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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 3797 (OTTOKEMI) Antimony shot, 3-5 mm, 99.99%+ Cas 7440-36-0 - used as an alloy hardener as well as in metallurgical applications.