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Send EmailWollastonite, Calcium Metasilicate, Calcium Silicate, 1344-95-2
| Parameter | Description |
|---|---|
| Product Name | Wollastonite |
| Chemical Formula | CaSiO₃ |
| CAS Number | 1344-95-2 |
| EC Number | 215-669-4 |
| Mineral System | Monoclinic / Triclinic |
| Natural Appearance | Needle or blade-shaped crystal aggregates, fibrous structure |
| Color | White, cream, gray (depending on impurities) |
| Luster | Vitreous, translucent |
| Molecular Weight | 116 g/mol |
CHEMICAL DESCRIPTION:
Wollastonite is a calcium metasilicate mineral. It is characterized by needle or blade-shaped crystal aggregates and a fibrous structure. Due to its high whiteness, low oil absorption, low thermal expansion coefficient, and asbestos-like fibrous structure, it is a safe mineral that can be used as an alternative to asbestos. It is widely used in ceramic, paint, plastic, rubber, glass, and refractory industries.
| Component | Formula | Theoretical Ratio (%) | Typical Ratio (%) |
|---|---|---|---|
| Calcium Oxide | CaO | 48.3 | ~45 – 48 |
| Silicon Dioxide | SiO₂ | 51.7 | ~48 – 52 |
| Aluminum Oxide | Al₂O₃ | - | < 1 |
| Iron Oxide | Fe₂O₃ | - | < 0.5 |
| Magnesium Oxide | MgO | - | < 1 |
| Manganese Oxide | MnO | - | < 0.1 |
Possible Substitution Elements: Fe, Mn, Mg
| Property | Value |
|---|---|
| Hardness (Mohs) | 4.5 – 5 |
| Specific Gravity | 2.8 – 3.09 g/cm³ |
| Molecular Weight | 116 g/mol |
| Melting Point | 1,540 °C |
| Thermal Expansion Coefficient | 6.5 × 10⁻⁶ mm/°C |
| Solubility in Water | 0.0095 g/100 ml |
| Moisture Content | Max. 4% |
| Refractive Index | α = 1.616–1.640, β = 1.628–1.650, γ = 1.631–1.653 |
| Whiteness | ≥ 90% |
| pH | ~9-10 |
| Quality Grade | Wollastonite Content | Whiteness | Special Conditions |
|---|---|---|---|
| Paint Grade | ≥ 90% | ≥ 90% | - |
| Plastic/Filler Grade | ≥ 95% | ≥ 90% | - |
| Ceramic/Glaze Grade | ≥ 95% | ≥ 90% | - |
| Ceramic Grade | ≥ 90% | - | Max. 4% loss on ignition, max. 0.3% Fe₂O₃ |
| Metallurgical Grade | ≥ 80% | - | 1% Al₂O₃, S/P ratio 0.02 |
| Mineral Wool Grade | - | - | Aspect ratio ≥ 20:1 |
| Sector | Application |
|---|---|
| Ceramic Industry | Prevents cracking, fracture, and thermal expansion; accelerates drying; provides fuel savings |
| Paint Industry | Bright whiteness, smooth surface, low oil absorption |
| Plastic/Rubber | Low viscosity, low dielectric constant, strength enhancer |
| Abrasives | Strength enhancer in discs and grinding wheels |
| Mineral Wool | Sound and heat insulation as asbestos replacement |
| Glass Industry | Additive for brightness and durability |
| Agriculture | Soil conditioner, yield enhancer |
| Refractories | High-temperature refractory materials |
| Adhesives | Adhesive formulations |
| Application | Benefit |
|---|---|
| Low Thermal Expansion | Prevents glaze and body cracking |
| Rapid Drying | Shortens drying time |
| Fuel Savings | Energy efficiency due to low melting temperature |
| Mechanical Strength | Increases fracture resistance |
| Whiteness | Provides high whiteness |
| Asbestos Alternative | Safe fibrous structure |
| Parameter | Information |
|---|---|
| Annual Ceramic Consumption | 7,000 – 8,000 tons |
| Imports | 500 – 1,000 tons (mostly from China) |
| Potential Reserves | Kırşehir Kaman (~8 million tons calcite + wollastonite), Yozgat area possible formations |
| Current Status | No industrial-grade production; quarries not operational |
| Import Sources | China, India, USA, Mexico |
| Parameter | Information |
|---|---|
| Storage Conditions | Dry, enclosed area; protect from moisture |
