Monobutyltin oxide
CAS 2273-43-0
EC 218-880-1
Formula C4H10O2Sn
MW 192.83 g/mol
Organometallic Compounds Plastics & PolymersBuilding & ConstructionTextile, Leather & Paper CatalysisCross-linking & Curing
Description
Monobutyltin Oxide (CAS 2273-43-0, EC 218-880-1), also known as Butylstannoic Acid or Butylstannonic Acid, is an organotin compound with the molecular formula C4H10O2Sn. It carries no assigned E-code and is classified under HS code 2931.90.9029 within the Catalysts and Catalyst Precursors category.
In polyester and alkyd resin production, Monobutyltin Oxide functions as a condensation catalyst, accelerating esterification reactions at elevated temperatures without significant side-product formation. It is also used in textile and leather finishing as a cross-linking agent, where it promotes covalent bonding between polymer chains to improve durability and chemical resistance.
Monobutyltin Oxide is supplied as a powder or crystalline solid and is subject to REACH registration requirements for European procurement. Buyers should confirm supplier REACH compliance documentation and SDS availability. Standard packaging formats vary by supplier; consult your account manager for available quantities and grades.
In polyester and alkyd resin production, Monobutyltin Oxide functions as a condensation catalyst, accelerating esterification reactions at elevated temperatures without significant side-product formation. It is also used in textile and leather finishing as a cross-linking agent, where it promotes covalent bonding between polymer chains to improve durability and chemical resistance.
Monobutyltin Oxide is supplied as a powder or crystalline solid and is subject to REACH registration requirements for European procurement. Buyers should confirm supplier REACH compliance documentation and SDS availability. Standard packaging formats vary by supplier; consult your account manager for available quantities and grades.
Physical Properties
| Melting Point | 210 °C |
| Boiling Point | 350 °C |
| Density | 1,46 g/cm 3 |
| Appearance | White infusible solid. Sol in Me 2 CO. |
| Color | White to Almost white |
| Form | powder to crystal |
| Water Solubility | 317-3200μg/L at 20℃ |
| Vapor Pressure | 24.4Pa at 25℃ |
| Log P | 0.2-1.477 at 20-25℃ |
Trade & Regulatory
| HS Code | 2931.90.9029 |
| Storage Class | 6.1C - Combustible, acute toxic Cat.3 toxic compounds or compounds which causing chronic effects |
| WGK (Germany) | 1 |
Other Names
Butyltin oxideButylstannoic AcidButylstannonic acidButanestannonic acidN-BUTYLSTANNOIC ACIDbutylhydroxytinoxideButylhydroxytin oxide1-butanestannonicacid
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