Spinks HC#5 Clay

Alternate Names: Spinks #5, Spinks No. 5, Spinks HC5

Description: White burning, low carbon for plastic bodies

Oxide	Analysis	Formula
CaO	0.27%	0.02
K2O	0.31%	0.01
MgO	0.21%	0.02
Na2O	0.10%	0.01
TiO2	1.59%	0.07
Al2O3	27.65%	1.00
P2O5	0.14%	-
SiO2	56.25%	3.45
Fe2O3	1.13%	0.03
MnO	0.02%	-
LOI	12.40%	n/a
SO3	0.03%	n/a
Oxide Weight		323.41
Formula Weight		369.32

Notes

This ball clay is very white firing and is quite similar to the popular Old Hickory #5 material, infact it was developed to emulate it. It is thus also a good choice to suspend glazes. Amounts of only 15% are needed in a recipe having no other clay materials, however beware not to use too much or the glaze will gel.

Relative Viscosity (1.2 Sp. Gr.):* 1.29
Casting Rate: (gms per 15 min/426 cm2):* 242
Water of Plasticity:* 21.2
% Dry Shrinkage:* 5.14
Dry M.O.R., psi:* 230

Cone 04 8 11
----
Fired Shrinkage:* 0.1% 1.5% 2.1%
Absorption:* 16.9% 14.0% 12.6%
M.O.R. psi:* 1758 2830 5863

Thermal Expansion, Cone 8: .335% at 700C
P.C.E.: 32+
pH: 4.2
Oil Absorption: 32
Bulk Density, lbs per cubic foot: 35-40
Particle Size, Microns: 20 10 5 2 1 0.5 0.2
93% 82% 65% 44% 30% 18% 6%

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

Related Information

Links

Materials	No. 5 Ball Clay
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
Follow me on

Got a Question?

Buy me a coffee and we can talk