Product Description
Wollastonite is a calcium metasilicate mineral with the chemical composition CaSiO₃, presenting as an acicular (needle-like) powder. Its crystal system is triclinic, forming fine plate-like crystals, with aggregates occurring in radial or fibrous habits. The mineral is white with a slight grayish tint and exhibits a vitreous luster. It has a specific gravity of 2.9, a Mohs hardness of 4.5, and a refractive index ranging from 1.63 to 1.67. In general, it demonstrates good resistance to acids, alkalis, and chemical corrosion.
Technical Indicators
| Item | Value |
|---|---|
| Silicon Dioxide | 49.0±2.0 |
| Calcium Oxide | 46.0±2.0 |
| Ferric Oxide | ≤0.2 |
| Moisture Content | ≤0.5 |
| Coefficient of Linear Thermal Expansion (CLTE) | 6.5×10⁻⁶ |
| Item | Value |
|---|---|
| Value | 7-9 |
| Oil Absorption Value | 18-30 |
| Whiteness | ≥90 |
| Residue on 45μm Sieve | ≤0.5 |
Complete technical data available upon request.
Product Usage
Usage: As a filler in plastics, it is primarily used to improve tensile strength and flexural strength while reducing costs. In the papermaking industry, this product serves as a filler and is compounded with plant fibers to produce composite papermaking fibers, partially replacing plant fibers.
Packaging: 25 kg/bag, in paper-plastic composite bags. Alternative packaging options are also available upon customer request.