Overview
Calcium silicate (耐火硅酸钙) is a versatile inorganic compound primarily used for its refractory and insulating properties. It occurs naturally as wollastonite but is often synthesized for industrial applications. Its high melting point and low thermal conductivity make it ideal for high-temperature environments. In construction, calcium silicate boards are favored for fireproofing and thermal insulation. The material is also used as a filler in plastics, paints, and ceramics due to its stability and compatibility with other compounds.
Physical and Chemical Properties
Calcium silicate is chemically inert under normal conditions but reacts with strong acids to form silica gel and calcium salts. Its fibrous form (wollastonite) provides mechanical strength, while powdered forms are used for their thermal properties. The compound’s density (2.9 g/cm³) and melting point (1540°C) make it suitable for refractory linings in furnaces and kilns. Its insolubility in water ensures durability in humid environments, though prolonged exposure to moisture can reduce efficacy.
Main Applications
The primary use of calcium silicate is in refractory materials for steelmaking, glass production, and cement kilns. Its ability to withstand temperatures up to 1000°C without degradation is critical in these industries. Additionally, it serves as insulation in pipes, boilers, and building panels. In consumer goods, it acts as an anti-caking agent in food and pharmaceuticals (approved by regulatory bodies) and as a reinforcement filler in automotive parts.
Safety and Storage
While non-toxic, calcium silicate dust can irritate the respiratory system. Workers should use NIOSH-approved masks and ensure proper ventilation. Gloves and goggles are recommended to prevent skin or eye contact. Store in sealed containers away from moisture and acidic substances. Bulk storage should prioritize dry, cool conditions to prevent clumping or chemical reactions. Shelf life is indefinite if stored correctly.
B2B Procurement Guide
For industrial procurement, specify purity (≥95%), particle size (e.g., 200 mesh for fillers), and thermal stability (test reports). Suppliers should provide CAS 1344-95-2 certification and SDS documentation. Prices vary by form (powder, board) and quantity. Bulk orders (20+ metric tons) may reduce costs by 10–15%. Partner with suppliers specializing in refractory materials for tailored solutions, such as custom-shaped insulation boards.
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