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McNamee Kaolin

Oxide Analysis Formula
CaO 0.06% 0.00
K2O 0.30% 0.01
MgO 0.05% 0.00
Na2O 0.05% 0.00
TiO2 1.20% 0.04
Al2O3 39.30% 1.00
SiO2 44.50% 1.92
Fe2O3 0.33% 0.01
Oxide Weight 222.66
Formula Weight 258.91


A plastic kaolin from South Carolina (Bath Township, Aiken County) by the Dixie Clay company (owned by R. T. Vanderbilt). It is open-pit-mined, dry-milled, air-classified and sold under different trade names (depending on the particle size). McNamee kaolin is the largest of the sizes and they refer to it as the "softest" (th e powder is fluffy). It has similar properties to Pioneer Kaolin. The leather hard material feels soapy on cut edges.

It is mainly targeted at the rubber industry, but in ceramics its is often used for white stoneware bodies. Noted for peach blush that occurs when fired in gas kilns. It is also suitable in porcelain bodies.

Related Information

McNamee kaolin (left) vs. Pioneer Kaolin (right) at cone 6

Both of these are a kaolin:nepheline syenite blend (mixed 70:30, that produces a zero-porosity body around cone 9 for an American kaolin). Both of these have about 2.5% porosity at cone 6, they respond similarly to the glaze and the fired color is very similar. The McNamee clay has a 1% higher fired shrinkage (10.5% vs. 9.5%) and it requires a little more water to get the same plasticity.


Materials PAR Kaolin
Materials Pioneer Kaolin
Materials Kaolin
Materials Peerless 3 Kaolin
Materials Bilt-Cote Kaolin
Materials Langford Kaolin
Materials Peerless 2 Kaolin
Materials Dixie Clay
Typecodes Kaolin
Pure clay mineral, there are many brand names of varying purity and iron content.


GE Brightness75
% Passing 325 Mesh Wet99.65%
Moisture Content - Powder1% Max
pH for dry powder4.8

By Tony Hansen

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