Chapter 2520 — Customs Tariff Headings
Products classified under Tariff item 25.20
Agricultural Gypsum Pellets
Agricultural gypsum pellets made from natural, uncalcined gypsum for soil pH adjustment and sulfur supplementation. The pelleting process is mechanical and does not alter the chemical structure, keeping it within the scope of this heading.
2520.10.00Anhydrite Mineral
Natural anhydrite mineral, a calcium sulfate without water of crystallization, mined as rock or powder. It is explicitly listed in the tariff item alongside gypsum and is not subjected to calcination or other chemical processing.
2520.10.00Blue Diamond Gypsum
High-grade gypsum ore from Blue Diamond Mines, Nevada, unprocessed and shipped in bulk for wallboard manufacturing. As crude gypsum, it falls under this tariff item, which covers products in the crude state or after limited mechanical processing.
2520.10.00Calcined-Free Gypsum Aggregate
Crushed gypsum aggregate for concrete admixture, verified non-calcined and used to improve workability. The crushing process is mechanical and does not change the product's structure, so it remains classified as crude gypsum under this item.
2520.10.00Construction Grade Gypsum
High-purity gypsum lumps selected for wallboard manufacturing, in crude form before calcining. This tariff item covers gypsum in the crude state or after mechanical processing such as crushing, but not calcined products.
2520.10.00Dentstone Gypsum Rock
Specialty gypsum ore for dental stone production, selected for uniform crystals and high strength. As uncalcined gypsum, it falls under this item; calcination into alpha hemihydrate would change its classification.
2520.10.00Eco-Friendly Recycled Gypsum
Gypsum recovered from drywall waste, cleaned to natural equivalent purity and free of paper or plastics. As reprocessed crude gypsum for sustainable building, it falls under this tariff item, which covers gypsum in the crude state or after mechanical cleaning.
2520.10.00Flue Gas Desulfurization Gypsum
Synthetic gypsum from flue gas desulfurization, chemically identical to natural gypsum and used in wallboard and agriculture. The tariff item covers gypsum regardless of origin, as long as it is not calcined or chemically processed beyond washing or mechanical treatment.
2520.10.00Gypsum Lumps
Crushed gypsum in irregular lump form, minimally processed after mining but not ground or calcined. This crude form is suitable for grinding into powder or direct agricultural use, and falls under the tariff item for unprocessed gypsum.
2520.10.00Land Plaster Gypsum
Coarse-ground gypsum powder known as land plaster for agricultural soil sulfur supply. The grinding is a mechanical process that does not alter the chemical structure, so it remains classified as uncalcined gypsum under this item.
2520.10.00Natural Gypsum Rock
Raw gypsum ore extracted from natural deposits, primarily calcium sulfate dihydrate in crystalline form. It falls under this tariff item as unprocessed gypsum, distinct from calcined plasters or anhydrite, and is used as a base material for various industries.
2520.10.00Pharmaceutical Grade Gypsum
Ultra-pure natural gypsum meeting USP standards before processing, intended for medicinal plasters. As crude gypsum without calcination or chemical modification, it falls under this tariff item, which covers gypsum in its natural state.
2520.10.00Raw Gypsum Powder
Gypsum ore ground into fine powder without calcination or additives, used in plaster production, animal feed, and water treatment. The grinding process is mechanical and does not change the chemical structure, so it remains classified as uncalcined gypsum.
2520.10.00Synthetic Anhydrite Fines
Fine anhydrite powder from industrial byproducts, chemically equivalent to natural anhydrite but different in origin. As unprocessed anhydrite, it falls under this tariff item, which covers anhydrite in the crude state or after mechanical processing.
2520.10.00White Hills Gypsum Ore
Premium white gypsum ore from specific deposits like White Hills, Arizona, prized for purity and used in high-end plaster applications. As natural gypsum in its crude state, it falls squarely under this tariff item, which covers unprocessed gypsum.
2520.20.00Calcined Gypsum Plaster
Calcined gypsum plaster, commonly known as plaster of Paris, is produced by heating gypsum to drive off water, yielding a fine powder that sets when mixed with water. It falls under tariff item 2520.20.00 as a plaster consisting of calcined gypsum, with no processing beyond calcination.
2520.20.00Colored Modeling Plaster
Colored modeling plaster is calcined gypsum with added pigments, used for sculpting, casting, and crafts. The pigments are considered coloring only, and the product remains a plaster under tariff item 2520.20.00, as it is not processed beyond calcination and coloring.
2520.20.00Dental Plaster Type III
Dental plaster Type III is a high-strength calcined gypsum formulation with controlled accelerators for dental models and casts. It qualifies under tariff item 2520.20.00 as a plaster consisting of calcined gypsum, with small quantities of accelerators permitted by the item's description.
2520.20.00High-Strength Gypsum Plaster
High-strength gypsum plaster is made from specially calcined gypsum with accelerators to achieve superior compressive strength for precision tooling and patterns. It remains a plaster under tariff item 2520.20.00, as the processing is limited to calcination and the addition of small quantities of accelerators.
2520.20.00Plaster of Paris Powder
Plaster of Paris powder is the classic beta-hemihydrate calcined gypsum used for casts, molds, and sculptures. It falls directly under tariff item 2520.20.00 as a plaster consisting of calcined gypsum, with no added accelerators or retarders beyond trace amounts.
2520.20.00Setting-Type Joint Compound Base
Setting-type joint compound base is calcined gypsum plaster used as the primary ingredient in drywall finishing compounds. When imported as bulk powder before mixing with fillers and polymers, it falls under tariff item 2520.20.00 as a plaster, provided it is not yet a prepared compound.
2520.20.00White Architectural Plaster
White architectural plaster is a calcined gypsum product designed for interior wall finishing and decorative molding. It qualifies under tariff item 2520.20.00 as a plaster consisting of calcined gypsum, with minimal additives and no processing beyond calcination and coloring.