L210
Description
Low temperature, smooth, highly plastic, brown-burning, native terra cotta body. It fires to a stoneware at cone 2.
News
Starting with code beginning "P6984" L210 has a new recipe. The change was to remove the 10% talc that it formerly contained (we are removing talc from many other clay bodies also). You should not see an impact on glaze fit or fired color. The body remains highly plastic and very smooth. It is now also useful as a stoneware, firing stable in the cone 2-4 range.
Process Properties
Because L210 is highly plastic it also has high drying shrinkage. Please exercise caution to dry pieces evenly.
Firing
L210 fires to a light brown at cone 02-06. By cone 2 the color intensifies to a dense stoneware brown. Before cone 4 it is over fired. Like any other low-fire body at cone 06-04, L210 is fairly weak and has high porosity. But at cone 02 it is much stronger.
Glazing
L210 fires to a light enough color that bright colored glazes should work well on it. Transparent glazes can be applied thinly to produce ultra clear results.
Although cannot guarantee that commercial glazes will not craze or shiver we do test multiple types for fit. Regarding toxicity: Do not assume food safety of brightly colored glazes in your kiln without a leach test (e.g. GLLE test). Consider using a transparent or white liner glaze for food surfaces.
Although commercial bottled products are expensive, they are convenient. It is practical to make your own dipping or brushing base glazes that dry faster and fit better (do not craze or shiver). Adding powdered stains is also possible. There is lots of documentation on how to make and mix our G1916Q and G3879 and recipes. Each of them has variations to enable tuning fit any body. It is possible to mix them as a brushing glaze, base coat or dipping glaze.
Spectrum 700 clear, 301 white, 743 red and 753 yellow on L210. Since L210 fires lighter than the traditional terra cotta red, bright-colored glazes work well on it.
Spectrum 301 Majolica on L210 (thinner and thicker). L210 is an excellent clay for this glaze, we have noted no shivering or crazing. And the microsurface is more glassy and smooth than on L215 (plus it shivers on L215).
Physical Properties
Drying Shrinkage: 7.0-8.0% Dry Strength: n/a Water Content: 22.0-23.0% Drying Factor: C130 Dry Density: n/a
Sieve Analysis (Tyler mesh):
+35: tr 35-48: tr 48-65: 0.1% 65-100: 3.5-4.5 100-150: 3.0-4.0 150-200: 4.5-5.5
Fired Shrinkage:
Cone 06: 0.0-1.0% Cone 04: 2.0-3.0 Cone 02: 4.5-5.5 Cone 2: 6.0-7.0
Fired Absorption:
Cone 06: 10-12% Cone 04: 8.0-10.0% Cone 02: 2.5-3.5 Cone 2: 0.5-1.5
