ISO 20360:2020

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 20360
ISO/TC 27/SC 5
Brown coals and lignites —
Secretariat: SA
Determination of the volatile matter
Voting begins on:
2020­04­08 in the analysis sample: one furnace
method
Voting terminates on:
2020­06­03
Charbons bruns et lignites — Détermination des matières volatiles
dans l'échantillon pour analyse: méthode avec utilisation d'un four
RECIPIENTS OF THIS DRAFT ARE INVITED TO
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OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 20360:2020(E)
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. ISO 2020

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ISO/FDIS 20360:2020(E)

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© ISO 2020
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ISO/FDIS 20360:2020(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagent and materials . 2
6 Apparatus . 2
7 Preparation of test sample . 8
7.1 Preparation of the general analysis test sample . 8
7.2 Preparation of the sample pellets . 8
8 Procedure. 8
8.1 Furnace temperature check . 8
8.2 Crucible and lid process . 9
8.3 Volatile matter determination . 9
9 Expression of results . 9
10 Precision .10
10.1 Repeatability limit .10
10.2 Reproducibility limit .10
11 Test report .10
Bibliography .11
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ISO/FDIS 20360:2020(E)

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
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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 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
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iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 27, Solid mineral fuels, Subcommittee
SC 5, Methods of analysis.
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.
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ISO/FDIS 20360:2020(E)

Introduction
The volatile matter is determined as the loss in mass, corrected for moisture, when an analysis sample
of brown coals or lignites is heated out of contact with air under specified conditions. Due to the nature
of brown coals and lignites, the sample being pressed and cut into small pellets is necessary to minimize
the possibility of ejection of sample from the test crucible when the sample is heated at 900 °C, which
has been demonstrated for its good precision and accuracy, and applied in GB/T 212 for many years.
Results obtained by this method agree with measurements of volatile matter content by ISO 5071-1.
The test of volatile matter is empirical and, in order to obtain reproducible results, it is essential that the
rate of heating, the final temperature and the overall duration of the test are carefully controlled. It is
also essential to exclude air from the coal during heating to prevent oxidation. The fit of the crucible lid
is, therefore, critical. The moisture content of the sample is determined at the same time as the volatile
matter so that the appropriate correction can be made.
To arrive at a valid comparison of volatile matter results conducted in different laboratories, it is
essential that the moisture condition of the test samples in the two laboratories is within the expected
variance of the moisture test. If a sample is re-equilibrated with the laboratory atmosphere or partially
dried in one laboratory and not the other then oxidation can and will most definitely occur for brown
coals and lignites. Oxidation will alter the, as-determined, volatile matter of a test sample.
The dry basis precision for volatile matter includes a variance contribution from the moisture
determination and potentially a covariance component, both of which can influence the precision
statistics for volatile matter on a dry basis.
Mineral matter associated with the sample may also lose mass under the conditions of the test, the
magnitude of the loss being dependent on both the nature and the quantity of the minerals present.
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 20360:2020(E)
Brown coals and lignites — Determination of the volatile
matter in the analysis sample: one furnace method
1 Scope
This document specifies a method of determining the volatile matter of brown coals and lignites by the
one furnace method.
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 1170, Coal and coke — Calculation of analyses to different bases
ISO 1213­2, Solid mineral fuels — Vocabulary — Part 2: Terms relating to sampling, testing and analysis
ISO 5068­2, Brown coals and lignites — Determination of moisture content — Part 2: Indirect gravimetric
method for moisture in the analysis sample
ISO 13909­4, Hard coal and coke — Mechanical sampling — Part 4: Coal — Preparation of test samples
ISO 18283, Hard coal and coke — Manual sampling
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1213­2 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
total volatile matter
w
V,T
fractional loss in mass, without correction for moisture, when a solid mineral fuel is heated out of
contact with air under specified conditions
3.2
volatile matter
loss in mass, corrected for moisture, when a solid mineral fuel is heated out of contact with air under
specified conditions
[SOURCE: ISO 1213­2:2016, 3.239]
4 Principle
A portion of the general analysis sample which is pressed and cut into pellets with the side length
of about 3 mm is heated out of contact with air at 900 °C for 7 min. The percentage mass fraction of
volatile matter is calculated from the loss in mass of the test portion after deducting the loss in mass
due to moisture.
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ISO/FDIS 20360:2020(E)

5 Reagent and materials
5.1 Desiccant, fresh or freshly regenerated and preferably self-indicating. Suitable desiccants are
magnesium perchlorate and silica gel.
WARNING — Magnesium perchlorate is a strong oxidizing agent. Do not attempt to regenerate
the absorbent. Do not permit contact with organic materia
...