Dioctyltin oxide

Dioctyltin oxide (CAS 870-08-6), commonly abbreviated as DOTO, is an organotin compound used as a catalyst and flame retardant in polymer and coating systems.

Where is Dioctyltin oxide used?

• Polyurethane and silicone systems: catalyzes condensation and crosslinking reactions, enabling controlled cure profiles in sealants and elastomers
• Industrial protective coatings: improves adhesion and durability
• PVC and thermoplastic compounding: stabilizer-catalyst combination that helps processors manage thermal degradation during high-temperature extrusion
• Adhesives: flame retardancy alongside structural bonding performance
• It accelerates curing reactions and improves thermal stability in industrial formulations.

Good to know: Technical grade is the standard commercial form, with purity specifications commonly ranging from 95% to 99% depending on the intended application. Proper storage in a cool, dry environment is recommended to maintain chemical stability.

Commercial specifications

• Purity: 95% to 99% (technical grade)
• Bulk supply in fiber drums or multi-layer bags; smaller packaging options for laboratory or specialty formulation use