Reaxis®  C2012 M70 - Dibutyltin Blend

REAXIS® C2012M70 (Dibutyltin bis-(Acetylacetonate)) is a butyl-based organotin with a ketonate functionality.  REAXIS® C2012M70 is a non-phthalate, monomeric plasticizer blended version of REAXIS® C226. The alkylsulphonic phenyl ester-based plasticizer helps to minimize crystallization. REAXIS® C2012M70 is a highly reactive neat liquid butyl tin given its high tin content (18%) and related small ligand. REAXIS® C2012M70 is part of the tin (IV) family of organotins. Due to its ketonate-based ligand, REAXIS® 2012M70 has improved hydrolytic stability when compared to carboxylate functionalized organotins such as REAXIS® C218 (Dibutyl Tin Dilaurate).  In addition to REAXIS® C226, products with similar reactivities include REAXIS® C248D (Dibutyl Tin Oxide), REAXIS® C248DP (Dibutyl Tin Oxide), and REAXIS® C248DN (Dibutyl Tin Oxide). REAXIS® C2012M70 can be diluted with a wide range of both plasticizer types and concentrations.  


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Technical Information

  • Product Category Organotin

  • Chemical Name Dibutyltin Blend

  • CAS Number 22673-19-4

Typical Specifications

Parameter Range
Tin Content (%) 17.5 - 20.0
Color (Gardner Number) 6 Max
Density (g/ml) 1.15 - 1.20


REAXIS® C2012M70 and its alternatives can be used as a homogenous catalyst in a wide spectrum of silicone applications including adhesives, sealants, 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).  REAXIS® C226 is the primary catalyst used with MS Polymer® based formulations.   REAXIS® C2012M70 is on a broad range of international regulatory lists and is an ideal candidate for global formulation development. REAXIS® C2012M70 is on the ECHA’s Substance of Very High Concern (SVHC) making the octyl version, REAXIS® C2013,a better option for use in the EU. 



Given its high tin content, liquid form, small ligand, and good compatibility with a wide range of raw materials, REAXIS® C2012M70 tends to be a highly reactive catalyst across a broad range of silicone formulations. Due to the presence of a diluent and related reduced active catalyst content, REAXIS® C2012M70 tends to be slower in reactivity compared to REAXIS® C2226. In regards to silicone reactions, REAXIS® C2012M70, like all tin-based catalysts, will catalyze the silanol/silane condensation reaction, acting as both a polymerization and crosslinking catalyst. In addition to reactivity, REAXIS® C2012M70 is more hydrolytically stable toward condensation-generated moisture.  Reactivity-wise, REAXIS® C248D, REAXIS® C248DP, and REAXIS® C248DN would be similar. 


Package & Storage

  • 44 lb (20 kg) plastic pail
  • 440 lb (200 kg) drum

REAXIS® C2012M70 should be stored in the original packaging. This product has a tendency to crystallize, thus it is recommended that it be stored at temperatures above room temperature. If crystallization does occur, it is recommended that vented containers are warmed at 30-40C. 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 the formation of tin oxide insolubles leading to deactivation of REAXIS® C2012M70.


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




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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