Antimony Trioxide
Antimony Trioxide, CAS 12136-15-1, is a versatile, high-purity inorganic compound primarily utilized as a flame retardant synergist.
Description
Antimony Trioxide (Sb2O3) is a white, odorless, crystalline solid with a molecular weight of 291.52 g/mol. It exhibits two major crystalline forms: cubic (senarmontite) and orthorhombic (valentinite), with the cubic form being more common at room temperature. It is recognized for its synergistic effect when combined with halogen-containing flame retardants, significantly enhancing their efficiency by promoting char formation and altering the combustion process. This mechanism involves the formation of antimony halides at elevated temperatures, which scavenge free radicals in the gas phase, thereby interrupting the flame propagation cycle. Antimony Trioxide is characterized by its very low solubility in water but dissolves in concentrated hydrochloric acid and certain bases. Its high thermal stability makes it suitable for applications requiring processing at elevated temperatures. The particle size and surface area of Antimony Trioxide can be tailored to optimize performance in various polymeric systems.
Applications
Antimony Trioxide is extensively used across numerous industries, primarily due to its flame-retardant properties. It is a critical additive in plastics, including PVC, polypropylene, polyethylene, and engineering plastics, offering enhanced fire safety in consumer electronics, automotive components, and building materials. In textiles, it is applied to fabrics for apparel, drapes, and industrial materials to meet flammability standards. The product also finds use in coatings and paints, providing fire resistance for structural elements and marine applications. Furthermore, Antimony Trioxide acts as a catalyst in polyester production and as a fining agent in glass manufacturing, improving clarity and reducing bubbles. It is also employed as a white pigment in specific applications where opacifying properties are desired.
Storage & Handling
Store Antimony Trioxide in a cool, dry, well-ventilated area, away from incompatible materials. Keep containers tightly closed. Avoid dust generation and accumulation. Handle with appropriate personal protective equipment to prevent inhalation or skin contact. Good housekeeping practices are essential to minimize dust exposure.
Danger
- H301 Toxic if swallowed
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