RTV-2 silicone rubbers are two-component systems that cure at room temperature via an addition reaction (hydrosilylation) between vinyl groups in the BRB Vinyl Dimethicones (serving as the base polymer) and Si-H groups of the BRB Crosslinker series, typically in the presence of a platinum catalyst. BRB Vinyl Dimethicones are the perfect building blocks for these systems and largely determine the processing behavior, curing kinetics, and physical-mechanical performance.

The role of bimodal distribution in an RTV-2 has become increasingly recognized as a key factor in optimizing viscosity, tensile strength, and dimensional stability. This article provides a technical analysis of that role.