Application:
OB 206/7 – refractory clay powder for ceramic bodies (architechtural ceramics, refractory etc.). Creates speckles and textures in the reduzing firing.
Al2O3 * 2SiO2 * 2H2O - Molar weight: 258
WAK (x10-6 °C) 4.6
Chem. analysis in %:
SiO2 56.5; TiO2 2.2; Al2O3 36.9; Fe2O3 2; CaO 0.2;
MgO 0.3; K2O 1.8; Na2O 0.1; Loss of ignition 11.3.
Grinding fineness in %:
> 63 µm-mesh plus 0.5; Br.shrinkage 9.8; Wass.Aufn.0.6
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