MBTO (monobutyltin oxide) is used as an ingredient for the polyvinyl chloride resin stabilizer and catalysts for esterification and transesterification.

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Chemical name Monobutyltin oxide
CAS number 2273-43-0
METI number 2-2269
Molecular formula C4H10O2Sn
Molecular weight 209
Structural formula Molecular weight: 209
Classification by functional group, compound Hydroxyl group (Alcoholic hydroxy group)
Melting point (°C) 210°C
Aqueous solubility Insoluble



Monobutyltin oxide, as a resin additive or resin chemical, is used for the following purposes:

  • Polyvinyl chloride resin stabilizer ingredient
  • Esterification and transesterification catalysts

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