|Monthly Tech-Tip |
Description: SODIUM BENTONITE GRANULES
Sodium bentonite granules, agglomerated from 325 mesh bentonite. It is fast dispersing and is used as a suspending agent in glazes and a binder for pencil lead.
Specific Gravity: 2.5
pH (5% dispersion): 8.5-10.5
C.E.C. (meq/100g): 82
Dry Brightness (Green Filter): 65
% Moisture Content: 12% Max.
Brookfield Viscosity (60 rpm @ 5% solids): 532cps
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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