International Organization for Standardization

Chemical analysis of silicon-carbidecontaining raw materials and refractory products — Part 1: General information and sample preparation - First Edition
 N 21068-1

Annotation

This part of ISO 21068 gives definitions and specifies techniques for the preparation of samples for the chemical analysis of silicon-carbide-containing raw materials and refractory products including:

graphite brick containing silicon carbide;

silicon carbide brick (includes the bricks containing silicon nitride);

refractories containing carbon and/or silicon carbide mixed with clay;

refractories containing carbon and/or silicon carbide mixed with silica (and fused silica);

refractories containing carbon and/or silicon carbide mixed with high alumina material;

refractories containing carbon and/or silicon carbide mixed with magnesia (and dolomite);

refractories containing carbon and/or silicon carbide mixed with chrome mineral or magnesia-chrome materials;

refractories containing carbon and/or silicon carbide except those described in a) to g) above.

The items of chemical analysis described in ISO 21068, Parts 1 to 3 are as follows:

loss on drying (LOD);

loss on ignition (LOI);

total carbon, Ctotal;

free carbon, Cfree;