|Monthly Tech-Tip |
Description: WHITE FINE SODIUM BENTONITE
A finely ground, white, sodium bentonite, supplied as a free flowing white powder. Used as a suspending agent in glazes when white color is important.
Specific Gravity: 2.5
pH (5% dispersion): 9.0-10.0
C.E.C. (meq/100g): 100
Dry Brightness (Green Filter): 85
% Moisture Content: 10% Max.
Brookfield Viscosity (60 rpm @ 5% solids): 146cps
Bentonite can make a clay body instantly plastic, only 2-3% can have a big effect. It also suspends slurries so they don't settle out and slows down drying.
Clays that are not kaolins, ball clays or bentonites. For example, stoneware clays are mixtures of all of the above plus quartz, feldspar, mica and other minerals. There are also many clays that have high plasticity like bentonite but are much different mineralogically.
|By Tony Hansen|
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