Tungstates (Wolframates)

Ammonium tungstate and related wolframate salts are critical intermediates in the production of tungsten carbide tooling, catalysts, and specialty alloys — sectors where supply-chain security is a persistent concern. US imports are split across three 10-digit lines: ammonium tungstates (2841800010), non-ammonium tungstates (2841800040), and residual tungstates not elsewhere specified (2841800050). China dominates supply, with Taiwan and Germany also among the leading sources, and goods of Chinese origin are subject to Section 301 tariffs. Importers should verify tungsten content declarations carefully, as duty liability can differ by line.