Copperas Crystals (Ferrous Sulfate) from Mexico
Copperas, or green vitriol, refers to large crystals of ferrous sulfate heptahydrate used in gardening and pigment production. Classified in HTS 2833.29.20.00 as other sulfates of iron, distinct from alums.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Use commercial invoices specifying 'copperas' with chemical formula for Customs
• Test for heavy metal impurities to meet environmental import standards
• Ship in HDPE drums to prevent leakage common with hydrated salts