Black Charm Clay

Alternate Names: Ball Charm Ball Clay

Description: Ball Clay

Oxide	Analysis	Formula
CaO	0.33%	0.03
K2O	1.34%	0.06
MgO	0.21%	0.02
Na2O	0.32%	0.02
TiO2	0.20%	0.01
Al2O3	22.66%	1.00
P2O5	0.04%	-
SiO2	62.96%	4.72
Fe2O3	1.53%	0.04
MnO	0.05%	-
LOI	10.52%	n/a
SO3	0.11%	n/a
Oxide Weight		403.50
Formula Weight		451.49

Notes

A coarse-grained engineered blend offering a high degree of moisture retention, plasticity, and naturally occurring organics. Ideally suited for a variety of bonding applications.

Relative Viscosity (1.2 Sp. Gr.):* 1.23
Casting Rate: (gms per 15 min/426 cm2):* 165
Water of Plasticity:* 26.4
% Dry Shrinkage:* 5.55
Dry M.O.R., psi:* 496

Cone 04 8 11
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Fired Shrinkage:* 0.4% 1.5% 2.5%
Absorption:* 21.0% 18.3% 14.8%
M.O.R. psi:* 620 1830 4050

Thermal Expansion, Cone 8: .495% at 700C
P.C.E.: 29
pH: 4.6
Oil Absorption: 32
Bulk Density, lbs per cubic foot: 35-39
Particle Size, Microns: 20 10 5 2 1 0.5 0.2
92% 81% 65% 45% 31% 16% 5%

*Specimens: De-aired, extruded, 50% ball clay, 50% flint

Related Information

Links

Typecodes	Ball Clay Ball clays are abundant and very plastic and are used in all types of plastic forming bodies. They are not as white-burning or refractory as kaolins but lower in iron and fluxes than bentonites.

Data

Pyrometric Cone Equivalent	29

By Tony Hansen
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