| Storage Temperature | Room temperature |
| Keep Away From | Moisture, strong acids |
| Shelf Life | Unlimited (under proper storage) |
| Packaging | 25 kg bags, Big Bags, custom upon request |
| Handling Notes | Avoid dust formation; avoid eye and respiratory contact |
Personal Protective Equipment:
Dust mask (P2 or N95)
Safety goggles
Protective gloves
Protective clothing
| Parameter | Value |
|---|---|
| GHS Classification | Not classified (not hazardous) |
| Toxicity | Low |
| Dust Inhalation | Dust inhalation may cause respiratory tract irritation |
| Skin Contact | May cause mild irritation |
| Eye Contact | May cause mild irritation |
| Carcinogenicity | Not classified |
| Ecotoxicity | Low |
| Asbestos Comparison | Can be used as asbestos replacement; safer for health |
SPECIAL ADVANTAGES:
Can be used as asbestos replacement; safer for health
Natural mineral, low toxicity
High whiteness
Low oil absorption
| Parameter | Information |
|---|---|
| Ecotoxicity | Low |
| Bioaccumulation | Not expected |
| Environmental Impact | Low |
| Waste Management | Disposal according to local regulations |
| Recycling | Possible |
| Parameter | Information |
|---|---|
| UN Number | Not classified as dangerous for transport |
| Hazard Class | Not classified |
| Packing Group | Not applicable |
| Proper Shipping Name | Wollastonite |
| Marine Pollutant | No |
| ADR/RID Label | None |
SUMMARY:
Wollastonite (CaSiO₃) is a calcium metasilicate mineral characterized by needle or blade-shaped crystal aggregates and a fibrous structure. It has a Mohs hardness of 4.5-5, specific gravity of 2.8-3.09 g/cm³, and melting point of 1,540 °C. Due to its high whiteness, low oil absorption, low thermal expansion coefficient, and asbestos-like fibrous structure, it is a safe mineral that can be used as an alternative to asbestos.
Key Properties:
| Property | Value |
|---|---|
| Formula | CaSiO₃ |
| CAS No | 1344-95-2 |
| Hardness (Mohs) | 4.5 – 5 |
| Specific Gravity | 2.8 – 3.09 g/cm³ |
| Melting Point | 1,540 °C |
| Molecular Weight | 116 g/mol |
| Thermal Expansion | 6.5 × 10⁻⁶ mm/°C |
CRITICAL WARNINGS:
Asbestos Alternative: Despite its asbestos-like fibrous structure, wollastonite is a safe mineral and can be used as an alternative to asbestos.
Ceramic Advantages: In the ceramic sector, it prevents cracking, fracture, and thermal expansion; accelerates drying; provides fuel savings.
Status in Turkey: No industrial-grade production; quarries are not operational. Annual consumption of 7,000-8,000 tons with 500-1,000 tons imported.
Quality Grades: Different quality grades are available depending on the application (paint, plastic, ceramic, metallurgical, mineral wool).
Dust Control: Wollastonite dust inhalation may cause respiratory tract irritation. Appropriate dust control measures should be taken.
Reserve Status: Approximately 8 million tons of potential reserves exist in the Kırşehir Kaman region.
Important Disclaimer: This Technical Data Sheet (TDS) is for informational purposes only. The information provided is based on available data and is believed to be accurate. However, the user is solely responsible for determining the suitability of the product for their specific applications and for complying with all applicable regulations and safety requirements. For complete safety, handling, storage, and regulatory compliance information, always refer to the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier. All local, national, and international regulations must be followed when working with Wollastonite. Testing prior to use in glaze recipes and ceramic formulations is recommended.