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Osmium (Os) Metal

One of the platinum group metals, osmium (Os), is bluish-white, lustrous, extremely hard, and brittle. It is the densest of all the elements, twice that of lead, making it very hard to fabricate. Its properties make it ideal for combining with other platinum metals to produce very hard alloys. Osmium has the platinum group’s highest melting point and lowest vapor pressure. Osmium is relatively inert in ambient conditions; however, Osmium powder or sponge is pyrophoric.
Typical Applications

Osmium’s physical and chemical properties make it difficult to work with, so there are only a few uses for Osmium, the main one being the production of hard alloys, employed in the tips of fountain pens, instrument pivots, and electrical contacts, as they can resist wear from frequent use.

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Classification

Osmium (Os) Metal TSCA (SARA Title III) Status: Listed
For further information, please call the EPA, Office of Chemical Safety and Pollution Prevention (OCSPP) at 202-564-2902
Osmium (Os) Metal CAS Number: 7440-04-2
Osmium (Os) MetalUN Number: 3089
Osmium (OS) Metal EINECS Number: 231-114-0

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