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High catalytic efficiency in polyurethane and silicone condensation cure systems.
Thermally stable with low volatility under standard processing conditions.
Excellent hydrolytic stability, minimizing premature decomposition during storage.
Precise stoichiometric control enables reproducible reaction kinetics.
Low odor profile compared to alternative organotin catalysts.
Catalyst for room-temperature vulcanizing (RTV) silicone elastomers.
Crosslinking accelerator in tin-catalyzed polyurethane sealants and adhesives.
Stabilizer and co-catalyst in specialty polycondensation reactions involving silanols.
Component in high-performance coating formulations requiring controlled cure profiles.
Intermediate in the synthesis of other organotin derivatives for R&D applications.
| Chemical Type | Organotin compound – dialkyltin oxide |
| Product Form | White to off-white crystalline powder |
| Appearance | Free-flowing, non-hygroscopic solid |
| Melting Point | 260–270 °C (decomposes) |
| Primary Applications | Silicone RTV catalysis, PU sealant crosslinking |
| Key Features | Non-leaching, low migration potential in cured matrices |
| Benefits | Enables fast surface cure without tackiness; compatible with fillers and pigments |
| Regulatory Compliance | REACH registered; compliant with EU RoHS Directive (exemption 6a applicable) |
| Common Compatible Systems | Suitability |
| α,ω-Hydroxyl-terminated PDMS + alkoxysilane crosslinker | Highly Recommended – Delivers rapid, deep-section cure with excellent adhesion |
| Polyether-based polyurethane sealants (with moisture-cure mechanism) | Recommended – Effective at 50–200 ppm; requires humidity control |
| Alkoxy-functional silicone resins | Suitable – Provides moderate cure speed; best combined with auxiliary catalysts |
| Epoxy-silicone hybrid systems | Suitable – Limited reactivity; used primarily as stabilizer rather than primary catalyst |
Q1: What is the CAS Number for Dimethyltin Oxide?
A: The CAS Registry Number is 301-10-0.
Q2: What is the typical recommended dosage range in RTV silicone formulations?
A: Standard loading is 10–100 ppm (relative to total formulation weight), optimized via rheology and cure-depth testing.
Q3: How does Dimethyltin Oxide compare to Dibutyltin Dilaurate (DBTDL) in terms of migration risk?
A: Dimethyltin Oxide exhibits significantly lower extractable tin content post-cure due to its higher molecular weight, thermal stability, and reduced solubility in polar media.
Q4: Is Dimethyltin Oxide approved for food-contact applications?
A: Not approved under FDA 21 CFR or EU Regulation (EC) No. 1935/2004 for direct food contact; intended for industrial and technical use only.
Q5: Does Dimethyltin Oxide require special handling precautions?
A: Yes — handle in well-ventilated areas; avoid inhalation of dust and skin contact; refer to SDS for PPE guidance (gloves, goggles, respirator if airborne dust is generated).
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