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A2 Ball Clay

PR#3 A2, Saskatchewan ball clay

OxideAnalysisFormula
CaO0.25%0.024
MgO0.43%0.057
K2O0.69%0.039
Na2O0.04%0.003
P2O50.03%0.001
TiO20.72%0.048
Al2O318.99%1.000
SiO265.12%5.820
Fe2O31.84%0.062
MnO0.01%0.001
LOI10.58
Oxide Weight473.31
Formula Weight529.32
If this formula is not unified correctly please contact us.

A2 is a ball clay mined in a quarry about 5 km west of Ravenscrag, Sask. It has a very high plasticity and is suitable as an additive to all types of stoneware and earthenware bodies. This material is used in many bodies made by Plainsman Clays.

A2 has some intrinsic iron content which makes it burn cream-white. It also has some physical iron concretion particles which act as a source of specks and iron blossoms in reduction fired clay bodies employing it.

A2 has natural soluble salts that migrate to the surface during drying and leave a brown coloration on the buff-colored fired surface. However with 0.35% barium to solubles are removed. These soluble salts cause gelling during the deflocculation process and thus prevent A2 from being used in slip bodies.

Analysis updated July 97.

388 Ba ppm
34 Sr pmm
23 Y ppm
10 Sc ppm
413 Zr ppm
1 Be ppm
70 V ppm


Ravenscrag Saskatchewan clays fired at cone 10R (top) and at cone 10R with glaze (bottom): A1, A2, A3, 3B, 3C, 3D. The bottom row has also shows solubles salts (SOLU test).

Plainsman A2 Ball Clay fired test bars

Plainsman A2 Ball Clay fired test bars

Cone 10 reduction (top), cone 11 down to 8 oxidation below that.

IXL Industries clay quarry near Ravenscrag, Saskatchewan in 1984.

IXL Industries clay quarry near Ravenscrag, Saskatchewan in 1984.

Layers of the Whitemud Formation are being mined. The layer being extracted is a silty stoneware (equivalent to Plainsman 3D). Above that is a ball clay (Plainsman A2). Above that is a light burning stoneware (Plainsman A3 and B). A foot-thick layer of hard volcanic ash is visible in the green over burden at the top.

Out Bound Links

In Bound Links


By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="A2 Ball Clay" descrip="PR#3 A2, Saskatchewan ball clay" searchkey="" loi="0.00" casnumber="70694-09-6"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.250" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.430" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="0.690" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="0.040" tolerance=""/> <oxide symbol="P2O5" name="Phosphorus Pentoxide" status="" percent="0.030" tolerance=""/> <oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="0.720" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="18.990" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="65.120" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="1.840" tolerance=""/> <oxide symbol="MnO" name="Manganous Oxide" status="" percent="0.010" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="10.580" tolerance=""/> </volatiles> </material>


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