Alternate Names: Georgia Kaolin
There have been some rumors during 2012 that this material will be discontinued, however as of June 2012 Imerys was insisting that there are no such plans.
Pioneer clay is used in pressing, casting and extruding bodies. Its fires fairly white and provides moderate to good dry strength. Its chemistry is very close to theoretical kaolin.
Pioneer Kaolin has been a standard for many years in the North American ceramic industry and bodies and glazes.
Typical physical properties as per data sheet TD-49R
Particle size, % < 2 microns 55-65
Mean particle size (microns) 1.0-1.2
325 mesh residue, % max .75
pH, 20% solids 4.0-6.5
Strength (dry M.O.R.), psi
-50:50 clay:flint 300-400
Cone 10 (M.O.R.), psi
-50:50 clay:flint 2500-3000
Cone 10 absorption, % 18-20
Moisture, % max 3.0
Color (fired), Cone 8 100% clay
-brightness, % MgO 85.1
-whiteness index 18.8
P.C.E. Cone 34
C.E.C. (meq./100g) 4.5-5.5
The material is much less dense than most other ceramic materials (that is why these bags are so tall). When moved the powder within becomes unstable and they are prone to falling over.
Cone 10R (top) and cone 11 down to 8 oxidation (downward).
Pure clay mineral, there are many brand names of varying purity and iron content.