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Alternate Names: Plainsman FireRed
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SADR - Sieve Analysis Dry | +48 mesh: 0.5-1.0% 48-65: 2.0-4.0 65-100: 3.0-5.0 100-150: 4.0-6.0 150-200: 5.0-7.0 200-325: |
GSPT - Frit Softening Point | PCE 17 |
WABS - Water absorption | Cone 4: 9.0-11.0% Cone 6: 7.5-9.5 Cone 8: 6.0-8.0 Cone 10: 5.0-7.0 Cone 10R: 2.0-3.0 |
FSHR - Firing Shrinkage | Cone 4: 3.0-4.0% Cone 6: 3.5-4.5 Cone 8: 4.0-5.0 Cone 10: 4.5-5.5 Cone 10R: 3.0-4.0 |
DSHR - Drying Shrinkage | 6.0-7.0 |
A natural, high iron, high temperature stoneware clay blend of a refractory low plastic red clay, a medium temperature medium plastic red clay and a bentonitic ball clay. Fire-Red has medium plasticity and is thus a plasticity nuetral additive to clay bodies. It is slightly sandy and by itself is a deep, solid red at cone 10R with speckle. It is stable to cone 12+. This material is a better choice for impart red color to medium and high temperature bodies than typical low fire red clays (the latter tend to flux to brown rather than red colors even in bodies with low feldspar).
This material is a possible alternative to Newman red fireclay with caveats.
-This material is more plastic (thus ball clay or bentonite in the recipe can be reduced to compensate)
-Fire-Red is a little more vitreous (thus feldspar can be reduced).
-Fire-Red has a much coarser particle size distribution so homogeneous red burning bodies will look less so and they will have a much more toothy feel.
-Fire-Red has less staining power, you may need to augment it with iron oxide.
Fired Temperature, Cone 6 7 8 9 10 11 10R
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Fired Shrinkage: 3.2% 3.4% 3.6% 3.6% 3.7% n/a n/a
Absorption: 8.2% 8.0% 7.8% 7.5% 7.1% n/a n/a
Fired Strength:
(lbs/ square inch) 3800 4200 4300 4300 4300
Sieve Analysis Wet Washed
(Root of 2 series) +35 +48 +65 +100 +150# +200 +325
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0.1% 0.5% 2.5% 5.0% 6.0% 11.0% 11.0%
Texture: Sl. tooth
Plastic Index (1-10): 5
Green Strength (lbs/sqaure inch): 800
Dry shrinkage: 5.5
Dried density: 2.06
PCE: 16.5
Cone 10R firing of Plainsman Fire-Red (left), St. Rose Red 42 mesh (center) and St. Rose Red 10 mesh (right). The 10 mesh material produces a reduction speckle and deep red color that is very unique.
Plainsman Fire-Red (left) fired at cone 8,9,10,11 and 10R and Redstone (right) fired at cone 4,5,6,7,8.
This can fire almost black on reduction. However, as a pure material, it is prone to dunting as it is high in larger quartz particles.
Out Bound Links
https://plainsmanclays.com/data/index.php?product=12906
Newman Fireclay, Newman Slip
Plainsman M2
In Bound Links
Red Stone