EPK Edgar Plastic Kaolin:
Edgar Plastic Kaolin, commonly known as EPK , is possibly the most common material in the ceramics industry. It is used in pottery glaze formulas which call for kaolin, and many moist clay porcelain pottery clay recipes.
It is a unique, high quality, water washed, ceramic kaolin which offers very white fired color, unusually good forming characteristics and high green strength.
In glazes, EPK offers excellent suspension capabilities and uncommon cleanliness.
At Sheffield Pottery we offer small quantities of kaolin for studios and we offer bulk pricing discounts up to 26,000 pounds on EPK kaolin for large scale needs such as white-ware production or cosmetics. This clay is a fine dry powder.
EPK Typical Analysis
|
Chemical Analysis: |
SiO 2 |
45.73% |
CaO |
0.18 |
|
|
Al 203 |
37.36 |
Mgo |
0.098 |
|
|
Fe 2O3 |
0.79 |
Na 2O |
0.059 |
|
|
TiO 2 |
0.37 |
K 20 |
0.33 |
|
|
P 205 |
0.236 |
LOI |
13.91 |
|
Mineral Content (X-Ray Diffraction): |
Kaolinite (Al 203, 2SiO2, 2H20) - 97% |
|
Screen Residue(Water washed through screen): |
Pellet (Prill): .339 +325 mesh Airfloated: .245 +325 mesh |
|
Specific Surface Area (m2/g): |
28.52 |
|
Median Particle Size (Microns): |
1.36 |
|
Free Moisture: |
Pellet (Prill) 3.0% Airfloated 1.0% |
EPK Ceramic Properties
|
pH (10% Solids-Wt.): |
5.8 |
|
Viscosity: |
10,000 CPS @ 35% solids (wt.) |
|
Water of Plasticity: |
26.0% |
|
Dry Modulus of Rapture |
300 psi |
|
Linear Dry Shrinkage: |
5.8% |
|
Fired Shrinkage Cone 11: (1315oC) |
11.6% |
|
Absorption - Cone 11: (1315oC) |
11.3% |
|
Cation Exchange Capacity (Methylene Blue Index): |
4.5 meq./ 100 grams |
|
Fired Color (100% Clay, Cone 11): |
95.1 |
EPK Casting Properties
|
Drainage: Excellent |
Type of Cast: Plastic |
Water Retention: 24.81% |
The information and data contained herein are believed to be accurate, but the manufacturer makes no warranty with respect thereto and disclaims responsibility for reliance thereon. This data relates only to the specific material described herein, and does not relate to use in connection with any other materials or in any process.
Edgar Minerals, Inc. makes no warranties, express or implied, concerning this product. No warranty of fitness for any particular purpose is made and we assume no responsibility whatever for any use of this product. This product should be used by properly trained personnel, and in compliance with applicable health and safety laws and regulations.
WARNING:The product contains free Silica (Quartz). Repeated and prolonged inhalation of dust in excess of TLV-TWA may cause delayed lung injury (Silicosis). Follow applicable OSHA, MSHA, or NIOSH standards for Crystalline Silica (Quartz), IARC has classified Crystalline Silica in Group 2A of Probable Carcinogens based on limited evidence for the carcinogenicity of Crystalline Silica to humans- The National Toxicology Program has listed crystalline silica (respirable) as a substance which may reasonably be anticipated to be a carcinogen.
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