White Modelling
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Technical Specifications

Description

A very smooth production body for throwing and hand building firing to an off white colour.

Mesh : 60#

Recommended Firing

Bisque Glaze

1000° C

1080° C to 1300° C

Orton Cone 06

Orton Cone 031/2 to 10

at 150° C per hour

at 150° C per hour

 

 

Chemical Analysis

Shrinkage  (fired)

SiO2

67.04%

From wet to dry

4.0%

± 0.5%

Al2O3

25.71%

From dry to bisque

1.0%

± 0.2%

TiO2

1.49%

From dry to glaze

1.5%

± 0.5% at 1080° C Orton cone 03½

Fe2O3

1.13%

From dry to glaze

9.0%

± 0.5% at 1280° C Orton cone 9

CaO

0.36%

Water absorption

MgO

0.87%

Biscuit

1000° C

Orton Cone 06

16%

Na2O

0.98%

Fired

1300° C

Orton Cone 10

0%

K2O

2.42%

L.O.I.

6.80%

wm gradient chart

Glazes

Decorative (non-functional) glazes are available in the Walkers Earthenware 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 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.