5A White Technical Specifications
Description
A cream firing stoneware body ideal for throwing and hand
building.
Mesh : 60#
Recommended Firing
|
Bisque
|
Glaze
|
|
1000° C |
1280° C to 1300° C |
|
Orton Cone 06 |
Orton Cone 9 to 10 |
|
at 150° C per hour |
at 150° C per hour |
Coefficient of Expansion
Sample fired at 1280° C, Orton cone 9. Linear expansion is
0.335% at 500° C and coefficient is 70.3 x 10-7 from 200° C to 500° C.
| Chemical Analysis |
Shrinkage (fired) |
|
SiO2 |
70.96% |
From wet to dry |
2.0% |
± 0.5% |
|
Al2O3 |
22.63% |
From dry to bisque |
1.2% |
± 0.2% |
|
TiO2 |
0.70% |
From dry to glaze |
7.0% |
± 0.5% at 1300° C |
|
Fe2O3 |
2.24% |
|
CaO |
0.20% |
Water absorption |
|
MgO |
0.61% |
Biscuit |
1000° C |
Orton Cone 06 |
16.0% |
|
Na2O |
0.58% |
Fired |
1300° C |
Orton Cone 10 |
3.0% |
|
K2O |
2.08% |
|
L.O.I. |
6.14% |
Glazes
Decorative (non-functional) glazes are available in the Walker
Ceramics Stoneware glaze range.
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.
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