ISO 501
(Main)Hard coal — Determination of the crucible swelling number
Hard coal — Determination of the crucible swelling number
ISO 501:2012 specifies a method for determining the swelling properties of hard coal when heated in a covered crucible. The "crucible swelling number" (CSN) is also known as the "free swelling index" (FSI).
Houille — Détermination de l'indice de gonflement au creuset
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ISO/FDIS 501
ISO/TC 27/SC 5
Hard coal — Determination of the
Secretariat: SA
crucible swelling number
Voting begins on:
Houille — Détermination de l'indice de gonflement au creuset 2025-02-04
Voting terminates on:
2025-04-01
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Reference number
ISO/FDIS 501:2025(en) © ISO 2025
FINAL DRAFT
ISO/FDIS 501:2025(en)
International
Standard
ISO/FDIS 501
ISO/TC 27/SC 5
Hard coal — Determination of the
Secretariat: SA
crucible swelling number
Voting begins on:
Houille — Détermination de l'indice de gonflement au creuset
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
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 501:2025(en) © ISO 2025
ii
ISO/FDIS 501:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Preparation of the test sample. 1
6 Apparatus . 2
7 Preparation of apparatus . 4
8 Procedure . 5
9 Expression of results . 6
10 Precision of the method . 7
10.1 Repeatability .7
10.2 Reproducibility .7
11 Test report . 7
iii
ISO/FDIS 501:2025(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
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 27, Coal and coke, Subcommittee SC 5, Methods
of analysis.
This fifth edition cancels and replaces the fourth edition (ISO 501:2012), which has been technically revised.
The main changes are as follows:
— replaced the word "should" with "shall" throughout the document;
— corrected dimension expressions e.g. 26 ± 1,0 mm to 26 mm ± 1 mm;
— standardised the reporting of ½ as 0,5
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
FINAL DRAFT International Standard ISO/FDIS 501:2025(en)
Hard coal — Determination of the crucible swelling number
WARNING — Use of this document can involve hazardous materials, operations and equipment.
This document does not purport to address all of the safety issues associated with its use. It is the
responsibility of the user of this document to establish appropriate safety and health practices and
determine the applicability of regulatory limitations prior to use.
1 Scope
This document specifies a method for determining the swelling properties of hard coal when heated in a
covered crucible.
NOTE The "crucible swelling number" (CSN) is also known as the "free swelling index" (FSI).
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 13909-4, Coal and coke — Mechanical sampling — Part 4: Coal — Preparation of test samples
ISO 18283, Coal and coke — Manual sampling
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Principle
A sample of coal is heated in a covered crucible under standard conditions of time and temperature. The
shape of the coke button obtained is classified by comparison with the outlines of a set of standard profiles.
5 Preparation of the test sample
The test sample shall be the general analysis test sample prepared in accordance with ISO 13909-4 and
ISO 18283. Ensure that the moisture in the sample is in equilibrium with the
...
ISO TC 27/SC 5
Date: 2024--10-25
ISO/FDIS 501:2024(en)
ISO /TC 27/SC 5/WG10
Secretariat: SA
Date: 2025-01-21
Hard coal — Determination of the crucible swelling number
Houille — Détermination de l'indice de gonflement au creuset
Copyright notice
ThisFDIS stage
ISO/DISFDIS 501:20242025(en)
© ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted under 2025
All rights reserved. Unless otherwise specified, or required in the applicable lawscontext of the user's country, neither
its implementation, no part of this ISO draft nor any extract from itpublication may be reproduced, stored in a retrieval
system or transmitted or utilized otherwise in any form or by any means, electronic, or mechanical, including
photocopying, recording or otherwiseor posting on the internet or an intranet, without prior written permission being
secured.
Requests for permission to reproduce should be addressed to . Permission can be requested from either ISO at the
address below or ISO'sISO’s member body in the country of the requester.
ISO copyright office
Case postale 56 • CP 401 • Ch. de Blandonnet 8
CH-12111214 Vernier, Geneva 20
Tel.Phone: + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail: copyright@iso.org
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
Website: www.iso.org
Published in Switzerland
iii
ISO DIS/FDIS 501: 2024 2025(en)
Contents
Foreword . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Preparation of the test sample . 1
6 Apparatus . 2
7 Preparation of apparatus . 7
8 Procedure . 10
9 Expression of results . 13
10 Precision of the method . 13
10.1 Repeatability . 13
10.2 Reproducibility . 13
11 Test report . 15
iv Error! Reference source not found.
iv
ISO/DISFDIS 501:20242025(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.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 27, Coal and coke, Subcommittee SC 5, Methods
of analysis.
This fifth edition cancels and replaces the fourth edition (ISO 501:2012), which has been technically revised.
The main changes are as follows:
— — replaced the word ‘should’"should" with ‘shall’"shall" throughout the document;
— Correctedcorrected dimension expressions e.g. 26 ± ± 1,0 mm to 26 mm ± ± 1 mm;
— Standardisedstandardised the reporting of ½ as 0,5
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.htmlwww.iso.org/members.html.
v
ISO/DIS 501:2024(en)
DRAFT International Standard
Hard coal — Determination of the crucible swelling number
WARNING — Use of this document can involve hazardous materials, operations and equipment. This
document does not purport to address all of the safety issues associated with its use. It is the
responsibility of the user of this document to establish appropriate safety and health practices and
determine the applicability of regulatory limitations prior to use.
1 Scope
This document specifies a method for determining the swelling properties of hard coal when heated in a
covered crucible.
NOTE The "crucible swelling number" (CSN) is also known as the "free swelling index" (FSI).
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 13909--4, Coal and coke — Mechanical sampling — Part 4: Coal — Preparation of test samples
ISO 18283, Coal and coke — Manual sampling
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obphttps://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/https://www.electropedia.org/
4 Principle
A sample of coal is heated in a covered crucible under standard conditions of time and temperature. The shape
of the coke button obtained is classified by comparison with the outlines of a set of standard profiles.
5 Preparation of the test sample
The test sample shall be the general analysis test sample prepared in accordance with ISO 13909-4 and
ISO 18283. Ensure that the moisture in the sample is in equilibrium with the laboratory atmosphere, exposing
it, if necessary, in a thin layer for the minimum time required to achieve equilibrium.
The sample used for the crucible swelling number (CSN) test shall be ground to pass a 212 μm sieve. A small
swing hammer crusher with rotary hammers is suitable for grinding samples, a mortar and pestle can be used
to grind samples of low mass, e.g. less than 60 g. Avoid very fine grinding, as CSN can be adversely affected
with pulverization level. Avoid the use of ring mills as the heat generated during very fine grinding can
potentially oxidise the sample and adversely affect the CSN result. Once the sample is prepared to this size
specification, the test shall be performed within 24 h in order to avoid oxidation and a potentially misleading
CSN result.
ISO DIS/FDIS 501: 2024
2025(en)
6 Apparatus
6.1 6.1 Crucible and lid (see Figure 1):Figure 1): silica crucible, squat form, and silica lid with ring
handle.
The crucible shall conform to the following specifications:
External height: 26 mm ± 1 mm
External diameter at top: 41 mm ± 1 mm
Internal diameter at base: 14 mm ± 3 mm
Mass: 12 g ± 1 g
Capacity: 16 ml to 17,5 ml
Error! Reference source not found.
ISO/DISFDIS 501:20242025(en)
Dimensions in millimetres
...
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