Chromium is a chemical element with symbol Cr and atomic number 24. It is the first element in Group 6. It is a steely-grey, lustrous, hard and brittle metal which takes a high polish, resists tarnishing, and has a high melting point.
C 2681 (OTTO) Chromium pieces, 4-10 mm, 99.999% Cas 7440-47-3 - used as catalysts for processing hydrocarbons.