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SITCSection 2
U.S. imports of gypsum and anhydrite (SITC 27323) totaled $8.7M in July 2026, traded with 15 countries.
Importers of Gypsum and Anhydrite paid $254K in duties in July 2026 — an effective duty rate of 9.6% on $2.6M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 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.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
23 shipments/mo
Basic heading 68 of 239 in section 2
Basic heading 27323 · $8.7M of $3.8B
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.
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Imports · July 2026
origin
Canada and Mexico together supply 70% of it.
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
$8.7MYoY · Pro
Exports
$1.2MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.