
Introduction
Determination of content of heavy extraneous materials larger than 3,15 mm is important when evaluating
the suitability of using biomass as biofuel. The presences of heavy extraneous materials lowers the energetic
value of the fuel and increases the residue after burning, thus increasing the costs of disposal.
Stones and other impurities contained in biomass from stumps, roots, mill residue and harvest and landscape
management residues may cause problems during size reduction, as well as during combustion.
Impurities smaller than 3,15 mm are not considered as part of this testing method but may still contribute
to the ash content.
The contents of heavy extraneous materials larger than 3,15 mm are not part of the ash content
Note 1 There are three main sources of heavy extraneous materials:
— They may be contained in the base material from which the biofuel (e.g. hog fuel) is produced
— They may inadvertently and unintentionally be added to the fuel while loading from the ground, by digging too low
— They may be residues from former loads in the transport vehicle
The last two categories of heavy extraneous materials cannot be determined by the method described below, because
it is unlikely that the incidental impurities can be found in the random sample on which this method is based. If such
incidental impurities are found during visual inspection of the delivered fuel, then this should be documented by
pictures and contact should be sought with the supplier to make sure that these incidents are avoided in the future.
The main changes in this revised standard are:
— The introduction has been enlarged with a specification of where heavy extraneous materials can enter
the fuel. It has also been elucidated that HEM most often are found in wood hogfuel.
— The procedure has been updated and clarified.
— The calculation has been updated
v
DRAFT International Standard ISO/DIS 19743:2025(en)
Solid biofuels — Determination of content of heavy
extraneous materials larger than 3,15 mm
1 Scope
This document specifies a method for the determination of content of heavy extraneous materials larger than
3,15 mm by the use of sink-and-float separation combined with elutriation. This document is applicable to
woody biomass in accordance with ISO 17225-1, and especially for hogfuel in accordance with ISO 17225-9.
NOTE 1 This method is designed to determine the level of impurities larger than 3,15 mm with a specific
density >1 g/cm3 such as stones, glass, rubber, metal and certain types of plastics.
NOTE 2 During the processing of the sample, hand sorting of light impurities with a specific density ≤1 g/cm3 (e.g.
plastic foil) can also be done.
NOTE 3 It should be noted that some heavy extraneous materials (f.e. lumps of clay) can fall apart when submerged
in water.
NOTE 4 Heavy extraneous materials smaller than 3,15 mm can damage milling equipment, when reducing the
material in size to produce laboratory samples.
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 3310-2, Test sieves — Technical requirements and testing — Part 2: Test sieves of perforated metal plate
ISO 14780, Solid biofuels — Sample preparation
ISO 16559, Solid biofuels — Vocabulary
ISO 18134-1, Solid biofuels — Determination of moisture content — Part 1: Reference method
ISO 18134-2, Solid biofuels — Determination of moisture content — Part 2: Simplified method
ISO 18135, Solid Biofuels — Sampling
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:
— IEC Electropedia: available at https:// www .electropedia .org/
— ISO Online browsing plat
...
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