REAXIS® C248T (Dibutyltin Oxide + Silane) is a liquid version of dibutyltin oxide (DBTO) which contains a silane and is commonly used as a catalyst for silicone chemistries. REAXIS® C248T contains 50% of the active tin catalyst content compared to the solid version of dibutyltin oxide, REAXIS® C248. Another DBTO-based silanes grade that we offer is REAXIS® C248VM. Liquid versions of REAXIS® C248 utilizing phthalates as a non-reactive diluent include REAXIS® C248DP and REAXIS® C248DN. Other liquid grades are available upon request.
|Tin Content (%)
|22.0 - 23.5
|Color (Gardner Number)
|1.0 - 1.2
REAXIS® C248T and its alternatives can be used as a homogeneous catalyst in a wide spectrum of silicone applications including adhesives & sealants, as well as 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).
Given its high tin content, liquid form, and good compatibility with a wide range of raw materials, REAXIS® C248T tends to be a highly reactive catalyst across a broad range of silicone formulations. REAXIS® C248T, like all tin-based catalysts, will catalyze the silanol/silane condensation reaction, acting as both a polymerization and crosslinking catalyst. REAXIS® C248T is hydrolytically stable within typical formulation moisture levels, but this stability will break down with increasing moisture content.
REAXIS® C248T should be stored in the original packaging at moderate temperatures. The container should be closed tightly after each use to maximize shelf life. Given the presence of a silane, hydrolytic instability could occur resulting in reduced catalytic performance.