Bandy Black

Description: For casting slips

Oxide	Analysis	Formula
CaO	0.09%	0.01
K2O	1.69%	0.07
MgO	0.12%	0.01
Na2O	0.36%	0.02
TiO2	1.29%	0.07
Al2O3	24.50%	1.00
P2O5	0.07%	-
SiO2	61.00%	4.23
Fe2O3	0.99%	0.03
MnO	0.01%	-
LOI	9.74%	n/a
SO3	0.11%	n/a
Oxide Weight		375.19
Formula Weight		416.19

Notes

This product was discontinued by H. C. Spinks Clay Company in 2003, it is no longer available. It was used as a coarse ball clay, therefore, contributing to fast slip casting, as well as strength, therefore reducing the tendency to crack after casting or break during handling (usually coarse ball clays are limited in their contribution to strength). It was discontinued because more the industry was interested in blended products that included a larger range of particle sizes. That means a user required only 2 or 3 ball clays for their formulas (instead of 4 or 5) thereby saving space and inventory costs.

Relative Viscosity (1.2 Sp. Gr.):* 1.26
Casting Rate: (gms per 15 min/426 cm2):* 258
Water of Plasticity:* 23.2
% Dry Shrinkage:* 3.2
Dry M.O.R., psi:* 328

Cone 04 8 11
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Fired Shrinkage:* 0.0% 3.6% 6.2%
Absorption:* 21.9% 14.3% 6.9%
M.O.R. psi:* 303 3690 5320

Thermal Expansion, Cone 8: .375% at 700C
P.C.E.: 31
pH: 4.1
Oil Absorption: 32
Bulk Density, lbs per cubic foot: 37-45
Particle Size, Microns: 20 10 5 2 1 0.5 0.2
92% 84% 69% 44% 25% 11% 3%

*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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