Methyltin Mercaptide丨CAS 57583-35-4

Product Introduction:

Catalog No.: SS132256
CAS No.: 57583-35-4
Tin content (%): 19.23
Product Name: Methyltin mercaptide
Certificate: REACH
Molecular Formula: C22H44O4S2Sn
Molecular Weight: 555.4
Synonym(s): Dimethyltin bis(2-ethylhexylmercaptoacetate); Methyl Tin Stabilizer

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Technical Parameters

Description

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Specifications

Appearance:	Clean & oily liquid
Color (t-Co):	50 max
Specific Gravity (20 °C):	1.160–1.190 g/cm³
Viscosity (25 °C):	20–80 mPa·s
Tin content:	18.5%–19.5%

Applications

1. PVC Heat Stabilizer

Used primarily as a thermal stabilizer in rigid and flexible PVC formulations.

Prevents dehydrochlorination and discoloration of PVC during high-temperature processing (e.g., extrusion, molding).

2. Plastic Pipes and Profiles

Commonly applied in PVC pipes, window profiles, siding, sheets, and other construction materials.

Ensures long-term color and mechanical property retention in outdoor and high-temperature environments.

3. Cable Insulation and Wire Coatings

Enhances the thermal stability and flame resistance of PVC used in electrical wire insulation and jackets.

4. Foamed PVC Products

Used in the manufacture of PVC foam boards and insulation panels to maintain product integrity during high-heat processing.

Benefits

Excellent Heat Stability: Provides outstanding resistance to thermal degradation and yellowing during processing.

Improves Processability: Enhances melt stability, allowing higher processing temperatures and better surface finish.

Transparency: Offers low coloration, suitable for clear or lightly colored PVC products.

Compatibility: Easily blends with plasticizers, lubricants, and other additives in PVC formulations.

Long-Term Durability: Delays aging and enhances weatherability in finished PVC products.

Conclusion

Methyltin mercaptide (CAS 57583-35-4) is a highly effective organotin heat stabilizer used in the production of PVC-based materials, especially in applications demanding high thermal stability and clarity. Its strong performance in rigid PVC products, such as pipes, profiles, and cables, makes it a staple in the plastics industry. While offering substantial benefits in processing and product quality, it must be handled carefully due to its organotin content.