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Methyl Tin Mercaptide, commonly referred to as Methyl Mercaptan Tin or simply "Tin Stabilizer 181," is the highest-performance organotin heat stabilizer for rigid and flexible PVC processing. With the CAS numbers 57583-35-4 and 57583-34-3 and a tin content of 19±0.5%, it appears as a clear, colorless to pale yellow viscous liquid with excellent compatibility with PVC resin.
Methyl Tin Mercaptide is the industry benchmark for PVC stabilization, outperforming all other stabilizer types — lead salts, calcium-zinc, and even butyl/octyl tin — in thermal stability, initial color hold, and transparency. Its unique chemistry absorbs hydrogen chloride, replaces labile chlorine atoms, and disrupts polyene discoloration, enabling high-temperature processing with zero degradation. FDA and EU food-contact approved, it is the stabilizer of choice for transparent, high-clarity, and safety-critical PVC applications.
【View detailed specifications and grades of Methyl Tin Mercaptide 】
Methyl Tin Mercaptide's unmatched thermal stability and transparency make it irreplaceable in applications where clarity, color precision, and long-term durability define product quality.
Methyl Tin Mercaptide is the definitive stabilizer for crystal-clear PVC sheets, shrink films, blister packaging, and credit card stock. It preserves pristine initial color during high-temperature calendering and prevents yellowing throughout the product life cycle — enabling the high-clarity, glass-like appearance that calcium-zinc and lead stabilizers cannot achieve.
In pressure pipes, chemical piping, and precision fittings, Methyl Tin Mercaptide provides outstanding long-term heat stability and processing safety. Its rapid HCl scavenging prevents autocatalytic degradation during extrusion, ensuring consistent wall thickness, smooth internal surfaces, and compliance with drinking water and chemical transport standards.
For exterior uPVC window and door profiles, Methyl Tin Mercaptide delivers superior weatherability and UV resistance in combination with TiO₂. Its low volatility prevents die plate-out and equipment scaling, reducing maintenance downtime and improving production efficiency.
FDA 21 CFR 178.2010 and EU BGA approved, Methyl Tin Mercaptide is the only high-performance stabilizer suitable for food-grade rigid PVC containers, medical blister packs, IV tubing components, and pharmaceutical packaging where extractables and migration must be minimized.
In rigid and plasticized PVC compound granules for injection molding, Methyl Tin Mercaptide enhances melt flow, shortens cycle time, and produces parts with excellent surface gloss and dimensional stability — from electronic housings to automotive components.
