Potclays White Earthenware Handbuilding

(previously Grogged White)

Pics from March 2020 firing – cone 10 down at the front, soft at the back. Slow cooled in reduction. Naturally fires to white, but dark flecks formed and some colouring of the clay. A green celadon like satin finish glaze formed on the inside.

Manufacturer: Potclays 158-4120

Manufactured using a 158-1141 white earthenware base with sand and grog addition giving medium texture and excellent workability for hand building, sculpting or tiles. Can also be thrown.

Applications: General purpose / tiles / hand building / general domestic / large domestic. Not recommended for slip.
Texture: 4 (1 smoothest, 10 most coarse)
Composition:

SiO2	TiO2	Al2O3	Fe2O3	CaO	MgO	K2O	Na2O	LOI
67.8	0.5	20.4	0.1	0.1	0.6	1.9	1.5	6.5

Fireclay 66%, other clays 17%, grog 16% (#30 - dust)
Shrinkage 9%@1100, 11%@1200
Thermal expansion 0.35%
Vitrification 1180 – 1250C
Firing 1110 – 1250