Copperas Crystals (Ferrous Sulfate) from Canada
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 — Canada → United States
10%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
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