NF EN ISO 21068-1:2024

This document gives definitions and specifies techniques for the preparation of samples for the chemical analysis of silicon-carbide-containing raw materials and refractory products including: a)SiC raw materials; b)graphite brick containing silicon carbide; c)silicon carbide brick (includes the bricks containing silicon nitride, silicon oxynitride, sialon); d)refractories containing carbon and/or silicon carbide mixed with clay; e)refractories containing carbon and/or silicon carbide mixed with silica (and fused silica); f)refractories containing carbon and/or silicon carbide mixed with high alumina material; g)refractories containing carbon and/or silicon carbide mixed with magnesia (and dolomite); h)refractories containing carbon and/or silicon carbide mixed with chrome mineral or magnesia-chrome materials; i)refractories containing carbon and/or silicon carbide except those described in a) to h) above.