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- ...ub>6</sub> presents environmental, health, and safety risks because of its chemical instability. When UF<sub>6</sub> is exposed to water vapor in the air, it r ...between sheets of steel armor plate. For instance, some late-production [[M1 Abrams|M1A1HA and M1A2 Abrams]] tanks built after 1998 have DU reinforcemen80 KB (11,721 words) - 10:13, 20 September 2010