Hays Special Clay

Alternate Names: Hays Special Ball Clay

Description: Ball Clay

Oxide	Analysis	Formula
CaO	0.20%	0.01
K2O	0.98%	0.04
MgO	0.34%	0.03
Na2O	0.21%	0.01
TiO2	1.37%	0.07
Al2O3	25.30%	1.00
P2O5	0.07%	-
SiO2	60.00%	4.02
Fe2O3	1.30%	0.03
MnO	0.01%	-
LOI	10.15%	n/a
SO3	0.05%	n/a
Oxide Weight		361.96
Formula Weight		403.07

Notes

Relative Viscosity (1.2 Sp. Gr.):* 1.29
Casting Rate: (gms per 15 min/426 cm2):* 208
Water of Plasticity:* 20.6
% Dry Shrinkage:* 4.75
Dry M.O.R., psi:* 447

Cone 04 8 11
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Fired Shrinkage:* 0.0% 1.5% 2.3%
Absorption:* 22.1% 15.6% 10.6%
M.O.R. psi:* 1930 3420 5349

Thermal Expansion, Cone 8: .475% at 700C
P.C.E.: 31
pH: 5.4
Oil Absorption: 36
Bulk Density, lbs per cubic foot: 35-40
Particle Size, Microns: 20 10 5 2 1 0.5 0.2
95% 90% 81% 60% 42% 25% 5%

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

Related Information

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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.

By Tony Hansen
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