Sulfates, Not Elsewhere Specified or Included

Covering a chemically diverse group of metal sulfates not classified under dedicated headings, this HS6 heading encompasses cobalt sulfate (2833291000), iron sulfate (2833292000), vanadium sulfate (2833293000), chromium sulfate (2833294000), zinc sulfate (2833294500), manganese sulfate (2833295110), and several residual lines. Cobalt and vanadium sulfates are of particular strategic interest as battery and specialty-alloy inputs, while zinc and iron sulfates serve agricultural and water-treatment markets. Mexico leads US import supply, with China and India also prominent sources; Chinese-origin goods across several of these lines may carry Section 301 tariff exposure. Correct classification among the eight 10-digit lines is essential, as duty treatment and trade-remedy applicability can differ by specific compound.