GROGGED BLACK MANGANESE CLAY BODY

Black firing ceramic body

Plastic body with 18-21% of water content

For hand-working, pressing and extrusion

CHEMICAL ANALYSIS

SiO2 – 45,80%

Al2O3 – 16,40%

Fe2O3 – 5,10%

CaO – 4,90%

MgO – 2,70%

Na2O – 0,20%

K2O – 3,50%

COOKING TEMPERATURE: 980-1040 ºC

WATER ABSORPTION: 12-16%

COOKING CONTRACTION: 0,8-1%

MECHANICAL STRENGTH: 22,1N/mm2

DILATION COEFFICIENT: 60,5×10^-7ºC

COLOR: Brown-black

DRYING CONTRACTION: 5,5-6%

CALCIMETRY: 5%

LOSS OF FIRE: 4,9-5,4%

QUANTITY OF MANGANESE: 20%

QUANTITAT OF FIRECLAY: 18%