Chemical analysis methods for refractory materials containing silicon carbide, silicon nitride, silicon oxynitride and sialon—Part 1: General rules, terminology and specimen preparation (Draft for Comment)

This document is intended for manufacturers, testing bodies and related laboratories dealing with raw materials and refractory products containing silicon carbide, silicon nitride, silicon oxynitride and sialon. It specifies general rules, terminology, specimen preparation, preliminary analysis, expression of results and test report requirements for chemical analysis. Core compliance requirements include unified specimen particle size, grinding methods, drying conditions and contamination correction methods, as well as the use of X-ray diffraction and ammonia-release prescreening methods for preliminary identification of unknown specimens to support accurate subsequent determination of constituents. The document is modified from ISO 21068-1:2024 and is intended to serve as the basic specification for subsequent part-specific test methods.