Provided are a method for manufacturing a rubber composition, which method can give a rubber composition provided with excellent reinforcement properties by improving the dispersibility of fibers in a rubber component when the fibers are added to the rubber, a rubber composition obtained using this method, a vulcanized rubber, and a tire. The bridged metallocene compound contains specific substituted cyclopentadienyl and fluorenyl groups which are linked via carbon or silicon atoms. The multiple conductors can also be made of a reduced diameter, resulting in surge protection at a lower device temperature. A heating element and at least one temperature sensor are fastened to the catch trough for heating the source material and controlling its temperature above its melting temperature. The invention also relates to the preparation of the benzimidazole derivatives and pharmaceutical formulations containing them.