Description and features

Viacat 4101 (Butyltin chloride dihydroxide) is one of several organotin compounds which are active as an esterification catalysts at a temperature range of 200 – 230 °C. It is a non-acidic white solid which has C4H11ClO2Sn as chemical formula. It dissolves by reaction on heating with alcohols or carboxylic acids. The resulting active is soluble in ester systems and remains in the ester product.

Viacat 4101 is recommended for preparation of esters such as trioctyltrimellitate and unsaturated and saturated polyester. In addition Viacat 4101 is used in the production of powder coating resins.

Butyltin chloride dihydroxide is also known as butylchlorodihydroxytin and butyl(chloro)stannanediol.


Europe and united States: ViaCat 4101 ➔ on stock in our local warehouses. 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.

➔ Limited available in the European Union as this product has not been REACH registered (yet).

Product Identification

CAS number 13355-96-9
EC number 236-406-1
HS code 2931 90 80
IUPAC Name: butyl(chloro)stannanediol


Appearance White powder
Tin content 46.00 – 51.00 %
Chlorine content 13.80 – 15.2 %
Loss on drying ≤2.00 %


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


Store butyltin chloride dihydroxide in a cool, dry and well-ventilated area and in line with legal requirements.
Keep it away from heat sources and oxidizing agents.


A Material Safety Data Sheets (MSDS) is available for ViaCat 4101 and 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 C4H11ClO2Sn
Molecular weight 245.27 g/mol
Smiles notation [Sn](Cl)(O)(O)CCCC
Structural formula

Physicochemical information

Boiling point >300 °C
Density 1 g/cm3
Flash point 100.89 °C
Melting point 144 °C
Partition coefficient (log Pow) 5.83
Solubility in water Insoluble (< 0.1 mg/l)
Vapour pressure 1.10 hPa @ 25°C
Butyltin chloride dihydroxide | CAS: 13355-96-9 | 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.