Salts of Oxometallic or Peroxometallic Acids (NESOI)

Vanadates, aluminates, ammonium perrhenate, and chromates of zinc or lead each serve distinct industrial roles — from superalloy processing and petroleum refining to pigment and catalyst manufacturing — and are classified across six separate 10-digit lines under this heading. Ammonium perrhenate (2841902000) is particularly significant as a precursor for rhenium-based superalloy components used in jet turbines. South Korea and Canada lead US import supply, with Chile, Japan, and Belgium also among the primary sources. Classification between specific named salts and the residual NESOI lines (2841905000 and 2841909000) requires careful chemical identification.