OM #4 Ball Clay
Tennessee Ball Clay
| PCE - Pyrometric Cone Equivalent |
32 |
| DSHR - Drying Shrinkage |
7.0-7.5% |
Old Mine #4, Mayfield, KY.
A fine-grained ball clay with excellent plasticity and strength. Old Mine #4 is an "industry standard" based on its popularity in both casting and plastic formed bodies. It is also widely used as a suspension aid in glazes.
OM#4 ball clay is variable in nature and tends to be more vitreous than some of the more refractory ball clays that are available. It has some soluble salts which can give a brown coloration to the surface, so barium carbonate may be needed to precipitate these.
Physical Properties
===================
Water of Plasticity*: 37.0%
% Dry Shrinkage*: 6.5
Dry M.O.R., psi:* 825
pH: 4.4
C.E.C., meq/100g: 11.0
Specific Surface Area, sq metre/g: 24.4
Soluble sulfur+: Low
P.C.E.: 32
Particle Size, Microns: 20 10 5 2 1 0.5 0.2
(% finer than) 99% 97% 93% 81% 72% 56% 35%
Fired Properties
================
Cone 5 10
----
Total Shrinkage: 13.0% 14.5%
Absorption: 10.0% 1.0%
Shipped from Mayfield, KY
------------------
*Extruded, 50% ball clay, 50% flint
+Low-trace to 150, Med-150-400, High-450+
**50% Clay, 50% Nepheline Syenite
Out Bound Links
In Bound Links
Pictures
OM#4 ball clay test bars fired from cone 4-10 oxidation and cone 10 reduction. The yellow on bar 12 is iron stained soluble salts.
XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="OM #4 Ball Clay" descrip="Tennessee Ball Clay" searchkey="OM4 Ball Clay, OM4, OM#4, OM 4, Old Mine #4, OM-4 Ball Clay" loi="0.00" casnumber="70694-09-6">
<oxides>
<oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.300" tolerance=""/>
<oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.400" tolerance=""/>
<oxide symbol="K2O" name="Potassium Oxide" status="" percent="1.000" tolerance=""/>
<oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="0.300" tolerance=""/>
<oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="1.200" tolerance=""/>
<oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="27.900" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="55.200" tolerance=""/>
<oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="1.100" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="LOI" name="Loss on Ignition" percent="12.600" tolerance=""/>
</volatiles>
</material> | 
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