SIST EN ISO 21660-3:2021

Solid recovered fuels - Determination of moisture content using the oven dry method - Part 3: Moisture in general analysis sample (ISO 21660-3:2021)

This document specifies a method for the determination of moisture in a general analysis sample by drying the sample in an oven. This method is suitable for use for general analysis samples in accordance with CEN/TS 15414‑1[3][1]. It is applicable to all solid recovered fuels.
If solid recovered fuels contain large amounts of oil-fractions the Karl-Fischer-Method (for example ISO 760) is advisable. Otherwise, a lower temperature is recommended (e.g. 50 °C ± 10 °C) and a longer drying time until constant mass is achieved.
NOTE  The term moisture content, when used with recovered materials, can be misleading since solid recovered materials, e. g. biomass, frequently contain varying amounts of volatile compounds (extractives) which can evaporate when determining the moisture content of the general analyses sample by oven drying.
[1]   The adoption of the standard series EN 15414 as standard series ISO 21660 is planned. ISO 21660‑3 is published in parallel at CEN level as EN 21660-3.

Feste Sekundärbrennstoffe - Bestimmung des Wassergehaltes unter Verwendung des Verfahrens der Ofentrocknung - Teil 3: Wassergehalt in gewöhnlichen Analysenproben (ISO 21660-3:2021)

Dieses Dokument legt ein Verfahren zur Bestimmung des Wassergehaltes in einer allgemeinen Analysenprobe durch Trocknen der Probe in einem Ofen fest. Das Verfahren ist für die Anwendung bei allgemeinen Analysenproben nach CEN/TS 15414 1 [3]  geeignet. Es gilt für alle festen Sekundärbrennstoffe.
Wenn feste Sekundärbrennstoffe große Mengen an Ölfraktionen enthalten, ist das Karl-Fischer-Verfahren (z. B. ISO 760) empfehlenswert. Andernfalls werden eine niedrigere Temperatur (z. B. 50 °C ± 10 °C) und eine längere Trocknungszeit empfohlen, bis eine konstante Masse erreicht ist.
ANMERKUNG Der Begriff Wassergehalt kann bei der Anwendung im Zusammenhang mit Sekundärrohstoffen irreführend sein, weil Sekundärrohstoffe, z. B. Biomasse, oft unterschiedliche Mengen an flüchtigen Verbindungen (Extraktstoffen) enthalten, die bei der Bestimmung des Wassergehaltes einer allgemeinen Analysenprobe durch Ofentrocknung verdampfen können.

Combustibles solides de récupération - Détermination de l'humidité par la méthode de séchage à l'étuve - Partie 3: Humidité de l'échantillon pour analyse générale (ISO 21660-3:2021)

Le présent document spécifie une méthode de détermination de l'humidité d'un échantillon pour analyse générale en le séchant dans une étuve. Cette méthode convient à une utilisation pour des échantillons d'analyse généraux conformément à la norme CEN/TS 15414-1[3][1]. Elle s'applique à tous les combustibles solides de récupération.
Si les combustibles solides de récupération contiennent de grandes quantités de fractions d'huile, la méthode Karl-Fischer (par exemple ISO 760) est recommandée. Sinon, une température plus faible est recommandée (par exemple 50 °C ± 10 °C), ainsi qu'une durée de séchage plus importante jusqu'à l'obtention d'une masse constante.
NOTE       Le terme «teneur en humidité», lorsqu'il est utilisé avec «matériaux de récupération», peut induire en erreur puisque des matériaux solides de récupération, par exemple de la biomasse, contiennent fréquemment diverses quantités de composés volatils (extractibles) qui peuvent s'évaporer lors de la détermination de la teneur en humidité de l'échantillon pour analyses générales par séchage en étuve.
[1] L'adoption de la série de normes EN 15414 en tant que série de normes ISO 21660 est prévue. L'ISO 21660‑3 est publié en parallèle au niveau CEN en tant qu`EN 21660-3.

