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99.997% trace metals basis
activated, neutral, Brockmann I
powder, ultra dry
nanopowder, <50 nm particle size (TEM)
powder, primarily α phase, ≤10 μm avg. part. size, 99.5% trace metals basis
activated, basic, Brockmann I
NIST® SRM® 742, reference point
nanopowder, 13 nm primary particle size (TEM), 99.8% trace metals basis
fused, powder, primarily α-phase, -325 mesh
activated, neutral, Brockmann Activity I
99.99% trace metals basis
2040 °C (lit.)
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13 - Non Combustible Solids
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