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High thermal and hydrolytic stability due to robust Sn–S covalent bonding.
Low volatility and excellent compatibility with high-molecular-weight PVC and polyolefin matrices.
Effective long-term heat stabilizer with synergistic performance in mixed-metal systems.
Reduced tendency for sulfide staining compared to simpler alkyltin sulfides.
Consistent batch-to-batch purity with minimal residual chloride or tin oxide impurities.
Heat stabilization of rigid and flexible polyvinyl chloride (PVC) profiles, pipes, and cables.
Stabilizer component in calcium–zinc–tin hybrid formulations for food-contact compliant PVC films.
Secondary stabilizer in polyolefin-based masterbatches requiring elevated processing temperatures.
Performance enhancer in wire & cable insulation compounds exposed to prolonged thermal stress.
Stabilizing additive in technical-grade PVC used for automotive under-hood components.
| Chemical Type | Organotin thiolate (dialkyltin bis(alkylthiolate)) |
| Product Form | Pale yellow to light amber viscous liquid or semi-solid waxy mass at room temperature |
| Appearance | Clear, homogeneous, free from visible particulates or phase separation |
| Melting Point / Softening Range | 35–45 °C (determined by ASTM D6090) |
| Tin (Sn) Content | 11.8–12.2 wt% (by atomic absorption spectroscopy) |
| Primary Applications | Heat stabilizer for PVC; co-stabilizer in mixed-metal systems |
| Key Features | Low odor, non-volatile, low migration potential in polymer matrices |
| Regulatory Compliance | Conforms to EU REACH Annex XVII restrictions on organotin compounds (exempted for industrial use under Article 67); not intended for toys or childcare articles |
| Common Compatible Systems | Suitability |
| Rigid PVC (K-value 67–72) | Highly Recommended – Excellent dispersion and thermal synergy with Ca/Zn soaps |
| Flexible PVC (DOP/DOA plasticized) | Recommended – Stable performance up to 180 °C; low exudation risk |
| PP/HDPE-based masterbatches | Suitable – Requires carrier resin pre-mixing; effective above 160 °C processing |
| Calcium–zinc–titanate hybrid systems | Highly Recommended – Enhances long-term color hold and reduces early discoloration |
Q1: What is the CAS Registry Number for Dioctyltin Bis(Dodecylthio)?
A: The CAS number is 301-10-0.
Q2: What is the typical dosage range in rigid PVC applications?
A: Recommended dosage is 0.3–0.8 phr (parts per hundred resin), depending on formulation complexity, processing temperature, and required longevity.
Q3: How does Dioctyltin Bis(Dodecylthio) compare to monobutyltin tris(dodecylthio) in performance?
A: It offers higher thermal stability and lower volatility than monobutyltin analogs, with reduced risk of tin depletion during extended extrusion; however, it provides slightly slower initial color protection than triorganotin sulfides.
Q4: Is this compound compliant with FDA 21 CFR or EU Framework Regulation (EC) No 1935/2004 for food-contact applications?
A: It is not approved for direct food-contact use under current FDA or EFSA guidelines; its use is restricted to industrial-grade PVC where final products are not intended for food or beverage contact.
Q5: What is known about extractable tin or dodecylthiol migration under accelerated testing conditions?
A: Migration is significantly lower than short-chain alkyltin stabilizers; validated <50 ppb total tin in 10% ethanol at 40 °C for 10 days (EN 1186-14), confirming suitability for low-migration industrial applications.
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