Reaxis®  C218


Reaxis C218/Dibutyltin Dilaurate, is one the most commonly used specialty metal-based catalysts for polyurethanes and silicone condensation reactions. With a long history of usage in a wide range of formulations, Reaxis C218/Dibutyltin Dilaurate is a good benchmark catalyst when starting development work on new formulations. Typically supplied in a neat liquid form, it can be supplied in a wide range of diluents including amines, silanes, and plasticizers.


Reaxis C218/Dibutyltin Dilaurate is a work-horse catalyst used primarily in polyurethane and silicone chemistries. It also can be used as an esterification and transesterification catalyst. Reaxis C218/Dibutyltin Dilaurate can be used in a wide range of applications within the above mentioned chemistries, including: coatings, adhesives and sealants, elastomers, foams and plastics. Given the lubricious nature of tin metal, Reaxis C218/Dibutyltin Dilaurate is used in select lubricant formulations.


Reaxis C218/Dibutyltin Dilaurate provides for good overall reactivity. In regard to polyurethanes, a good balanced cure is achievable given the presence of both a low tin metal content and large ligand. Thus, a balanced front-end/pot-life and back-end/ final cure reactivity profile can be achieved in for example, 2K polyurethane coatings. Reaxis C218/Dibutyltin Dilaurate, is a carboxylate specialty metal based catalyst that is built with a biobased ligand and thus color formation is possible especially when heat is added or generated. Typical of the organotin carboxylate family of catalysts, Reaxis C218/Dibutyltin Dilaurate will catalyze most polyurethanes reactions; it is primarily selective toward the polyol-isocyanate and water-isocyanate reactions. Reaxis C218/Dibutyltin Dilaurate is hydrolytically stable within typical formulation moisture levels, but this stability will break down with increasing moisture content.

Request A Sample

Reaxis® C218 - Product Details


  • Tin Content (%) 18.0 Min
  • Density (g/ml) 1.03 - 1.07
  • Refractive Index (nD @20°C) 1.469 - 1.476
  • Acid Number (mgKOH/g) 165 - 180
  • Color (Gardner Number) 4 Max

Standard Packaging

  • 44 lb (20 kg) plastic pails
  • 485 lb (220 kg) steel drums


  • Chemical Name  Dibutyltin Diluarate
  • CAS Number  77-58-7
  • Physical state  liquid
  • Chemical type  dibutyltin
  • Viscosity (cP@20°C)  35 - 60

Storage Conditions

REAXIS® C218 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.

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.

Reaxis R Logo

Question About Our Products?

Are you unsure of what you are looking for? We want to hear your story. Maybe we can become a part of it.

Speak With An Expert