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CERAMIC CLAYS

Clays offered by our company are light gray to dark gray, sometimes other plastic kaolin clays, low in sandy impurities and organic matter. The mineralogical composition is dominated by kaolinite with varying degrees of structure, then illite, halloyzit and rare montmorillonite. There are currently being extracted two grades labeled : ZI - clay with the Al2O3 content higher than 30%, especially for refractory industry and KI - ceramic clay

Signed clays are usable for :

Ceramics production - ceramic tiles, floor tiles, stoneware products
Production of refractory materials
Brick industries

Delivery conditions

Clay is delivered in natural, bulk condition : EXW Stara Halic. Humidity: max. 25%

Ceramic and technological parameters

Chemical composition

Composition Trade mark
ZI KI
Solution water [ % ] max. 41 max. 44
Green Shrinkage [ % ] max. 8 max. 10
Fired Shrinkage /at 1250`C / [ % ] max. 6 max. 8
Loss on ignition /1250`C / [ % ] max. 12 max. 13
Water absorption /after firing at 1250`C / [ % ] max. 8 max. 3
Green Strength [MPa] max. 1 max. 1
Fired Strength /1250`C / [MPa] max. 10 max. 13
Thermal resistance [`C ] max. 1580 max. -

Chemical result

Element Trade mark
ZI KI
SiO2 % [ % ] aprox. 55,0 aprox. 55,0
Al2O3 % min. 29 max. 27
Fe2O3 % max. 3,5 max. 4
TiO2 % 1.5 1.7
Na2O % 0.2 0.2
K2O % 1.1 1.5
CaO % 0.8 0.5
MgO % 1 1
Loss on calcination max. 12,5 max. 13

Green colour : grey

Fired colour : ivory white, light beige