Crystacal Extra Fine is a very high strength hemihydrate plaster produced from high purity gypsum. This product is used as a very high strength additive in proprietary formulations (especially for Type 4 dental formulation or plaster bandages).
Very strong mechanical properties
Very fine particle size distribution
| Mechanical Properties | |
|---|---|
| Brinell Hardness (MPa) | 190 |
| Dry compressive strength (Mpa) | 52 |
| Wet Compressive strength (Mpa) | 25 |
| Chemical Properties | |
|---|---|
| Chemical Composition | CaSO4.½H2O |
| Chemical Name | Calcium Sulphate Hemihydrate |
| Colorimeter (a value) | 0.3 |
| Colorimeter (b value) | 3.5 |
| Colorimeter (L value) | 92 |
| Colour | White |
| Final setting time (minutes) | 7 |
| Physical Properties | |
|---|---|
| Compacted bulk density (kg/m3) | 1350 |
| Loose bulk density (kg/m³) | 900 |
| Particle Size Distribution (mesh size and % weight retained) | 0.0% at 63µm | 5.0% at 32µm |
| Setting Parameters | |
|---|---|
| Initial setting time (minutes) | 4 |
| Linear Expansion (%) | 0.45 |
| Plaster to Water Ratio | |
|---|---|
| Plaster to water mix ratio (by weight) | 100/35 |
| Plaster to Water Ratio (by weight) | 2.86:1 |
| Water to plaster ratio ( by weight) | 35% |
As an ingredient in proprietary formulations.
Packaging available : 25kg
Shelf life : 9