Chromium, calculated as Cr2 O3, 34-37 percent.
Cobalt, calculated as CoO, 29-34 percent.
Aluminum, calculated as AL2 O3, 29-35 percent.
Lead (as Pb), not more than 30 parts per million.
Arsenic (as As), not more than 3 parts per million.
Total oxides of aluminum, chromium, and cobalt not less than 97 percent.
Lead and arsenic shall be determined in the solution obtained by boiling 10 grams of the chromium-cobalt-aluminum oxide for 15 minutes in 50 milliliters of 0.5 N hydrochloric acid.
21 C.F.R. §73.1015