The FC-340 clay is designed for all types of casting formulas ranging from low fire earthenware to vitreous composition. It has excellent response to deflocculation and a very good casting rate while maintaining plasticity and dry strength qualities. FC-340 can be used as the complete ball clay content in a casting body or used in combination with a fine particle size distribution ball clay to improve the casting properties of the formulation.

Typical Data Sheet
Shipping Point: Gleason, Tennessee
Crude Color Tan to Light Grey 
Dry Modulus of Rupture (psi)* 560 
Wet Sieve Residue, +200 mesh (%) 0.62 
Water of Plasticity (%) 34 
Linear Drying Shrinkage (%) 6.35 
Soluble Sulfates (ppm) 435 
Filtration (ml) 29 
Specific Surface Area (m2/g) 20
CEC/MBI (meq/100 ml) 7.3
pH 5.4 
Particle Size (% less than)
5 Micron
1 Micron
.5 Micron  

Median Particle Diameter (Micron) 1.56 
Carbon (%) 0.99
Sulfur 592

*50% clay/50% flint, cast bars

Silicon Dioxide (SiO2) 58.58
Aluminum Oxide (Al2O3) 27.09 
Iron (Ferric) Oxide (Fe2O3) 1.43 
Titanium Dioxide (TiO2) 1.58 
Calcium Oxide (CaO) 0.16 
Magnesium Oxide (MgO) 0.47 
Sodium Oxide (Na2O) 0.10 
Potassium Oxide (K2O) 1.21 
Loss on Ignition 9.45 


FIRED PROPERTIES Cone 04 Cone 3 Cone 11
Linear Fired Shrinkage (%) 4.2 5.9 7.8
Absorption (%) 16.1 10.7 3.7


NOTICE: All data given and statements and recommendations made herein are based upon our research and are believed to be accurate typical data. However, no guarantee of their accuracy is made or implied. Our products are sold on the condition that the user will evaluate them himself, as well as our formulas and recommendations, to determine their suitability for his own purposes before adoption on a commercial scale. Also, statements as to the use of our products are not to be construed for their use in the infringement of any patent.

Warning: This clay product contains quartz which may cause delayed respiratory disease (silicosis) if inhaled over a prolonged period of time. Avoid breathing dust. Use NIOSH/MSHA approved respirators where TLV for crystalline quartz is exceeded. IARC Monograph Volume 68, 1997 concludes that the respirable fraction of crystalline quartz, causes cancer in humans. Refer to MSDS for complete details.