Technical Specifications
Description
White Raku & Tile Body is a hardy, fine clay ideally suited for the hand
building of large or small work, tiles, slab building, sculpting and throwing.
It has good strong thermal shock stability
characteristics and polishes well.
Mesh : 30#
Recommended Firing
| Bisque |
Glaze |
|
1000° C |
800° C to 1300° C |
|
Orton Cone 06
at 150° C per hour |
Orton Cone 06 to 10
at 150° C per hour |
|
Chemical Analysis |
Shrinkage (fired) |
|
SiO2 |
63.78% |
From wet to dry |
4.25% |
± 0.5% |
|
Al2O3 |
23.62% |
From dry to bisque |
1.0% |
± 0.2% |
|
TiO2 |
0.86% |
From dry to glaze |
2.0% |
± 0.5% @ 1080° C |
|
Fe2O3 |
1.22% |
From dry to glaze |
8.5% |
± 0.5% @ 1300° C |
|
CaO |
0.22% |
|
MgO |
0.58% |
Water absorption |
|
Na2O |
0.61% |
Biscuit |
1000° C |
Orton Cone 06 |
|
K2O |
1.85% |
Fired |
1300° C |
Orton Cone 10 |
|
L.O.I. |
7.27% |
Glazes
Decorative (non-functional) glazes are available in the
Walkers Raku, Earthenware and Stoneware glaze ranges.
Presentation
Fully de-aired 10 kilogram block wrapped in recyclable
polythene bags.
Moisture content of standard clay is 22% to 24%, PR 3 to 4.
Other moisture contents are available on special request using
our Penetrometer Readings (PR) outlined below.
|
PR |
Consistency |
|
2 to 3 |
Soft |
|
3 to 4 |
Ideal throwing |
|
5 to 6 |
Firm throwing, slab work |
|
7 to 10 |
Slab, pressing or extruding |
Preparation
Crude clays are blunged, sieved and passed over rare earth
magnets, then stored in constantly agitated farm tanks. Final body blend is made
with millimeter accuracy with powdered raw materials being added and agitated
in. With this manufacturing method we can ensure reproducible recipe formulation
to within 0.1%. Final body in liquid form is sieved and passed over rare earth
magnets once again and then filter pressed. Filter pressed clays are then stock
piled in cake form and allowed to age. Extruding takes place through a de-airing
pugmill and clay is sealed airtight in polythene bags which can be stored
indefinitely.
Potter's Comments
Jeff Mincham - Professional Potter and Raku
Specialist from Cherryville · South Australia.
"An exceptionally tolerant & versatile clay with
outstanding shock resistant properties. Excellent for raku & pit firing. With multiple firing
capabilities it can also be fired well into the stoneware range. Ideal for both modeling & hand building techniques it has the added bonus of throwing
particularly well. In recent testing by students at the South Australian School
of Art it revealed an exceptional capacity to develop a polished surface. An exciting new clay especially for potters working in the
raku area."
