Plainsman Red Fireclay
Chemistry
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Volatiles
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Links to Other Materials
Miscellaneous
- Family: Clay Other
- Region: None
- Mined At: Unspecified
- Raw Mineral: No
- Generic: No
Notes
This is a material being developed by Plainsman as a more suitable subsitute for Newman firelcay than FireRed (samples should be available in July 2003). FireRed is a 50:50 mix of a non-plastic red fireclay and a plastic red stoneware with 15% of a highly bentonitic and iron speckled ball clay. This material differs from FireRed in that:
-it is ground finer reducing the coarser particle sizes up to 60 mesh, but it is actually coarser in the finer particle size range
-it employs the red fireclay only with 20% of a cleaner ball clay
This mix has a lower iron content than Newman so we will either recommend an addition or add it here.
Red Fireclay is ground to 60 mesh and is finer than Newman clay in the +65 mesh range
(thus there are none of the larger impurity grog-like particles common in Newman).
However in the minus 65 mesh range this material has a much better distribution of particle sizes.
In a test body containing 50% Newman, 25 feldspar, 15 ball clay and 10 silica the following was found:
-The Newman version felt smoother on the potters wheel with scattered larger
particles
-Both generated about the same amount of slip during throwing.
-The Newman version is brighter red in the raw state and messier to work with.
-The Newman version has up to 1% higher drying shrinkage yet its drying
performance (resistance to cracking) is a little better.
-The Newman version is not quite as plastic.
-The Newman version had significantly lower dry strength (this body was quite
non plastic, thus more than 15% ball clay is needed).
-The Newman version fired significantly redder but when 1.5% iron was added to the Plainsman Red Fireclay and the test rerun the fired color was the same.
Data
- Sieve Analysis Dry
+48 mesh: 0-0.1%
48-65: 0-0.3
65-100: 0.2-1.0
100-150: 3.0-5.0
150-200: 6.0-8.0
200-325: 7.0-9 - Sieve Analysis Dry
+48 mesh: 0-0.1%
48-65: 0-0.3
65-100: 0.2-1.0
100-150: 3.0-5.0
150-200: 6.0-8.0
200-325: 7.0-9
Suppliers
- Plainsman Clays
Authors
- Tony Hansen (Owner)
XML
<?xml version="1.0" encoding="UTF-8"?>
<material name="Plainsman Red Fireclay" descrip="" generic="0" rawmineral="0" searchkey="" loi="0.00">
<families>
<family name="Clay Other"/>
</families>
<oxides>
<oxide symbol="BaO" name="Barium Oxide, Baria" status="" percent="0.300" tolerance=""/>
<oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.500" tolerance=""/>
<oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.200" tolerance=""/>
<oxide symbol="K2O" name="Potassium Oxide" status="" percent="0.300" tolerance=""/>
<oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="0.100" tolerance=""/>
<oxide symbol="P2O5" name="Phosphorus Pentoxide" status="" percent="0.100" tolerance=""/>
<oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="1.000" tolerance=""/>
<oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="16.600" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="66.000" tolerance=""/>
<oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="6.900" tolerance=""/>
<oxide symbol="MnO" name="Manganous Oxide" status="" percent="0.100" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="" name="" percent="7.900" tolerance=""/>
</volatiles>
<references>
<reference name="seealso" reason=""/>
<reference name="seealso" reason=""/>
<reference name="seealso" reason=""/>
<reference name="seealso" reason=""/>
<reference name="seealso" reason=""/>
<reference name="seealso" reason=""/>
</references>
<suppliers>
<supplier name="Plainsman Clays" country="CA" url="http://www.plainsmanclays.com" label=""/>
</suppliers>
<notes>
<note>This is a material being developed by Plainsman as a more suitable subsitute for Newman firelcay than FireRed (samples should be available in July 2003). FireRed is a 50:50 mix of a non-plastic red fireclay and a plastic red stoneware with 15% of a highly bentonitic and iron speckled ball clay. This material differs from FireRed in that:
-it is ground finer reducing the coarser particle sizes up to 60 mesh, but it is actually coarser in the finer particle size range
-it employs the red fireclay only with 20% of a cleaner ball clay
This mix has a lower iron content than Newman so we will either recommend an addition or add it here.
Red Fireclay is ground to 60 mesh and is finer than Newman clay in the +65 mesh range
(thus there are none of the larger impurity grog-like particles common in Newman).
However in the minus 65 mesh range this material has a much better distribution of particle sizes.
In a test body containing 50% Newman, 25 feldspar, 15 ball clay and 10 silica the following was found:
-The Newman version felt smoother on the potters wheel with scattered larger
particles
-Both generated about the same amount of slip during throwing.
-The Newman version is brighter red in the raw state and messier to work with.
-The Newman version has up to 1% higher drying shrinkage yet its drying
performance (resistance to cracking) is a little better.
-The Newman version is not quite as plastic.
-The Newman version had significantly lower dry strength (this body was quite
non plastic, thus more than 15% ball clay is needed).
-The Newman version fired significantly redder but when 1.5% iron was added to the Plainsman Red Fireclay and the test rerun the fired color was the same.</note>
</notes>
<testdata>
<testitem testname="6" value="+48 mesh: 0-0.1%
48-65: 0-0.3
65-100: 0.2-1.0
100-150: 3.0-5.0
150-200: 6.0-8.0
200-325: 7.0-9"/>
<testitem testname="6" value="+48 mesh: 0-0.1%
48-65: 0-0.3
65-100: 0.2-1.0
100-150: 3.0-5.0
150-200: 6.0-8.0
200-325: 7.0-9"/>
</testdata>
</material>
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