Dioctyltin oxide

Dioctyltin oxide (CAS 870-08-6), commonly abbreviated as DOTO, is an organotin compound used as a catalyst and flame retardant across polymer and coating systems. It functions primarily to accelerate curing reactions and improve thermal stability in industrial formulations.

In polyurethane and silicone systems, DOTO catalyzes condensation and crosslinking reactions, enabling controlled cure profiles in sealants and elastomers. Coating formulators use it to improve adhesion and durability in industrial protective coatings.

Where heat resistance is a processing requirement, this compound provides essential stability. In PVC and thermoplastic compounding, it acts as a stabilizer-catalyst combination, helping processors manage thermal degradation during high-temperature extrusion.

Adhesive manufacturers incorporate DOTO where flame retardancy requirements must be met alongside structural bonding performance. This versatile chemical ensures that materials maintain their integrity under rigorous manufacturing conditions and environmental stress.

Dioctyltin oxide is typically supplied as a white to off-white powder or paste. Technical grade is the standard commercial form, with purity specifications commonly ranging from 95% to 99% depending on the intended application.

Bulk supply is available in fiber drums or multi-layer bags, with smaller packaging options for laboratory or specialty formulation use. Proper storage in a cool, dry environment is recommended to maintain the chemical stability of the product.