Calcium Sulfite Hemihydrate from Mexico
Calcium sulfite hemihydrate (CaSO3·0.5H2O), a white powder byproduct from flue gas desulfurization, used in construction materials. Falls under HTS 2832.20.00.00 as an 'other sulfite' chemically defined per Chapter 28 Note 1.
Duty Rate — Mexico → United States
13.1%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Document hydrate water content; anhydrous form may classify differently if proven
• Comply with CPSC standards if used in building products; labeling required
• Bulk shipments need dust suppression measures; improper handling causes customs holds