Trdna alternativna goriva - Določevanje vlage z metodo sušenja v sušilni komori - 3. del: Vlaga v preskusnem vzorcu (ISO 21660-3:2021)

General Information

• Status: Published
• Public Enquiry End Date: 30-Mar-2020
• Publication Date: 28-Apr-2021
• ICS: 75.160.10 - Solid fuels
• Technical Committee: AGO - Refuse derived fuel
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 31-Mar-2021
• Due Date: 05-Jun-2021
• Completion Date: 29-Apr-2021
• Ref Project: EN ISO 21660-3:2021 - Solid recovered fuels - Determination of moisture content using the oven dry method - Part 3: Moisture in general analysis sample (ISO 21660-3:2021)

Relations

• Replaces: SIST EN 15414-3:2011 - Solid recovered fuels - Determination of moisture content using the oven dry method - Part 3: Moisture in general analysis sample
• Effective Date: 01-Jun-2021

Overview

EN ISO 21660-3:2021 (also published as ISO 21660-3:2021 and adopted by CEN) specifies the oven dry method for determining moisture content in a general analysis sample of solid recovered fuels (SRF). The standard applies to all SRF and is designed for analysis samples prepared in accordance with ISO 21646. It describes required apparatus, sample preparation, the drying procedure, calculation of moisture as mass loss, precision expectations and reporting rules.

Key topics and technical requirements

• Scope & principle
  • Moisture is determined by drying the general analysis sample and calculating mass loss.
  • Default drying temperature: 105 °C (air or nitrogen atmosphere). Use nitrogen when material is oxidation-sensitive.
• Apparatus & sample
  • Oven controllable at (105 ± 2) °C with 3–5 air changes per hour.
  • Weighing dish materials: glass or corrosion/temperature resistant; sample layer ≤ 0.2 g/cm².
  • Balance resolution: 0.1 mg.
• Sample preparation
  • Use general analysis sample with particle size ≤ 1 mm (per ISO 21646). Mix thoroughly before testing.
• Procedure
  • Minimum of two determinations per test sample.
  • Use at least 1 g of sample per determination.
  • Dry until constant mass: change ≤ 1 mg over a further 60 min at set temperature.
  • Rapid cooling in a desiccator and quick weighing (hygroscopic samples).
  • Warning: risk of self‑ignition for some SRF components when drying at 105 °C.
• Calculations & reporting
  • Moisture (%) = mass loss / initial sample mass × 100.
  • Individual results to two decimal places; report mean rounded to 0.1 %.
• Method validation
  • Automated gravimetric analysers allowed if validated against the reference method and meeting method constraints.
• Special cases
  • If SRF contain large oil fractions, Karl‑Fischer titration (e.g., ISO 760) is recommended.
  • Alternatively, lower drying temperatures (e.g., 50 °C ± 10 °C) with longer drying times may be used for materials with volatile extractives.

Applications and users

• Routine moisture testing in waste‑to‑energy plants, SRF producers, environmental and commercial testing laboratories.
• Quality control for fuel specification, calorific value corrections, and regulatory compliance.
• Useful for labs performing general analysis of SRF where moisture significantly affects energy content and handling.

Related standards

• ISO 21646 - Solid recovered fuels: Sample preparation
• ISO 21637 - Solid recovered fuels: Vocabulary
• ISO 760 - Karl‑Fischer titration (moisture in oil-containing samples)
• EN 15414‑3 (superseded by EN ISO 21660‑3:2021)

