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Antimony is a chemical element with symbol Sb and atomic number 51. A lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite (Sb2S3).
A 7705 (OTTOKEMI) Antimony sputtering target, diam. × thickness 2 inch × 0.125 inch, 99.999%, with bonded Copper (Cu) backing plate of thickness 3mm Cas 7440-36-0 - used as an alloy hardener as well as in metallurgical applications.