•The secret to cool bodies and glazes is a lot of testing.
•The secret to know what to test is material and chemistry knowledge.
•The secret to learning from testing is documentation.
•The place to test, do the chemistry and document is an account at https://insight-live.com
•The place to get the knowledge is https://digitalfire.com

Sign-up at https://insight-live.com today.

CusterMica

muscovite mica

Alternate Names: DakotaPure Mica

OxideAnalysisFormula
CaO0.70%0.080
MgO1.30%0.206
K2O6.60%0.448
Na2O2.50%0.258
P2O50.20%0.009
Al2O327.10%1.697
SiO246.80%4.975
Fe2O33.10%0.124
FeO1.20%0.094
LOI5.00
SO30.02
Oxide Weight571.77
Formula Weight601.99
If this formula is not unified correctly please contact us.
DENS - Density (Specific Gravity) 2.66
HMOH - Hardness (Moh) 2.5
SADR - Sieve Analysis Dry A200 Grade: +100: 0.3 +200: 20.4 +325: 35.3 A140 Grade: on 80#: 1.0% on 200#: 58.0%
BDLB - Bulk Density lbs/cu. ft. (Packed) 33.2-A200, 30.9 A-140
pHPW - pH for dry powder 8.0

Available in various sizes. It is added to terra cotta clay bodies to create sparkles. Standard grades are much too fine for this effect, use the drilling mud grades (the flakes heal leaks the way platelets do in the blood stream). These are called LCM Drilling Mud Mica.

The analysis provided here does not add up to 100 and the manufacturer does not provide an LOI. The highest LOI we can find on a typical mica is 5%, so this was used. Either the other numbers need to be scaled up to total 95 or the LOI set to 10.0 to account for unspecified volatile materials.


Sparkles on clay. Is that possible?

Sparkles on clay. Is that possible?

An example of how a small addition of mica affects the fired appearance of a terra cotta clay. The effect is still working at cone 03 (left) but is more commonly employed at cone 06 (right). Notice that it is still visible even under the glaze. This body is popular on the west coast, it was designed by D'Arcy Margesson. Standard grades of mica are too fine for the effect, this is likely Custer LCM Drilling Mud Mica.

Out Bound Links


By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="CusterMica" descrip="muscovite mica" searchkey="DakotaPure Mica" loi="0.00" casnumber="12001-26-2"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.700" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="1.300" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="6.600" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="2.500" tolerance=""/> <oxide symbol="P2O5" name="Phosphorus Pentoxide" status="" percent="0.200" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="27.100" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="46.800" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="3.100" tolerance=""/> <oxide symbol="FeO" name="Ferrous Oxide" status="" percent="1.200" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="5.000" tolerance=""/> <volatile symbol="SO3" name="Sulfur Trioxide" percent="0.020" tolerance=""/> </volatiles> </material>


Feedback, Suggestions

Your email address

Subject

Your Name

Message


Copyright 2003, 2008, 2015 https://digitalfire.com, All Rights Reserved