McNamee Kaolin

Description: South Carolina Kaolin

Oxide	Analysis	Formula
CaO	0.06%	-
K2O	0.30%	0.01
MgO	0.05%	-
Na2O	0.05%	-
TiO2	1.20%	0.04
Al2O3	39.30%	1.00
SiO2	44.50%	1.92
Fe2O3	0.33%	0.01
LOI	14.00%	n/a
Oxide Weight		222.66
Formula Weight		258.91

Notes

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.

Links

Materials	PAR Kaolin
Materials	Dixie Clay
Materials	Peerless 2 Kaolin
Materials	Langford Kaolin
Materials	Bilt-Cote Kaolin
Materials	Peerless 3 Kaolin
Materials	Kaolin The purest of all clays in nature. Kaolins are used in porcelains and stonewares to impart whiteness, in glazes to supply Al2O3 and to suspend slurries.
Materials	Pioneer Kaolin
Typecodes	Kaolin Pure clay mineral, there are many brand names of varying purity and iron content.

Data

GE Brightness	75
% Passing 325 Mesh Wet	99.65%
Moisture Content - Powder	1% Max
pH for dry powder	4.8

By Tony Hansen
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