Butyltin oxide

Butyltin oxide (CAS 51590-67-1), also known as Monobutyltin oxide and commercially as Tegokat 256, is an organotin compound used as a catalyst and functional additive in polymer and industrial coating systems.

Where is Butyltin oxide used?

• Polymer and plastics processing: catalyst for polyesters and polyurethanes
• Esterification, transesterification and condensation reactions requiring reaction control and thermal stability
• PVC stabilization: precursor to organotin heat stabilizers that protect against thermal degradation during extrusion
• Building and construction: curing silicone sealants and coatings
• Textile and leather finishing: flame-retardant treatments and surface coatings
• It accelerates crosslinking without compromising adhesion to substrates.

Commercial specifications

• Purity typically 95% to 98%+
• Packaging: fiber drums and multi-wall bags