Keywords: EN ISO 21660-3:2021, ISO 21660-3, solid recovered fuels, moisture content, oven dry method, general analysis sample, Karl‑Fischer, SRF testing.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2021
Nadomešča:
SIST EN 15414-3:2011
Trdna alternativna goriva - Določevanje vlage z metodo sušenja v sušilni komori -
3. del: Vlaga v preskusnem vzorcu (ISO 21660-3:2021)
Solid recovered fuels - Determination of moisture content using the oven dry method -
Part 3: Moisture in general analysis sample (ISO 21660-3:2021)
Feste Sekundärbrennstoffe - Bestimmung des Wassergehaltes unter Verwendung des
Verfahrens der Ofentrocknung - Teil 3: Wassergehalt in gewöhnlichen Analysenproben
(ISO 21660-3:2021)
Combustibles solides de récupération - Détermination de l'humidité par la méthode de
séchage à l'étuve - Partie 3: Humidité de l'échantillon pour analyse générale (ISO 21660-
3:2021)
Ta slovenski standard je istoveten z: EN ISO 21660-3:2021
ICS:
75.160.10 Trda goriva Solid fuels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 21660-3
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2021
EUROPÄISCHE NORM
ICS 75.160.10 Supersedes EN 15414-3:2011
English Version
Solid recovered fuels - Determination of moisture content
using the oven dry method - Part 3: Moisture in general
analysis sample (ISO 21660-3:2021)
Combustibles solides de récupération - Détermination Feste Sekundärbrennstoffe - Bestimmung des
de l'humidité par la méthode de séchage à l'étuve - Wassergehaltes unter Verwendung des Verfahrens der
Partie 3: Humidité de l'échantillon pour analyse Ofentrocknung - Teil 3: Wassergehalt in gewöhnlichen
générale (ISO 21660-3:2021) Analysenproben (ISO 21660-3:2021)
This European Standard was approved by CEN on 6 March 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 21660-3:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 21660-3:2021) has been prepared by Technical Committee ISO/TC 300 "Solid
recovered materials, including solid recovered fuels" in collaboration with Technical Committee
CEN/TC 343 “Solid Recovered Fuels” the secretariat of which is held by SFS.
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 15414-3:2011.
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 21660-3:2021 has been approved by CEN as EN ISO 21660-3:2021 without any
modification.
INTERNATIONAL ISO
STANDARD 21660-3
First edition
2021-03
Solid recovered fuels — Determination
of moisture content using the oven dry
method —
Part 3:
Moisture in general analysis sample
Combustibles solides de récupération — Détermination de l'humidité
par la méthode de séchage à l'étuve —
Partie 3: Humidité de l'échantillon pour analyse générale
Reference number
ISO 21660-3:2021(E)
©
ISO 2021
ISO 21660-3:2021(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.
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Phone: [phone]
Email: [e-mail]
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Published in Switzerland
ii © ISO 2021 – All rights reserved

ISO 21660-3:2021(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
6 Sample preparation . 2
7 Procedure. 2
8 Calculation . 3
9 Precision . 3
9.1 Repeatability . 3
9.2 Reproducibility . 3
10 Test report . 3
Annex A (informative) Interlaboratory test results . 5
Annex B (informative) Environmental aspects . 8
Bibliography .10
ISO 21660-3:2021(E)
Foreword
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This document was prepared by Technical Committee ISO/TC 300, Solid recovered fuels, in collaboration
with the European Committee for Standardization (CEN) Technical Committee CEN/TC 343, 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 © ISO 2021 – All rights reserved

INTERNATIONAL STANDARD ISO 21660-3:2021(E)
Solid recovered fuels — Determination of moisture content
using the oven dry method —
Part 3:
Moisture in general analysis sample
1 Scope
This document specifies a method for the determination of moisture in a general analysis sample by
drying the sample in an oven. This method is suitable for use for general analysis samples in accordance
[3]1)
with CEN/TS 15414-1 . It is applicable to all solid recovered fuels.
If solid recovered fuels contain large amounts of oil-fractions the Karl-Fischer-Method (for example
ISO 760) is advisable. Otherwise, a lower temperature is recommended (e.g. 50 °C ± 10 °C) and a longer
drying time until constant mass is achieved.
NOTE The term moisture content, when used with recovered materials, can be misleading since solid
recovered materials, e. g. biomass, frequently contain varying amounts of volatile compounds (extractives)
which can evaporate when determining the moisture content of the general analyses sample by oven dr
...