Crystacal Alpha K is a formulated hemihydrate plaster (CaSO4.1/2H2O) produced from naturally occurring high purity gypsum mineral. It is white in colour. It is used for the production of fine detailed and high strength giftware and models
exceptionally high strength and surface hardness
low expansion
excellent reproduction of detail
supplied in plastic drums
shelf life of 12months
| Mechanical Properties | |
|---|---|
| Brinell Hardness (MPa) | 400 |
| Dry compressive strength (Mpa) | 97 |
| Wet Compressive strength (Mpa) | 55 |
| Physical Properties | |
|---|---|
| Bulk density (compacted) kg / m³ | 1350 |
| Loose bulk density (kg/m³) | 900 |
| Particle Size (% weight retained) |
0.0 % at 63 µm 1% at 32 µm |
| Chemical Properties | |
|---|---|
| Chemical Composition | CaSO4.1/2H2O |
| Chemical Name | Calcium sulphate hemihydrate |
| Colorometer a* value | 0.4 |
| Colorometer b* value | 3.5 |
| Colorometer L* value | 92 |
| Colour | White |
| Setting Parameters | |
|---|---|
| Final setting time (minutes) | 28 |
| Initial setting time (minutes) | 25 |
| Linear Expansion (%) | 0,12 |
| Plaster to Water Ratio | |
|---|---|
| Plaster to water mix ratio (by weight) | 100/21 |
| Plaster to Water Ratio (by weight) | 4.76:1 |
| Water to plaster ratio (by weight) | 21% |
Please use with the recommended plaster water ratio, with a mixing time of approx. 2 to 4 minutes or with a mix until homogenous.The precise consistency to use will need to be adjusted to suit the individual application. Changes to plaster to water ratio will influence product performance particularly setting time and strength.
Packaging available : 25 kg
Shelf life : 12