Technical Specifications
Description
A white earthenware body for throwing and pressing with
precise thermal expansion for accurate glaze fit. This body is able to be used
as a vitreous middle fire body at high temperatures.
Mesh : 80#
Recommended Firing
|
Bisque |
Glaze Earthenware |
Glaze Middle Fire |
|
1000° C to 1060° C |
1080° C to 1130° C |
1225° C to 1250° C |
|
Orton Cone 06 to 04
at 150° C per hour |
Orton Cone 03½ to 1
at 150° C per hour |
Orton Cone 6 to 8
at 150° C per hour |
Coefficient of Expansion
Sample fired at 1100° C, Orton cone 03. Linear expansion is
0.380% at 500° C and coefficient is 83.33 x 10-7 from 200° C to 500° C
|
Chemical Analysis |
Shrinkage (fired) |
|
SiO2 |
73.99% |
From wet to dry |
2.3% |
± 0.5% |
|
Al2O3 |
17.96% |
From dry to bisque |
0.2% |
± 0.2% |
|
TiO2 |
0.69% |
From bisque to glaze |
1.0% |
± 0.5% at 1100° C
Orton cone 03 |
|
Fe2O3 |
0.53% |
From bisque to glaze |
5.0% |
± 0.5% at 1250° C
Orton cone 6 |
|
CaO |
3.73% |
|
MgO |
0.60% |
Water absorption |
|
Na2O |
0.57% |
Biscuit |
1000° C |
Orton Cone 06 |
14% |
|
K2O |
1.42% |
Fired |
1225° C |
Orton Cone 6 |
less than 2% |
|
L.O.I. |
7.78% |
Fired |
1250° C |
Orton Cone 7 |
0% |
Glazes
101 is our standard clear lead free glaze for White
Earthenware. See Walkers Earthenware glaze range for functional and decorative
glazes. If making your own glazes contact us for technical assistance if
required.
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 millimetre 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
Neil Scott, Alkoomi Pots
20 Reis Street Woollongabba 4102 Queensland Australia Phone
073 391 1706
"White Earthenware is a great production earthenware
body. We largely produce flatware and domestic ware with bright coloured
decoration using lead free clear glaze. We once fire all our ware in a 9 to 10
hour (firing and cooling) cycle. We observe almost nil faults in this firing
method. White Earthenware is instrumental in our product range and it's
flexibility makes it a pleasure to use and recommend."
