NEW YORK COMPENSATION INSURANCE NEW YORK MANUAL FOR WORKERS' COMPENSATION AND RATING BOARD EMPLOYERS' LIABILITY INSURANCE CLASSIFICATION CODE INTERPRETATIONS Note: Description: Code 4751 applies to employers engaged in manufacturing 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. Assignment By Analogy: Caulking and sealing compounds or materials Operations To Be Separately Rated: 1. Synthetic rubber intermediate manufacturing. Refer to Code 4829 “Chemical Mfg. – NOC – All Operations & Drivers.” Printed On: 10/01/2021.