Ammonium Wolframate Crystals from Mexico
Ammonium wolframate crystals are metatungstate form used in photographic chemicals and corrosion inhibitors. As a defined inorganic salt of tungsten, it precisely fits HTS 2841.80.0010 under ammonium tungstates.
Duty Rate — Mexico → United States
5.5%
Rate breakdown
9903.05.860%Universal product exemption (U.S. note 52(b))
Import Tips
• Use HDX or XRPD analysis documentation to prove crystalline tungstate structure
• Comply with EPA TSCA inventory listing for new chemical import notifications
• Watch for reclassification if dissolved—solutions may fall under different preparations