Esperox 10 Tertiary-butyl peroxybenzoate 614-45-9 Crompton Crosslinking / Coupling / Curing Agents >> Peroxides / Persalts / Hydroperoxides Polyesters Esperox® 10 tertiary-Butyl Peroxybenzoate Esperox® 10 peroxide is a high purity liquid monoperoxyester (tertiary-Butyl Peroxybenzoate) used for the polymerization of vinyl monomers and unsaturated polyester resins. It is widely used as source of free radicals for the polymerization of ethylene and styrene. High purity liquid monoperoxyester. Used for the polymerization of vinyl monomers and unsaturated polyester resins and as a source of free radicals for the polymerization of ethylene and styrene.