Chemical name: Monobutyltin Oxide
CAS number: 2273-43-0

product sheet

Description and features
Viacat 4100 (Monobutyltin Oxide) is a white powder which has C4H10O2Sn as chemical formula. It is mainly used as catalyst in the production of unsaturated polyester resins, saturated polyester resins and polyester polyols. It can also be a catalyst in the production of powder coating resins and polymeric plasticizers.

Monobutyltin Oxide is also known as butylhydroxostannane, butylstannonic acid and butylhydroxytin oxide.

Product information

CAS number2273-43-0
EC number 218-880-1
HS code2931 90 00
SensitivityNot hygroscopic

Molecular and structural information

Molecular formulaC4H10O2Sn
Molecular weight208.83 g/mol
Smiles notationC([Sn](O)=O)CCC
Structural formula:2273-43-0


AppearanceWhite powder
Tin content54.80 - 59.50 %
Chlorine content≤1.00 %
Volatility≤1.00 %

Physicochemical information

Boiling point>350 °C
Density1.46 g/cm3
Flash point116.00 °C
Auto ignition temperature-510 °C
Partition coefficient (log Pow)0.20
Solubility in waterInsoluble (< 0.1 mg/l)
Vapour pressure0.0000013 kPa

Available packaging: 25KG drum
Special packaging is available on request

Shipment Info
Europe and United States: ViaCat 4100 (MBTO) is on stock in our local warehouses in both Europe and United States. Our lead time is about one week if delivered in 25 KG drums.
Canada, South America, South Africa and other markets can also be served, please contact our sales department for more details.

Store Monobutyltin Oxide in a cool, dry and well-ventilated area and in line with legal requirements.
Keep MBTO away from heat sources and oxidizing agents.

This substance (CAS: 2273-43-0) has been registered under REACH (EC) 1907/2006.

A Material Safety Data Sheets (MSDS) is available for ViaCat 4100 (MBTO) and all other products supplied by Vesta Intracon BV. An MSDS describes the hazards of a product and explains how a product can be safely handled, used and stored. Besides it provides important regulatory and emergency response information for the purchased product.

Monobutyltin Oxide: Disclaimer. This information is supplied solely for informational purposes and Vesta Chemicals bv makes no guarantees or warranties, either expressed or implied, with respect to the accuracy and use of this data. All product warranties and guarantees shall be governed by the Standard Terms of Sale. Nothing in this document is legal advice or is a substitute for competent legal advice.