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SITCSection 2
U.S. imports of gypsum and anhydrite (SITC 27323) totaled $8.9M in April 2026, traded with 12 countries.
Importers of Gypsum and Anhydrite paid $241K in duties in April 2026 — an effective duty rate of 8.2% on $2.9M in dutiable value, based on actual customs collections rather than the published tariff schedule. Gypsum and Anhydrite imports of $8.9M in April 2026 ran 15% above the year-to-date monthly average of $7.7M.
Last updated: April 2026 dataGypsum (calcium sulfate dihydrate) and anhydrite (the anhydrous form) are widely traded industrial minerals serving the wallboard, cement retarder, and agricultural soil amendment markets. The two minerals are chemically related but commercially distinct: gypsum is the dominant form in wallboard manufacturing, while anhydrite finds use as a cement additive and specialty filler. Calcined gypsum (plaster of Paris) is classified separately, so the boundary between raw gypsum and processed plaster products is a recurring classification issue for importers. Bulk gypsum is a high-volume, low-value commodity where freight economics and port proximity to wallboard plants strongly influence sourcing decisions.
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Raw gypsum retains its chemically bound water (dihydrate form) and is classified here, while calcined gypsum — which has been heated to drive off water and convert it to hemihydrate or anhydrite — is classified under headings covering plasters and building materials. Importers should obtain a certificate of analysis confirming the hydration state and calcination temperature history to support the correct classification.
Yes. Gypsum used as a soil amendment — sometimes marketed as 'land plaster' — remains classifiable here provided it has not been chemically treated or formulated into a fertilizer product. If it is mixed with other fertilizer components or chemically treated, it may shift to a fertilizer heading. The physical and chemical state of the material at the time of import governs the classification.
Monthly import values over time
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