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Description and features

Viacat 4100 (Monobutyltin Oxide) is a white powder which has C4H10O2Sn as chemical formula. It is an non-corrosive organotin compound which can be used in the synthesis of saturated polyester in powder coatings, insulating varnishes and coil coatings.

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


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.

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

Product Identification

CAS number 2273-43-0
EC number 218-880-1
HS code 2931 90 00
Sensitivity Not hygroscopic


Appearance White powder
Tin content 54.80 – 59.50 %
Chlorine content ≤1.00 %
Volatility ≤1.00 %


ViaCat 4100 (MBTO) 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.


Available packaging: 25 KG fiber drums.
Special packaging is available on request.


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.


A Material Safety Data Sheets (MSDS) is available for ViaCat 4100 (MBTO) qnd all other products supplied by Vesta Chemicals 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.

Molecular and structural information

Molecular formula C4H10O2Sn
Molecular weight 208.83 g/mol
Smiles notation C([Sn](O)=O)CCC
Chemical formula2273-43-0

Physicochemical information

Boiling point >350 °C
Density 1.46 g/cm3
Flash point 116.00 °C
Auto ignition temperature -510 °C
Partition coefficient (log Pow) 0.20
Solubility in water Insoluble (< 0.1 mg/l)
Vapour pressure 0.0000013 kPa

Monobutyltin Oxide | CAS: 2273-43-0 | 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.