Phonolite is volcanic effusion rock of a stable chemical analysis corresponding to non-phelinic syenite with phoids. It belongs to the group of phonolites. It is used as a fluxing agent in ceramic masses and glass batches where the contents colouring oxides is not decisive. Due to high contents of alkalis phonolite offers the possibility of cutting down the melting temperatures and reducing the firing time.
Piece or ground, sorted into fractions 0-1,25 mm, 0-2 mm, 0-3 mm and 0 -4 mm. Delivery of another grain size can be arranged directly with the staff of the mill. Piece goods can be transported bulk in ČD (Czech Railways) wagons or trucks. Fine fractions are delivered in big-bags or truck-cisterns.
|Bulk weight (kg/m3)||1 250 - 1 350|
|Start of shrinking (°C)||850|
|Start/end of sintering (°C)||1 080 - 1 180|
|Start of melting (°C)||1 320|
|Start of dispersing (°C)||1 380|
|Fe2O3 (%)||max. 2,1|
|CaO (%)||max. 1,3|
|Na2O (%)||8,5 - 11|
|K2O (%)||3,5 - 6,5|
|SiO2 (%)||54 - 58|
|MgO (%)||max. 0,2|