ISO 10329-2025 PDF

Full title and description

ISO 10329:2025 — Hard coal — Determination of plastic properties — Constant-torque Gieseler plastometer method. This International Standard specifies a laboratory method for obtaining a relative measure of the plastic behaviour (fluidity and related properties) of hard coal when heated under prescribed conditions, suitable for use on coals and coal blends used in carbonization and similar processes.

Abstract

ISO 10329:2025 provides a standardized, empirical test procedure using a constant-torque Gieseler plastometer to determine the plastic properties of hard coal. Results are used as a relative indication of coal plasticity and fluidity for carbonization and other industrial evaluations; the standard includes requirements for equipment calibration and test conditions to ensure comparative results.

General information

• Status: Published / Valid.
• Publication date: 16 May 2025 (May 2025).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 73.040 (Coals).
• Edition / version: 3rd edition (Edition 3, 2025).
• Number of pages: 13 pages (pdf).

Scope

This document specifies a method for obtaining a relative measure of the plastic behaviour of hard coal when heated under prescribed conditions. It is intended for coals and blends used in carbonization and in other situations where determination of plastic behaviour is important. The standard is empirical in nature and places emphasis on correct equipment calibration to ensure meaningful, comparative fluidity readings.

Key topics and requirements

• Test method using a constant-torque Gieseler plastometer to measure coal plasticity and maximum fluidity.
• Requirements for sample preparation, test atmosphere, heating rate, and test geometry to ensure repeatability.
• Calibration and verification procedures for the plastometer and torque control (to obtain comparable empirical readings).
• Procedures for reporting results, including units, test conditions, and any deviations from the normative method.
• Notes on interpretation and limitations of empirical fluidity values for use in industrial decision-making.

Typical use and users

Laboratories and quality-control units in coal mines, coke plants, carbonization research facilities, analytical testing laboratories, and companies purchasing or blending coking coals. Also used by standards bodies and technical committees involved in coal analysis and by accreditation bodies evaluating laboratory competence for this test method.

Related standards

Normative references and related sampling/analysis standards often cited with ISO 10329 include parts of the ISO 13909 series (sampling of coal and coke) and other ISO/TC 27 analytical standards relevant to coal and coke testing; national/adopted versions (for example BS ISO 10329:2025) are also available.

Keywords

hard coal; coal plasticity; Gieseler plastometer; constant-torque; fluidity; coking coal; carbonization; coal testing; laboratory method; ISO 10329.

FAQ

Q: What is this standard?

A: ISO 10329:2025 is the third edition of the international test method that specifies how to determine the plastic properties of hard coal using a constant-torque Gieseler plastometer.

Q: What does it cover?

A: It covers the empirical test procedure, sample preparation, equipment calibration and test conditions required to obtain relative measurements of coal plasticity and fluidity for coals and mixes used in carbonization and related processes.

Q: Who typically uses it?

A: Analytical laboratories, coal and coke producers, carbonization plants, research organizations, quality-control personnel, and standards committees involved in coal testing and procurement.

Q: Is it current or superseded?

A: Current — ISO 10329:2025 was published in May 2025 and replaces the earlier (withdrawn) ISO 10329:2017 edition.

Q: Is it part of a series?

A: It is maintained by ISO/TC 27 (Solid mineral fuels) — specifically SC 5 (Methods of analysis) and relates to other ISO standards for coal sampling and testing (for example the ISO 13909 series).

Q: What are the key keywords?

A: Hard coal, plasticity, Gieseler plastometer, constant-torque, fluidity, coking coal, carbonization, coal analysis.