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Standard Type : Main
Document No : ISO 501:2025
Document Year : 2025
Pages : 7
Edition : 5
Section Volume : Methods of analysis (ISO/TC 27/SC 5.)
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).