This article contributes to a better understanding how sample preparation influences technological parameters. Over the last tenyears' research in the field of rheology, setting and curing behaviour and strength evolution clearly shows that the obtainable results are strongly dependent on the sample preparation conditions. Firstly, the flow properties of refractory castable are not only affected by the water addition but also by the mixing conditions. Imprecise adjustments of the power input significantly change the flow properties and in consequence thedensification of the material. On the one hand for material development in the laboratory this requires mixing devices where the mixing energy input can be monitored and adjusted precisely at least for the set of samples prepared for a single material development. On the other hand, mixing conditions on site should be checked carefully because it is common knowledge that the mixing devices available in the user's industry often do not cover the requirements for a proper mixing of highly dispersed refractory castables therefore castables will behave different.
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