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High catalytic efficiency in condensation-cure silicone rubber systems.
Excellent thermal stability up to 200 °C without premature decomposition.
Low volatility and minimal odor compared to alternative tin-based catalysts.
Good solubility in common organic solvents and silicone polymers.
Consistent batch-to-batch performance with strict heavy metal impurity control.
Catalyst for room-temperature vulcanizing (RTV-1 and RTV-2) silicone sealants and adhesives.
Key additive in heat-cured liquid silicone rubber (LSR) formulations.
Stabilizer and crosslinking promoter in polyurethane elastomer synthesis.
Reaction accelerator in esterification and transesterification processes for specialty polyesters.
Component in antifouling coatings for marine applications (subject to regional regulatory approval).
| Chemical Type | Organotin compound — dialkyltin oxide |
| Product Form | Free-flowing white to off-white crystalline powder |
| Appearance | White crystalline solid, odorless or faint characteristic odor |
| Melting Point | 105–115 °C (determined by DSC) |
| Primary Applications | Silicone curing catalyst, polyester transesterification aid |
| Key Features | Non-hygroscopic, low water solubility, high purity ≥98.5% |
| Benefits | Enables precise cure control, reduces post-cure discoloration, improves shelf life of one-part systems |
| Regulatory Compliance | REACH registered; not classified as CMR under EU CLP (as supplied); RoHS compliant |
| Common Compatible Systems | Suitability |
| Alpha,omega-hydroxyl-terminated polydimethylsiloxane (PDMS) | Highly Recommended – Excellent dispersion and catalytic synergy in RTV-2 systems |
| Alkoxy-terminated silicones (e.g., methyltriacetoxysilane) | Highly Recommended – Rapid, controllable cure in moisture-cure sealants |
| Polyester resins (e.g., unsaturated PET derivatives) | Recommended – Effective transesterification catalyst at 140–180 °C |
| Aliphatic polyurethanes (non-aromatic isocyanate prepolymers) | Suitable – Moderate acceleration; requires compatibility testing for pot life |
Q1: What is the CAS Registry Number for Dioctyltin Oxide?
A: The CAS Number is 301-10-0.
Q2: What is the typical usage level in silicone sealant formulations?
A: Standard dosage ranges from 0.05 to 0.5 phr (parts per hundred resin), depending on required cure speed, film thickness, and ambient humidity.
Q3: How does Dioctyltin Oxide compare to Dibutyltin Dilaurate (DBTDL) in terms of volatility and migration?
A: Dioctyltin Oxide exhibits significantly lower volatility and reduced potential for migration due to its higher molecular weight (MW 489.4) and solid state at room temperature, unlike liquid DBTDL (MW 483.2).
Q4: Is Dioctyltin Oxide approved for food-contact applications?
A: It is not authorized under FDA 21 CFR §175.300 or EU Regulation (EC) No 1935/2004 for direct food-contact use; end-product compliance requires full extractable tin testing and regulatory review by the formulator.
Q5: Does it require special handling or storage conditions?
A: Store in a cool, dry place below 30 °C in tightly sealed containers; avoid exposure to moisture and strong oxidizers. Use appropriate PPE (gloves, goggles) when handling powdered form to minimize inhalation or dermal contact.
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