In this paper are presented testing results during process of fast drying at conditions of increased temperature. Three different masonry raw materials were examined using recircular laboratory dryer with air recirculation. It is concluded that samples containing more clay minerals and having better bind qualities are appropriate for increased temperature fast drying appliance.

Raw materials which do not belong to the mentioned group can not be used in these processes, even in the case of slower drying regime, although their both physical and mechanical (technological) characteristics do not refer to such behavior.