REAXIS® C248D (Dibutyltin Oxide + Plasticizer) is a liquid version of dibutyltin oxide (DBTO) containing a phthalate-based plasticizer. REAXIS® C248D contains 50% of the active tin catalyst content compared to the solid version of DBTO, REAXIS® C248. Other liquid versions using phthalates as the diluent include REAXIS® C248DP and REAXIS® C248DN. Liquid versions of DBTO-based silanes include REAXIS® C248VM and REAXIS® C248T. Other liquid grades are available upon request.
|Tin Content (%)
|23.0 - 25.0
|Refractive Index (nD @20°C)
|1.5028 - 1.5109
|1.160 - 1.220
|Color (Gardner Number)
REAXIS® C248D and its alternatives can be used as a homogeneous catalyst in a wide spectrum of silicone and polyurethane applications including adhesives, sealants, and elastomers. 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 polyurethanes, REAXIS® C248D is typically used in adhesive, sealant, or elastomer formulations given the presence of a plasticizer.
Given its high tin content, liquid form, and good compatibility with a wide range of raw materials, REAXIS® C248D tends to be a highly reactive catalyst across a broad range of silicone and polyurethane formulations. In regard to silicone reactions, REAXIS® C248D, like all tin-based catalysts, will catalyze the silanol/silane condensation reaction thus acting as both a polymerization and crosslinking catalyst. Typical of the organotin family of catalysts, REAXIS® C248D will catalyze most polyurethane reactions; it is primarily selective toward the polyol-isocyanate and water-isocyanate reactions. REAXIS® C248D is hydrolytically stable within typical formulation moisture levels, but this stability will break down with increasing moisture content.
REAXIS® C248D should be stored in the original packaging. The container should be closed tightly after each use to maximize shelf life.