FprEN ISO 14720-1

SLOVENSKI STANDARD
oSIST prEN ISO 14720-1:2025
01-april-2025
Preskušanje keramičnih materialov - Določanje žvepla v neoksidativnih
keramičnih surovinah in osnovnih materialih - 1. del: Infrardeče merilne metode
(ISO/DIS 14720-1:2025)
Testing of ceramic materials - Determination of sulfur in non-oxidic ceramic raw materials
and ceramic materials - Part 1: Infrared measurement methods (ISO/DIS 14720-1:2025)
Prüfung keramischer Werkstoffe - Bestimmung des Schwefelgehaltes in nichtoxidischen
keramischen Roh- und Werkstoffen - Teil 1: Infrarotmessverfahren (ISO/DIS 14720-
1:2025)
Analyse des matériaux céramiques - Dosage du soufre dans les produits et les matières
premières céramiques non oxydes - Partie 1: Méthodes d'essai par infrarouge (ISO/DIS
14720-1:2025)
Ta slovenski standard je istoveten z: prEN ISO 14720-1
ICS:
81.060.10 Surovine Raw materials
oSIST prEN ISO 14720-1:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 14720-1:2025
oSIST prEN ISO 14720-1:2025
DRAFT
International
Standard
ISO/DIS 14720-1
ISO/TC 33
Testing of ceramic materials —
Secretariat: BSI
Determination of sulfur in non-
Voting begins on:
oxidic ceramic raw materials and
2025-02-20
ceramic materials —
Voting terminates on:
2025-05-15
Part 1:
Infrared measurement methods
Essai des matières céramiques — Détermination de la teneur
en soufre des matières premières céramiques non oxydes et des
matériaux céramiques non oxydes —
Partie 1: Méthodes d'essai aux infrarouge
ICS: 81.060.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
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This document is circulated as received from the committee secretariat.
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Reference number
ISO/DIS 14720-1:2025(en)
oSIST prEN ISO 14720-1:2025
DRAFT
ISO/DIS 14720-1:2025(en)
International
Standard
ISO/DIS 14720-1
ISO/TC 33
Testing of ceramic materials —
Secretariat: BSI
Determination of sulfur in non-
Voting begins on:
oxidic ceramic raw materials and
ceramic materials —
Voting terminates on:
Part 1:
Infrared measurement methods
Essai des matières céramiques — Détermination de la teneur
en soufre des matières premières céramiques non oxydes et des
matériaux céramiques non oxydes —
Partie 1: Méthodes d'essai aux infrarouge
ICS: 81.060.10
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
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BE CONSIDERED IN THE LIGHT OF THEIR
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Published in Switzerland Reference number
ISO/DIS 14720-1:2025(en)
ii
oSIST prEN ISO 14720-1:2025
ISO/DIS 14720-1:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Principle . 1
3 Apparatus . 1
4 Reagents . 2
5 Sampling and sample preparation . 2
6 Calibration . 2
7 Performance . 2
7.1 Preparation of analysis .2
7.2 Determination of blank value .3
7.3 Determination of sulfur content .3
8 Calculation and report of the results . 3
9 Precision . 3
9.1 Repeatability .3
9.2 Reproducibility .3
10 Test report . 3
Annex A (informative) Results of the round-robin test . 5
Annex B (informative) Information regarding the validation of the uncertainty of the mean
value . 7
Annex C (informative) Commercial Certified Reference Materials (CRM) . 8
Bibliography . 9

iii
oSIST prEN ISO 14720-1:2025
ISO/DIS 14720-1:2025(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 14720-1 was prepared by Technical Committee ISO/TC 33, Refractories.
ISO 14720 consists of the following parts, under the general title Testing of ceramic materials — Determination
of sulfur in non-oxidic ceramic raw materials and ceramic materials:
— Part 1: Infrared measurement methods
— Part 2: Inductively coupled plasma optical emission spectrometry (ICP-OES) or ion chromatography (IC)
after burning in the oxygen flow

iv
oSIST prEN ISO 14720-1:2025
DRAFT International Standard ISO/DIS 14720-1:2025(en)
Testing of ceramic materials — Determination of sulfur in
non-oxidic ceramic raw materials and ceramic materials —
Part 1:
Infrared measurement methods
1 Scope
This part of ISO 14720 defines a method for the determination of sulfur in non-oxidic ceramic raw materials
and ceramic materials, such as silicon carbides, silicon nitrides, graphites, carbon blacks, cokes, carbon
powders. If proved by the recovery rate, this method can also be applied for other non-metallic powdered
and granular materials, for example silicon dioxide.
This part of ISO 14720 is applicable for materials with mass fractions of sulfur from 0,005 % to 2 %.
This part of ISO 14720 can also be applied for materials with higher mass fractions of sulfur after verification
of the particular case.
2 Principle
The sample and added combustion accelerators (mostly tungsten- or iron-granules) are heated in an
inductive furnace under oxygen atmosphere. The high-frequency field of the furnace couples with electrically
conductive components of sample and combustion accelerators. The sample is heated to temperatures
above 1 800 °C and the total sulfur content of the sample is released as sulfur dioxide. The reaction gas is
transferred to the infrared absorption cell of the analyser. The molecular absorption of sulfur dioxide is
measured by using a narrow-band optical filter which is translucent for the wavelength of the characteristic
infrared absorption of sulfur dioxide. The mass fraction of sulfur dioxide in the reaction gas is proportional
to peak-height and peak-area, respectively, of the transient absorption signal. The mass fraction of sulfur in
the sample is calculated by using a calibration function established by suitable calibration samples measured
under comparable conditions.
3 Apparatus
3.1 Device with induction furnace or alternatively resistance furnace and infrared cell.
NOTE The correctness of the analysis result can be proved by using matrix-analogous reference materials or by
comparing with an independent alternative test method. If determining mass fractions below 100 mg/kg, it has to be
considered that some analytical de
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