U.S. imports of Gypsum and Anhydrite (SITC 27323) totaled $9.1M in August 2026, imported from 16 countries.
Importers of Gypsum and Anhydrite paid $505K in duties in August 2026, an average duty rate of 5.57% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 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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46 import shipments a month
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.
Basic heading 64 of 239 in section 2
Basic heading 27323 · $9.1M of $3.8B
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Imports · August 2026
origin
Spain and Mexico together supply 68% of it. China pays 25.0% duty; Canada 0.0%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$9.1MYoY · free account
Exports
$2.2MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $110.0M of Gypsum and Anhydrite and exported $15.4M.
Through August 2026. Source: U.S. Census Bureau.