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Many ceramic products are made by extruding materials which are not extrudable in their origi nal state and must be made so by appropriate treatment and by incorporating various additives which adjust their rheology or flow properties. The properties that are of importance for extru sion can, in fact, be characterised and quantified by means of rheological measurements. Capillary rheometry especially enables many dif ferent extrudability tests to be carried out, rang ing from simple suitabilitydoi:10.2478/arh-1993-030109 fatcat:6bxt5yqqzvayjbfb4zryzta3b4