REAXIS® C248DP (Dibutyltin Oxide + Plasticizer) is a liquid version of dibutyltin oxide, also known as DBTO, which contains a high molecular weight phthalate-based plasticizer. This variant of dibutyltin oxide contains 40% of the active tin content compared to the solid version of DBTO, REAXIS® C248. Other liquid versions of dibutyltin oxide using phthalates as the diluent include REAXIS® C248D and REAXIS® C248DN. Liquid versions of DBTO-based silanes include REAXIS® C248VM and REAXIS® C248T. Other liquid grades are available upon request.
|Tin Content (%)||20.0 - 23.0|
|Color (Gardner Number)||4 Max|
|Density (g/ml)||1.14 - 1.16|
|Viscosity (cP @ 20°C)||1000 - 3000|
REAXIS® C248DP and its alternatives can be used as a homogenous tin 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® C248DP is commonly used with formulations based on SMP resins such as MS Polymer®. REAXIS® C248DP 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® C248DP tends to be a highly reactive catalyst across a broad range of silicone formulations. In regard to silicone reactions, REAXIS® C248DP, like all tin-based catalysts, will catalyze the silanol/silane condensation reaction thus acting as both a polymerization and crosslinking catalyst. In addition to reactivity, REAXIS® C248DP is more hydrolytically stable toward condensation-generated moisture. Reactivity-wise, REAXIS® C248D, REAXIS® C226, and REAXIS® C248DN would be similar.
REAXIS® C248DP should be stored in the original packaging. The container should be closed tightly after each use to maximize shelf life.