Alternate Names: C1 Clay
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As of Mar 94 C-1's future availability is in question because a gold mining company holds the lease to the quarry and wants to fill it in with overburden from the gold diggings. Although the company assured its customers that this material would still be available, it appears it no longer is.
C-1 clay is a unique, plastic clay with unusually high dry strength, low firing shrinkage and excellent pressing properties. It has superb plastic properties for a wide variety of applications. It is obtained from a large deposit of hydrothermally altered rhyolitic material located in the Mojave Desert of Southern California. It is an ideal material in combination with talc for the production of ceramic wall tile. The unusual plastic properties of C-1 Clay make it suitable for the manufacture of pottery and other ceramic ware by the plastic forming process. Careful selection of materials during mining and the use of a large blended stockpile assure uniformity of composition and quality.
C1 clay and PV clay as reasonably similar in properties. However, PV clay is whiter and does not have the microfine speck sometimes seen in C1. In addition it is not as plastic and will need to be augmented by a white-firing bentonite.
Specific Gravity: 2.7
Apparent Density: 50 lb/cu ft
Tapped Density: 62 lb/cu ft
200 Mesh retained: 6.0%
Particle shape: Granular
Dry Brightness: 70
pH Value: 8.5
94% passing 40 microns
86% 30 microns
Thermal Expansion: 300C-0.142 - 5.07 x 10-6 in/in/C (20-300C)
650C-0.462 - 7.33 x 10-6 in/in/C (20-650C)
Out Bound Links
Overview of quartz hazards in the ceramic industry and process