Molda TW 75
Molda TW75 is a hemihydrate formulated plaster used in ceramics to produce working moulds for the slip casting of tableware.
Benefits
High absorption capability
Available in long or short setting time
Technical data
| Chemical Properties | |
|---|---|
| Chemical Composition | CaSO4.½H2O |
| Chemical Name | Calcium Sulphate Hemihydrate |
| Colour | off-white |
| Minimum gypsum purity % | >92 |
| Setting Parameters | |
|---|---|
| Final setting time (minutes) | < 30 |
| Initial setting time (minutes) | 6 - 19 |
| Mechanical Properties | |
|---|---|
| Flexural Strength (MPa) | >4.0 |
| Physical Properties | |
|---|---|
| Loose bulk density (kg/m³) | 620 - 720 |
| Particle Size (% weight retained) |
< 6.0% at 63 µm < 1.0% at 90 µm |
| Plaster to Water Ratio | |
|---|---|
| Plaster to water mix ratio (by weight) | 100/75 |
| Plaster to Water Ratio (by weight) | 1.33:1 |
| Water to plaster ratio ( by weight) | 75% |
Instructions for use
The recommended plaster to water ratio is between 1.33:1 and 1.5:1, with a mixing time of approx. 2 to 4 minutes, depending on batch size. Mixing utensils should always be clean and free from set plaster. Use distilled water only. For consistent results, attention must be given to the correct proportioning and mixing of the plaster and water. Add the weighed quantity of plaster slowly into the measured volume of water and allow to soak. Do not mix fresh plaster with that which has been mixed for some time previously. Changes to plaster to water ratio will influence product performance, particularly setting time, strength and absorption capability.
Packaging and shelf life
Bag
Packaging available : 25 kg
Shelf life : 6 months
Bulk Bag
Packaging available : 1.05 T
Shelf life : 6 months