Overview
Wollastonite is a naturally occurring calcium silicate mineral with the chemical formula CaSiO3. It is commonly available in bagged form for industrial use, offering ease of handling and storage. The mineral is characterized by its needle-like crystal structure, which enhances its mechanical properties in composite materials. Wollastonite is mined in several countries, including China, India, and the United States. Its high thermal stability and low moisture absorption make it a versatile material for various industrial applications. Bagged wollastonite ensures consistent quality and reduces contamination risks during transportation and storage.
Physical and Chemical Properties
Wollastonite is a white or off-white powder with a density of 2.8-3.1 g/cm³. It has a high melting point of 1540°C, making it suitable for high-temperature applications. The mineral is insoluble in water but can react with strong acids, forming calcium salts and silica. One of the key properties of wollastonite is its acicular (needle-like) particle morphology, which improves the mechanical strength and dimensional stability of composites. Its low coefficient of thermal expansion and high brightness also contribute to its widespread use in ceramics and coatings.
Main Applications
Wollastonite is extensively used in the ceramics industry as a fluxing agent and to reduce shrinkage during firing. In plastics, it acts as a reinforcing filler, improving tensile strength and heat resistance. The construction industry utilizes wollastonite in cement and insulation materials due to its fire-resistant properties. Additionally, wollastonite is employed in paints and coatings to enhance durability and weather resistance. Its use in metallurgy includes slag conditioning and as a substitute for asbestos in friction products. The mineral's versatility makes it a valuable component in many industrial processes.
Safety and Storage
While wollastonite is considered non-toxic, prolonged exposure to dust particles can cause respiratory irritation. It is essential to use personal protective equipment, such as masks and gloves, when handling the material. Proper ventilation in the workplace is also recommended to minimize dust inhalation. Bagged wollastonite should be stored in a dry, cool environment to prevent moisture absorption and clumping. Keep the bags away from incompatible substances, such as strong acids, to avoid chemical reactions. Ensure that storage areas are well-ventilated and free from potential ignition sources.
B2B Procurement Guide
When procuring wollastonite in bags, buyers should prioritize suppliers with certifications such as ISO 9001 to ensure product quality. Key specifications to verify include purity (typically 90-98%), particle size distribution, and packaging integrity. Price negotiations should consider factors like order volume, shipping costs, and payment terms. Bulk purchases often attract discounts, but it's crucial to balance cost savings with storage capacity. Request samples for testing before placing large orders to confirm the material meets your application requirements.
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