Reaxis®  C233 - Dibutyltin Diacetate

REAXIS® C233 (Dibutyl Tin Diacetate), also commonly known as dibutyltin diacetate or DBTA, is a butyl-based organotin with a carboxylate functionality.  REAXIS® C233 is a highly reactive neat liquid butyl tin given its high tin content (33%) and related small ligand. DBTA REAXIS® C233 contains the highest concentration of all liquid butyl tin products of the tin (IV) family of organotins.  Similar products to DBTA include REAXIS® C218 (Dibutyltin Dilaurate), REAXIS® C317 (Dibutyltin bis-(2-ethylhexyl maleate), and REAXIS® C221 (Dibutyltin Dineodecanoate). The octyl-based organotin analog of REAXIS® C233 is REAXIS® C228 (Dioctyltin Diacetate).


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Technical Information

  • Product Category Organotin

  • Chemical Name Dibutyltin Diacetate

  • CAS Number 1067-33-0

Typical Specifications

Parameter Range
Tin Content (%) 32.5 - 35.0
Density (g/ml) 1.25 - 1.40
Viscosity (cP @ 20°C) 10 - 20
Color (Gardner Number) 3 Max
Refractive Index (nD @20°C) 1.465 - 1.480

International Regulatory Listings

  • TSCA (US) Yes

  • DSL (Canada) Yes

  • REACH (EU) Yes

  • AICS (Australia) Yes

  • KECI (South Korea) Yes

  • IECSC (China) Yes

  • ENCS (Japan) Yes

  • TCSI (Taiwan) Yes

  • NZloC (New Zealand) Yes

  • PICCS (The Philippines) Yes

  • NDSL (Canada) No


REAXIS® C233 and its alternatives can be used as a homogenous tin catalyst in a wide spectrum of polyurethane and silicone applications including adhesives and sealants, elastomers and plastics, and coatings. Silicone-based applications include: acetoxy-, ethoxy- and oxime-based Room Temperature Vulcanizing (RTV) adhesives and sealants, polyethylene crosslinked silanes (PEX), and select silane modified polymers (SMPs). In regard to polyurethane applications, REAXIS® C233 can be used for most related applications including coatings, adhesives and sealants, elastomers, and foams. REAXIS® C233 is on a broad range of international regulatory lists and is thus an ideal candidate for global formulation development. 


Given its high tin content, liquid form, small ligand, and good compatibility with a wide range of raw materials REAXIS® C233 tends to be a highly reactive catalyst across a broad range of silicone and polyurethane formulations. In regard to silicone reactions, REAXIS® C233, like all tin-based catalysts, will catalyze the silanol/silane condensation reaction thus acting as both a polymerization and crosslinking catalyst. REAXIS® C233 is used in polyurethane coating formulations where “snap cure” is desired. As a polyurethane catalyst, REAXIS® C233, will preferentially catalyze the urethane reaction and to a lesser extent the water reaction, thus it functions as a polymerization/gelation catalyst.  Reactivity-wise, REAXIS® C325 (Dimethyltin Dineodecanoate) would be similar. 




Package & Storage

  • 55 lb (25 kg) Pails
  • 440 lb (200kg) steel drum

REAXIS® C233 should be stored in the original packaging at moderate temperatures and kept from freezing. The container should be closed tightly after each use to maximize shelf life. Characteristic of most Sn (IV) organotins, the primary cause of instability would be hydrolysis. Hydrolysis results in the formation of tin oxide insolubles leading to deactivation.

Safety and Handling

Before use of Reaxis products please refer to the relevant Safety Data Sheet (SDS) for safety and toxicological data as well as for the information on proper transportation, storage, and use. SDSs are available by request via our web site, contacting your local representative, or emailing direct to

Hazard Classification (US SDS)

Section Hazard Class Category Hazard Statement
A.2 skin corrosion/irritation 1B H314
A.3 serious eye damage/eye irritation 1 H318
A.4S skin sensitization 1B H317
A.5 germ cell mutagenicity 2 H341
A.7 reproductive toxicity 1B H360FD
A.8 specific target organ toxicity - single exposure 1 H370
A.9 specific target organ toxicity - repeated exposure 1 H372

Hazard Pictograms (US SDS)


Transportation Information (US SDS)

DOT IMDG ICAO Environment Hazard
Un Number UN 3265 UN 3265 UN 3265 hazardous to the aquatic environment
UN Proper Shipping Name Corrosive liquid, acidic, organic, n.o.s. IMDG-Code CORROSIVE LIQUID, ACIDIC, ORGANIC, N.O.S. Corrosive liquid, acidic, organic, n.o.s.
Transport Class 8 8 8
Packing Group ll ll ll

Primary Composition Substance(s)

  • dibutyltin di(acetate)

Alternative Product(s) to Consider

This information is provided to the best of our knowledge but without obligation. Reaxis is not liable for any incorrect or missing information. This data sheet becomes invalid upon publication of a new version. Please contact us for the latest version.

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