PBX Fireclay

Oxide	Analysis	Formula
SiO2	45.70%	2.49
Al2O3	31.10%	1.00
Fe2O3	6.10%	0.13
MgO	0.23%	0.02
Na2O	0.03%	0.00
K2O	0.11%	0.00
CaO	0.02%	0.00
TiO2	1.70%	0.07
LOI	15.30%
Oxide Weight		278.75
Formula Weight		329.10

Notes

Was used up until the 1970s but has not been available since. This material was popular since it fired to a very warm brown in oxidation and deep brown in reduction.

Related Information

PBX Fireclay fired test bars

Cone 10 reduction (top), cone 10 down to 6 oxidation below that (top to bottom). A refractory material.

Links

Materials	Fireclay
Typecodes	Fireclay Fireclays are non-kaolin non-ball clay materials similar to stoneware clays but lacking fluxing oxides. Many fireclays have a PCE of 28 or more.

By Tony Hansen