Chemical Specifications Assay 99.90% Oxygen (O) 0.10% Chromium (Cr) 0.005% Iron (Fe) 0.005% Magnesium (Mg) 0.001% Nickel (Ni) 0.002% Silicon (Si) 0.003% Tin (Sn) 0.003% Safety Information & Hazard Symbols local_mall Looking to Shop La