Pfefferkorn method

While some ceramists swore by measured data obtained with the aid of the Pfefferkorn method, others preferred the capillary rheometric approach, and still others, including H.W. Hennicke at the University of Clausthal-Zellerfeld and researchers at the Brick and Tile Institute in Essen, devised their own techniques. In pertinent U.S. literature, studies based on the Brabender measuring kneader [11] were encountered most frequently. 

The Pfefferkorn method is widely accepted in practice and was originally developed for soft silicate ceramic materials. The Pfefferkorn method is less suitable for stiffer bodies, as usually processed in the advanced ceramics industry, as the low resolution at a small impact deformation height impedes the reproducibility. 

It is a fact that even today no methods exist, which clearly establish and depict the plasticity relevant to extrusion. This holds true particularly for such methods as Pfefferkorn or the penetrometer, which provide a reference figure. It appears that the most apt are those methods that simulate the extrusion process. 

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