Alfamolde 4
Alfamolde 4 is a high strength, low expansion plaster used to produce case and block moulds for the production of ceramic ware.
Plaster
| Chamotte |
| Al2O3 content (%) |
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Open porosity (%) |
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| Vitreous phase (%) |
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Pyroscopic resistance (°C) |
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| Apparent density |
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| Plaster |
| Chemical composition |
CaSO4½H2O |
Linear expansion (%) |
0.1 |
| Chemical name |
Calcium sulphate hemihydrate |
Colorimeter L (L* value) |
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| Plaster to water mix ratio (by weight) |
100/30 |
Colorimeter a (a* value) |
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| Plaster to water ratio (by weight) |
3.33:1 |
Colorimeter b (b* value) |
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| Water to plaster ratio (by weight) |
30% |
Colour |
white |
| Fluidity / spread (cm) |
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Sieve analysis (Mesh size & % weight retained) |
+ 200 microns :trace, + 100 microns : 1.3% |
| Initial setting time (minutes) |
18 |
Bulk density loose (kg / m³) |
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| Final setting time (minutes) |
24 |
Bulk density compacted (kg / m³) |
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| Wet compressive strength MPa |
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Apparent bulk density (g/cm³) |
1 |
| Dry compressive strength MPa |
45 |
Pore volume (%) |
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| Flexural strength MPa |
10 |
Start of warming phase (minutes) |
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| Brinell hardness MPa |
120 |
End of warming phase (minutes) |
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| Hardness shore D |
85 |
Shelf life (Months) |
6 |
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| Refractory Investments |
| Water used (%) |
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Liquid Density |
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| Mixing Time (minutes) |
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Linear Expansion 1 hour after setting (%) |
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| Working / Casting Time (minutes) |
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Linear Expansion 2 hours after setting (%) |
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| Initial Setting Time (minutes) |
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Shelf Life (months) |
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| Gypsum |
| Chemical composition |
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pH |
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| Chemical name |
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Solubility of Gypsum (g/ litre) |
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| Minimum Gypsum purity (%) |
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Bulk density loose(kg/cm³) |
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| Sieve analysis (mesh size & % weight retained) |
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Bulk density compacted (kg/cm³) |
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| Colorimeter L (L* value) |
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Apparent bulk density |
[] |
| Colorimeter a (a* value) |
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Gypsum hardness (MOH scale) |
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| Colorimeter b (b* value) |
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Shelf life |
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| Colour |
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Please refer to product data sheets for futher information