Solid biofuels - Determination of content of heavy extraneous materials larger than 3,15 mm (ISO 19743:2026)

This document specifies a method for the determination of the content of heavy extraneous materials (HEM) 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        Some heavy extraneous materials (e.g. 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.

Biogene Festbrennstoffe - Bestimmung des Gehaltes an schweren Fremdstoffen mit einer Partikelgröße von mehr als 3,15 mm (ISO 19743:2026)

Biocombustibles solides - Détermination de la teneur en matériaux lourds exogènes de dimension supérieure à 3,15 mm (ISO 19743:2026)

Le présent document 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, et en particulier au broyat de bois conformément à l’ISO 17225-9.
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.
NOTE 3        Certains matériaux lourds exogènes (par exemple des morceaux d’argile) peuvent se désagréger lorsqu’ils sont immergés dans l’eau.
NOTE 4        Les matériaux lourds exogènes de dimension inférieure à 3,15 mm peuvent endommager l’équipement de découpe utilisé pour réduire la taille du matériau en vue de produire des échantillons pour laboratoire.

Trdna biogoriva - Določanje težkih tujih snovi, večjih od 3,15 mm (ISO 19743:2026)

General Information

Status
Published
Public Enquiry End Date
12-May-2025
Publication Date
10-Mar-2026
Technical Committee
AGO - Refuse derived fuel
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
16-Feb-2026
Due Date
23-Apr-2026
Completion Date
11-Mar-2026

Relations

Effective Date
01-Apr-2026
Effective Date
11-Mar-2026
Effective Date
28-Jan-2026

Overview

FprEN ISO 19743 / ISO/DIS 19743:2025 specifies a laboratory method for measuring the content of heavy extraneous materials (HEM) larger than 3.15 mm in solid biofuels. The method uses sink-and-float separation combined with elutriation in water and reports HEM as a percentage on a dry‑weight basis. It is applicable to woody biomass in accordance with ISO 17225‑1 and is particularly relevant for hogfuel (ISO 17225‑9).

Key topics and technical requirements

  • Scope: Determines heavy materials > 3.15 mm with specific density > 1 g/cm3 (e.g., stones, glass, metal, some plastics); lighter materials (≤ 1 g/cm3) can be hand‑sorted.
  • Minimum test sample: 20 L, obtained and prepared per ISO 18135 / ISO 21945 and ISO 14780; divided into four equal sub‑portions (one for moisture).
  • Apparatus:
    • Water container: ≥ 30 L, smooth, cylindrical/conical, height/diameter ratio 1.0–1.3, volume ≥ 150% of sample volume.
    • Sieves: 3.15 mm perforated metal plate per ISO 3310‑2.
    • Balances: one reading to 1 g, another to 0.1 g.
    • Drying oven: controlled at (105 ± 2) °C with 3–5 air changes/h.
    • Non‑corrodible trays/dishes with low adsorption.
  • Procedure highlights:
    • Weigh test portion to nearest 1 g.
    • Submerge and stir sample in water for at least 30 s, rest ≈5 s to let heavy particles sink.
    • Remove floating biogenic particles, pour off suspended material, repeat rinse at least twice.
    • Collect sediment on 3.15 mm sieve, rinse away fines, dry to constant mass.
    • Constant mass: change ≤ 0.2% of initial sediment mass over 60 min at drying temperature.
  • Calculation and reporting: HEM content = (dry mass of retained HEM / dry mass of original sample) × 100; test report and performance characteristics are specified.

Applications and users

  • Ensures quality control of solid biofuels by quantifying damaging impurities that:
    • reduce calorific value,
    • increase ash and residue disposal costs,
    • cause wear or damage in milling and combustion equipment.
  • Primary users:
    • Analytical laboratories and quality control teams,
    • Biomass fuel producers and suppliers (hogfuel producers),
    • Power plants and industrial boilers,
    • Fuel traders, procurement officers, and regulators setting fuel acceptance criteria.

