C-1 Clay

Alternate Names: C1 Clay

Description: Plastic, White, Wall Tile

Oxide	Analysis	Formula
CaO	1.32%	0.16
K2O	1.73%	0.12
MgO	0.51%	0.09
Na2O	0.20%	0.02
Al2O3	15.09%	1.00
SiO2	74.43%	8.37
Fe2O3	0.41%	0.02
LOI	6.30%	n/a
Oxide Weight		633.29
Formula Weight		675.87

Notes

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

PSD:
94% passing 40 microns
86% 30 microns
74% 20
66% 15
59% 10
54% 7.5
48% 5
45% 4
43% 3
38% 2
31% 1

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)

Related Information

Links

Typecodes	Clay Other Clays that are not kaolins, ball clays or bentonites. For example, stoneware clays are mixtures of all of the above plus quartz, feldspar, mica and other minerals. There are also many clays that have high plasticity like bentonite but are much different mineralogically.

By Tony Hansen
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