•The secret to cool bodies and glazes is a lot of testing.
•The secret to know what to test is material and chemistry knowledge.
•The secret to learning from testing is documentation.
•The place to test, do the chemistry and document is an account at https://insight-live.com
•The place to get the knowledge is https://digitalfire.com

Sign-up at https://insight-live.com today.

McNamee Kaolin

South Carolina Kaolin

Oxide Weight222.66
Formula Weight258.91
If this formula is not unified correctly please contact us.
GEBR - GE Brightness 75
P325 - % Passing 325 Mesh Wet 99.65%
MOIP - Moisture Content - Powder 1% Max
pHPW - pH for dry powder 4.8

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.

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

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.

Out Bound Links

In Bound Links

By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="McNamee Kaolin" descrip="South Carolina Kaolin" searchkey="" loi="0.00" casnumber="95077-05-7"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.060" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.050" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="0.300" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="0.050" tolerance=""/> <oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="1.200" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="39.300" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="44.500" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.330" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="14.000" tolerance=""/> </volatiles> </material>

Feedback, Suggestions

Your email address


Your Name


Copyright 2003, 2008, 2015 https://digitalfire.com, All Rights Reserved