Related standards

  • ISO 3310‑2 (test sieves)
  • ISO 14780 (sample preparation)
  • ISO 16559 (vocabulary)
  • ISO 18134‑1 / ISO 18134‑2 (moisture determination)
  • ISO 18135, ISO 21945 (sampling)
  • ISO 17225‑1 / ISO 17225‑9 (fuel classification - woody biomass / hogfuel)

Keywords: solid biofuels, heavy extraneous materials, 3.15 mm, sink-and-float, elutriation, hogfuel, ISO 19743, biomass quality control.

Buy Documents

Standard

SIST EN ISO 19743:2026

English language (13 pages)
Preview
Preview
e-Library read for
1 day

Get Certified

Connect with accredited certification bodies for this standard

DNV

DNV is an independent assurance and risk management provider.

NA Norway Verified

Lloyd's Register

Lloyd's Register is a global professional services organisation specialising in engineering and technology.

UKAS United Kingdom Verified

ABS Quality Evaluations Inc.

American Bureau of Shipping quality certification.

ANAB United States Verified

Sponsored listings

Frequently Asked Questions

SIST EN ISO 19743:2026 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Solid biofuels - Determination of content of heavy extraneous materials larger than 3,15 mm (ISO 19743:2026)". This standard covers: This document specifies a method for the determination of the content of heavy extraneous materials (HEM) 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        Some heavy extraneous materials (e.g. 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.

This document specifies a method for the determination of the content of heavy extraneous materials (HEM) 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        Some heavy extraneous materials (e.g. 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.

SIST EN ISO 19743:2026 is classified under the following ICS (International Classification for Standards) categories: 27.190 - Biological sources and alternative sources of energy; 75.160.40 - Biofuels. The ICS classification helps identify the subject area and facilitates finding related standards.

SIST EN ISO 19743:2026 has the following relationships with other standards: It is inter standard links to SIST EN ISO 19743:2017, SIST ISO 3310-2:2015, SIST EN ISO 26101-2:2024. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

SIST EN ISO 19743:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


SLOVENSKI STANDARD
01-april-2026
Nadomešča:
SIST EN ISO 19743:2017
Trdna biogoriva - Določanje težkih tujih snovi, večjih od 3,15 mm (ISO 19743:2026)
Solid biofuels - Determination of content of heavy extraneous materials larger than 3,15
mm (ISO 19743:2026)
Biogene Festbrennstoffe - Bestimmung des Gehaltes an schweren Fremdstoffen mit
einer Partikelgröße von mehr als 3,15 mm (ISO 19743:2026)
Biocombustibles solides - Détermination de la teneur en matériaux lourds exogènes de
dimension supérieure à 3,15 mm (ISO 19743:2026)
Ta slovenski standard je istoveten z: EN ISO 19743:2026
ICS:
75.160.40 Biogoriva Biofuels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 19743
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2026
EUROPÄISCHE NORM
ICS 75.160.40 Supersedes EN ISO 19743:2017
English Version
Solid biofuels - Determination of content of heavy
extraneous materials larger than 3,15 mm (ISO
19743:2026)
Biocombustibles solides - Détermination de la teneur Biogene Festbrennstoffe - Bestimmung des Gehaltes an
en matériaux lourds exogènes de dimension schweren Fremdstoffen mit einer Partikelgröße von
supérieure à 3,15 mm (ISO 19743:2026) mehr als 3,15 mm (ISO 19743:2026)
This European Standard was approved by CEN on 12 January 2026.

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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19743:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 19743:2026) 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 August 2026, and conflicting national standards shall
be withdrawn at the latest by August 2026.
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 19743:2017.
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 19743:2026 has been approved by CEN as EN ISO 19743:2026 without any modification.

International
Standard
ISO 19743
Second edition
Solid biofuels — Determination
2026-01
of content of heavy extraneous
materials larger than 3,15 mm
Biocombustibles solides — Détermination de la teneur en
matériaux lourds exogènes de dimension supérieure à 3,15 mm
Reference number
ISO 19743:2026(en) © ISO 2026
ISO 19743:2026(en)
© ISO 2026
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 19743:2026(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 . 4
9 Performance characteristics . 4
10 Test report . 4
Bibliography . 5

iii
ISO 19743:2026(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 editio
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.

Loading comments...