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IXL 45D

Description: Tan to brown burning smooth, plastic low temperature stoneware

Oxide Analysis Formula
CaO 0.37% 0.04
K2O 3.60% 0.23
MgO 0.83% 0.12
Na2O 0.70% 0.07
TiO2 0.66% 0.05
Al2O3 17.10% 1.00
P2O5 0.15% 0.01
SiO2 66.10% 6.56
Fe2O3 2.19% 0.08
MnO 0.01% -
LOI 6.70%n/a
Oxide Weight 547.04
Formula Weight 586.32

Notes

A smooth light tan burning terra cotta. It progresses to brown as it matures above cone 1 (due to a significant percentage of feldspar naturally present in the material). Although mainly used in brick and pipe production, Luke Lindoe discovered that this material, all by itself, produced a wonderful pottery clay, suitable to make stoneware at very low temperatures. It was useful in stoneware bodies to introduce feldspar. 45D was often coupled with 45R, a red burning clay, also smooth. A sand, like 45F, was added when the 45F/45R combination did not have sufficient drying performance.

Related Information

IXL 45D clay

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This was used to make vitrified pipe. These SHAB test fired bars show it from cone 6 (top) down to cone 1. At cone 1 it has 3% porosity but above that it fires to almost porcelain density. This level of fired maturity in a clay that does not fire red is unusual. Alberta Clay products had sealed their sewer pipe using salt glaze for decades because their clays, obtained near Medicine Hat, were refractory and porous, even when fired at high temperatures. IXL discovered this low temperature light burning and plastic terra cotta near Elkwater, Alberta. It fired so vitreous that no glaze was needed!

Links

Typecodes Clay Other
Clays that are not kaolins, ball clays or bentonites. For example, stoneware clays are mixtures of all of the above plus quartz, feldspar, mica and other minerals. There are also many clays that have high plasticity like bentonite but are much different mineralogically.
Materials IXL 45R
By Tony Hansen
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