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No. 1 Glaze Ball Clay

Kentucky Ball Clay, Glaze #1, Glaze Number 1, Glaze No 1

Alternate Names: Glaze #1, #1 Glaze Clay

Oxide Weight311.55
Formula Weight345.78
If this formula is not unified correctly please contact us.

This is a high alumina, low iron ball clay (typical ball clays are 25% or lower alumina). As its name suggests, it works well as a suspender and hardener in glazes, especially for white and transparents where the cleanest possible materials are needed. The Old Hickory No. 5 ball clay is a similar material. Use less than 20% (in glazes having no other clay materials) or problems with gelling could occur.

Crude Color: White
Dry M.O.R. (psi 50% clay/50% flint, cast bars): 400
Wet Sieve Residue, +200 mesh (%): 0.20
Water of Plasticity (%): 32
Linear Dry Shrinkage (%): 6.2
Solubles Sulfates (ppm): 183
Filtration (ml): 26
Specific Surface Area (sq meters per gram): 18.0
CEC/MBI (meq/100 ml): 9.5
pH: 5.7
PCE: 32

Firing Shrinkage (%) Cone 04: 4.1 Cone 3: 5.5 Cone 11: 6.8
Absorption (%) 15.9 12.0 5.4

Particle Size (% finer than):
50 microns: 100
20: 98
10: 95
5: 82
1: 55
0.5: 44

The ball clay you use to suspend your glaze is important!

The ball clay you use to suspend your glaze is important!

I poured 4 teaspoons of two glazes onto a board and let them sit for a minute, then inclined the board. The one with Gleason Ball clay (right, much higher in coal and finer particle size) has settled and the water on the top of running off. The one with Old Hickory #5 ball clay has not settled at all and the whole thing is running downward. Below I have begun to sponge them off. Old Hickory No. 1 Glaze Clay is even better than #5 for suspension. The most amazing thing about this: There is only 7% ball clay in the recipe.

Out Bound Links

By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="No. 1 Glaze Ball Clay" descrip="Kentucky Ball Clay, Glaze #1, Glaze Number 1, Glaze No 1" searchkey="Glaze #1, #1 Glaze Clay" loi="0.00" casnumber="70694-09-6"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.100" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.300" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="0.300" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="0.100" tolerance=""/> <oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="2.400" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="29.400" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="56.300" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.900" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="9.900" tolerance=""/> </volatiles> </material>

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