Exploitable deposits are pegged out by means of core drilling. Strata profiles in a system of coordinates with max. 50 m distance between the drill holes provide information on the quality and quantity of the clay zones. Later sampling at the face serves production control.
Quality testing and assessment are performed continuously during processing of the different products, on the basis of representative samples taken mostly direct from the material flow mainly by means of automatic samplers and sample dividers. The essential parameters of the raw material specification sheets are defined in accordance with DIN regulations, the recommendations of the German Ceramic Society (DKG) and customer-specific agreements.
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Raw clay:
Chemical composition firing behaviour, castability, modulus of rupture, screening refuse. -
Specific gravity of the particles, purity, expansion-shrinkage, chemical analysis
Lump chamotte: -
Milled chamotte:
Particle size distribution, magnetic residue -
Milled clay:
Particle size distribution, firing behaviour, chemical analysis -
Ceramic bodies:
Firing shrinkage, porosity, plasticity and workability or castability, and body formation