Flue Gas Desulfurization Gypsum
Synthetic gypsum from power plant emissions scrubbing, chemically identical to natural gypsum. HTS 2520.10.00.00 covers this high-purity dihydrate form for wallboard and agriculture. Increasingly replaces mined gypsum.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If unpurified residues
Impure FGD sludge remains industrial residue rather than separated gypsum.
If refined chemical grade
Ultra-pure FGD gypsum for chemicals becomes sulfate salts.
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Import Tips & Compliance
• Stack gas process certificates confirming gypsum purity >93%
• Radioactivity testing standard for FGD materials from coal plants
• Environmental compliance docs for byproduct status
Related Products under HTS 2520.10.00.00
Natural Gypsum Rock
Raw gypsum ore extracted from natural deposits, primarily calcium sulfate dihydrate in crystalline form. It falls under HTS 2520.10.00.00 as unprocessed gypsum, distinct from calcined plasters or anhydrite. Used as the base material for plasterboard and cement production.
Gypsum Lumps
Crushed gypsum in irregular lump form, minimally processed after mining but not ground or calcined. Classified under HTS 2520.10.00.00 as crude gypsum suitable for grinding into powder or direct use in agriculture. Ideal for soil amendment due to its sulfur content.
Anhydrite Mineral
Natural anhydrite (calcium sulfate without water of crystallization) mined as a rock or powder. Directly covered by HTS 2520.10.00.00 alongside gypsum, used in cement production and as a drying agent. Distinguished from gypsum by lower water content.
Raw Gypsum Powder
Gypsum ore ground into fine powder without calcination or additives. HTS 2520.10.00.00 applies to this unprocessed form used in plaster production, animal feed, and water treatment. Not to be confused with finished plasters.
Agricultural Gypsum Pellets
Pelletized natural gypsum for soil pH adjustment and sulfur supplementation. Remains under HTS 2520.10.00.00 as uncalcined gypsum, valued in farming for improving clay soils. Pelleting is mechanical, not chemical processing.
Construction Grade Gypsum
High-purity gypsum lumps selected for wallboard manufacturing. HTS 2520.10.00.00 covers this crude form before calcining into stucco. Essential raw material for drywall production.