White grogged sculpture body made from talc and ball clay (the same recipe as L213 but 20% of the talc has been substituted for 35 mesh grog and silica sand). This body is commonly used to make large pieces.
Talc/Ball clay bodies are very plastic and at the same time dry well. The additional fine silica sand and grog give this body even better drying capabilities. Despite this, F100G feels quite smooth. It can be employed successfully to produce extreme and large sculptural pieces. We recommend F100G when sculptors need high certainty that ware can be dried without cracks while still having a relatively smooth fired surface. One caution: Its dry strength is fairly low, handle dry ware with care.
The high plasticity of F100G slows drying and makes it susceptible to failure in the early water-smoking phase of firing. Make sure pieces are thoroughly dry before firing. Preheat your kiln overnight, or even for a full day, if pieces are large.
F100G can be fired to cone 4 fairly safely. At cone 6 it still appears to be stable visually, however the fired shrinkage and porosity have already reversed (indicating firing volatility even though its porosity is relatively high).
F100G fired to cone 04, 02, 2, 4, 6 (bottom to top). Notice the color changes to yellow at cone 6.
We do not supply a thermal expansion value. The reason is that such numbers often mislead users. First, a body has different thermal expansion characteristics when fired at different temperatures, schedules and atmospheres. Dilatometers are only useful when manufacturers can measure bodies and glazes over time and in the same firing conditions. If a chart is supplied here, please view only as a way to compare one body with another.
Another significant issue is that many customers compare measured thermal expansion numbers with calculated values of glazes in efforts to fits those glazes to a body. This does not work. Calculated values are relative only and have limitations that must be understood. The best way to fit glazes to your clay bodies is by testing, evaluation, adjustment and retesting. For example, if a glaze crazes, adjust its recipe to bring the expansion down (using your account at insight-live), fire a glazed piece and thermal stress it (using an IWCT test, 300F into ice-water). If it still crazes, repeat the process.
If we recommend a base clear or glossy glaze, try calculating the expansion of that as a rough guide to know whether your glazes will fit.
Drying Shrinkage: 4.5-5.5% Dry Strength: n/a Drying Factor: B110 Water Content: 19.5-20.5% Mar 99 Dry Density: 1.95
Sieve Analysis (Tyler mesh):
+48 (300 microns): 0.0-0.6% 48-65 (300-210 microns): 0.4-0.8 65-100 (210-149 microns): 2.5-3.5 100-150 (149-106 microns): 2.0-3.0 150-200 (106-75 microns): 5.5-7.5 200-325 (75-45 microns): 7.0-10.0
Cone 04: 1.0-2.0% Cone 02: 1.5-2.5 Cone 2: 2.0-3.0 Cone 4: 2.5-3.5 Cone 6: 2.0-3.0
Cone 04: 11-14% Cone 02: 10.5-13 Cone 2: 10-12 Cone 4: 10-11.5 Cone 6: 9.5-11
This incredible house was made by Kira Vlietstra, a first-year visual communications student at our local college. It is 18" high, her first attempt, a testimony to how well this clay works for hand building.
F100G dragon by Mary Stankevicius
F100G Boars by Mary Stankevicius
Safety Data SheetClick here for web view.
|Plainsman Clays Ltd.|
702 Wood Street, Medicine Hat, Alberta T1A 1E9
Phone: 403-527-8535 FAX:403-527-7508