Redstone

Alternate Names: Red Stone

Description: Plainsman Native Clay

Oxide	Analysis	Formula
BaO	0.32%	0.02
CaO	0.19%	0.03
K2O	2.57%	0.21
MgO	0.76%	0.14
Na2O	0.05%	0.01
TiO2	0.65%	0.06
Al2O3	13.54%	1.00
P2O5	0.55%	0.03
SiO2	72.26%	9.06
Fe2O3	4.10%	0.19
MnO	0.01%	-
LOI	5.00%	n/a
Oxide Weight		715.66
Formula Weight		753.32

Notes

A natural high iron, mid-temperature stoneware clay of good plasticity. It is particulary well suited to oxidation bodies in the middle temperature ranges. It is very deep red at cone 7-8.

Fired Temperature, Cone 4 5 6 7 8 9
--------------------------------------
Fired Shrinkage: 3.1% 3.4% 3.7% 4.0% 4.2% 4.4%
Absorption: 6.4% 5.0% 4.0% 3.5% 3.0% 1.9%
Fired Strength:
(lbs/ square inch) 5100 5300 5600 5900 6400

Sieve Analysis Wet Washed
(Root of 2 series) +35 +48 +65 +100 +150# +200 +325
--------------------------------------------
0.0% 0.3% 2.4% 5.1% 7.6% 10.0% 22.2%

Texture: Sl. tooth
Plastic Index (1-10): 5
Green Strength (lbs/sqaure inch): 850
Dry shrinkage: 5.0
Dried density: 2.05
PCE: 15.5

Related Information

Fire-Red and Restone fired test bars

Plainsman Fire-Red (left) fired at cone 8,9,10,11 and 10R and Redstone (right) fired at cone 4,5,6,7,8.

Links

URLs	https://plainsmanclays.com/data/index.php?product=12907 Redstone Data Sheet
Materials	M2 Red Stoneware
Materials	Fire-Red
Materials	Calvert Clay
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.

Data

Pyrometric Cone Equivalent	15

By Tony Hansen
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