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Hazard Predictions

• Polymerization hazard: Polymerization reaction may become intense and may cause pressurization

Certain metallocene compounds (consisting of a transition metal ion bound to two cyclopentadienyl groups) actively polymerize ethylene and other hydrocarbons with terminal carbon-carbon double bonds. Particularly active examples are metallocenes containing zirconium, scandium, yttrium, lanthanum, and other lanthanide metals (atomic numbers 58-71). Most of these can initiate polymerization even in the absence of a cocatalyst (Janiak, C. 2002. Metallocene Catalysts. Kirk-Othmer Encyclopedia of Chemical Technology. (Online)).