T 1519 (OTTO) Tetraoctylammonium bromide, 99% Cas 14866-33-2 - used as a disinfectant, in surface treatment and preservative in hospitals and industries. T 1519 (OTTO) Tetraoctylammonium bromide, 99% Cas 14866-33-2 - used as a surfactant involved in the synthesis of blue-luminescent silicon nanoparticles in order to get uniform particle size.