Class Code: 4751
Per NCCI's Scopes Code Description:
Code 4751 is applied to insureds engaged in the manufacture of synthetic rubber such as Buna-S, styrene-butadiene rubber, acrylonitrile rubber, butyl rubber, cold rubber, neoprene, polysulfide rubbers and polyurethane foams and rubber. Styrene, butadiene, acrylonitrile, isobutene isoprene, chloroprene, soap, ferrous sulfate, liquid hydrocarbon, dodecyl mercaptan, liquid toluene-diisocyanate, polyoxy-propylene glycol and catalysts such as peroxide and aluminum chloride are received from others in drums, via tank cars, or the chemicals may be piped in from tank farms. The raw materials vary depending upon the synthetic rubber being produced. The processing of the most common type of synthetic rubber involves co-polymerization of butadiene with styrene. These materials are suspended in finely divided emulsion form with a large proportion of water with soap and an initiator or catalyst and a mercaptan. At the end of this polymerization process, the water contains suspended finely divided globules of synthetic rubber. The unreacted starting materials are vaporized and recovered for recycling. A rubber stabilizer may be added to the globules, followed by coagulation by adding sodium chloride. The crumbs of synthetic rubber are then filtered, washed, dried and compressed into blocks or slabs. In the production of butyl rubber, the additional operation of vulcanization may be performed. All synthetic rubbers are shipped to manufacturers of rubber products.