It is a naturally occurring white and acicular mineral, with a Mohs hardness of 4.5. In addition to wollastonite's unique morphology, it is alkaline, inert, has low loss on ignition, low water solubility, a low coefficient of linear thermal expansion, and a melting point of 1540°C. It also improves tear strength, dielectric properties, and retains mechanical properties at elevated temperatures.
Wollastonite is widely used in the ceramic industry, accounting for about 50% of the total domestic use. In the ceramic industry, wollastonite is mainly used to produce art porcelain, sanitary porcelain, glazed tiles, electric porcelain, daily-use porcelain, and chemical ceramics.
| No | Compound | Result % |
|---|---|---|
| 01 | SiO2 | 57.62 |
| 02 | Al2O3 | 0.52 |
| 03 | Fe2O3 | 0.25 |
| 04 | TiO2 | Trace |
| 05 | CaO | 40.13 |
| 06 | MgO | 0.41 |
| 07 | K2O | 0.02 |
| 08 | Na2O | 0.14 |
| 09 | LOSS on ignition | 1.28 |
| Physical Properties | Result % |
|---|---|
| Shrinkage % | 1.18 |
| Loss on Ignition % | 1.37 |
| L* | 96.17 |
| A* | 0.21 |
| B* | 4.78 |
| Whiteness | 90.36 |
| Temperature C | 1188/1205 |
| Cycle Min. | 45 |
| Residue 300# | 4.52 |
