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ASTM B393 RO4200 Nb1 Niobium Strip 1. Information Of ASTM B393 Nb1 Niobium Strip: Name Niobium Strip Density 8.57g/cm3 Purity 99.95%,99.99% Grade RO4200 ,Nb1,Nb2 Thickness ≥ 0.01mm Width ≤ 300mm ...