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Whitfield & Son Ltd are a major supplier of fine grade Plaster of Paris to the world's ceramic industry and are able to offer grades to suit the majority of manufacturing processes.
Our range of plaster for modelling and case-mould production is based upon Alpha hemi-hydrate giving a combination of correct expansion coupled with hardness which is ideally suited for this purpose. |
| We can offer Beta plasters with very high purity, which have been produced especially for moulds used for casting, particularly in the sanitaryware and bone china industries. |
| Careful blending of Alpha and Beta plasters enables us to offer a wide range combining good absorption and permeability, together with high strength and superior mould life, suitable for jollying, jiggering and casting. We also supply special grades of plaster used in self levelling floors, and for roofing and acoustic tiles. |
Typical setting times for Standard Grade Plaster:
Initial set 6-10 mins.
Final set 18-30 mins.
The plaster/water ratios given are the indicated levels for typical use. Higher or lower levels can be used depending upon customer needs and application.
The use of a vicat ring is recommended to help determine the correct time to pour the plaster
e.g. 21-22cms for typical plasters.
Please contact our Technical Sales Department for assistance. |
| Grade |
Porosity
% |
Typical Ratios |
Expansion
% |
Compression
Strength |
Brinell
Hardness |
Use |
Market |
| P/W |
W/P |
lb/pt |
Psi |
N/mm² |
| Casting |
48 |
130 |
0.77 |
1lb 10oz |
<0.15 |
1160 |
20 |
Fibrous moulding |
|
| Cerecast |
47 |
135 |
0.44 |
1lb 11oz |
<0.15 |
1595 |
20 |
Simple casting (SST) |
Sanitaryware |
| Normal |
44 |
140 |
0.71 |
1lb 12oz |
<0.15 |
1740 |
27 |
Double (and treble casting) (LST) |
Sanitaryware |
| Procast+ |
44 |
140 |
0.71 |
1lb 12oz |
<0.15 |
1740 |
27 |
Double (and treble casting) (SST) |
Sanitaryware |
| Cerafine |
44 |
140 |
0.71 |
1lb 12oz |
<0.15 |
1740 |
27 |
Casting and roller (SST) |
Tableware |
| W |
43 |
140 |
0.71 |
1lb 12oz |
<0.15 |
1740 |
27 |
Simple casting & double casting (LST) |
Sanitaryware |
| Classic |
44 |
145 |
0.69 |
1lb 13oz |
<0.15 |
1740 |
27 |
Fibrous moulding |
|
| Millecast |
43 |
140 |
0.69 |
1lb 13oz |
<0.15 |
1885 |
27 |
Casting (roller with high W/P) (SST) |
Tableware |
| Advantia |
43 |
145 |
0.69 |
1lb 13oz |
<0.15 |
1885 |
27 |
Double or more casts (LST) |
Sanitaryware |
| Ceram IS |
40 |
150 |
0.67 |
1lb 14oz |
<0.15 |
2030 |
32 |
Double or more casts short set MFM |
Sanitaryware |
| Normal Plus |
41 |
150 |
0.67 |
1lb 14oz |
<0.15 |
2030 |
32 |
Double or more casts (MST) |
Sanitaryware |
| Ceram |
37 |
160 |
0.63 |
2lb |
<0.15 |
2320 |
40 |
Double cast especially. for fire clay (LST) |
Sanitaryware |
| Ceram 1 |
37 |
160 |
0.63 |
2lb |
<0.15 |
2320 |
40 |
Casting and roller (SST) |
Tableware |
| Ceram 1H |
37 |
160 |
0.63 |
2lb |
<0.15 |
2320 |
40 |
Casting and roller (SST) |
Tableware |
| Milleroll |
34 |
170 |
0.58 |
2lb 2oz |
<0.15 |
2756 |
50 |
Primary roller (SST) |
Tableware |
| Creation |
32 |
200 |
0.50 |
2lb 2oz |
<0.25 |
3626 |
70 |
Fibrous moulding and decorative |
|
| T36 |
15 |
280 |
0.36 |
3lb 8oz |
<0.15 |
4786 |
145 |
Tile pressing (SST) |
Tile industry |
| Form |
13 |
290 |
0.34 |
3lb 10oz |
<0.20 |
5511 |
150 |
Ram press (LST) |
Tableware |
| Millepress |
13 |
300 |
0.33 |
3lb 12oz |
<0.20 |
5511 |
150 |
Ram Press (LST) |
Tableware |