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Chapter 25

Salt; Sulfur; Earths and Stone; Plastering Materials, Lime and Cement

144 tariff lines · 101 filing-ready 10-digit codes · codes begin with 25

Chapter 25 of the US Harmonized Tariff Schedule covers salt; Sulfur; Earths and Stone; Plastering Materials, Lime and Cement. Every code in this chapter starts with the digits 25. Work down the nested list below: the bold headings are broad categories, and the 10-digit statistical codes underneath them are what you actually declare to US Customs. Duty rates shown are the general (Column 1) rates that apply to most trading partners.

Codes in Chapter 25

2501.00.00.00Salt (including table salt and denatured salt) and pure sodium chloride, whether or not in aqueous solution or containing added anti-caking or free-flowing agents; sea water
HTS codeDescriptionLevelGeneral duty rate
2502.00.00.00Unroasted iron pyrites
HTS codeDescriptionLevelGeneral duty rate
2503.00.00Sulfur of all kinds, other than sublimed sulfur, precipitated sulfur and colloidal sulfur
HTS codeDescriptionLevelGeneral duty rate
2503.00.00.10Crude or unrefined sulfur10-digit statistical code
2503.00.00.90Other10-digit statistical code
2504Natural graphite
HTS codeDescriptionLevelGeneral duty rate
2504.10In powder or in flakes6-digit heading
2504.10.10.00Crystalline flake (not including flake dust)10-digit statistical codeFree
2504.10.50.00Other10-digit statistical codeFree
2504.90.00.00Other10-digit statistical codeFree
2505Natural sands of all kinds, whether or not colored, other than metalbearing sands of chapter 26
HTS codeDescriptionLevelGeneral duty rate
2505.10Silica sands and quartz sands6-digit heading
2505.10.10.00Sand containing by weight 95 percent or more of silica and not more than 0.6 percent of oxide of iron10-digit statistical codeFree
2505.10.50.00Other10-digit statistical codeFree
2505.90.00.00Other10-digit statistical codeFree
2506Quartz (other than natural sands); quartzite, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape
HTS codeDescriptionLevelGeneral duty rate
2506.10.00Quartz8-digit subheadingFree
2506.10.00.10Sands (other than natural) containing by weight 95 percent or more of silica and not more than 0.6 percent of oxide of iron10-digit statistical code
2506.10.00.50Other10-digit statistical code
2506.20.00Quartzite8-digit subheadingFree
2506.20.00.10Crude or roughly trimmed10-digit statistical code
2506.20.00.80Other10-digit statistical code
2507.00.00.00Kaolin and other kaolinic clays, whether or not calcined
HTS codeDescriptionLevelGeneral duty rate
2508Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths
HTS codeDescriptionLevelGeneral duty rate
2508.10.00.00Bentonite10-digit statistical codeFree
2508.30.00.00Fire-clay10-digit statistical codeFree
2508.40.01Other clays8-digit subheadingFree
2508.40.01.10Common blue clay and other ball clays10-digit statistical code
2508.40.01.20Decolorizing earths and fuller's earth10-digit statistical code
2508.40.01.50Other10-digit statistical code
2508.50.00.00Andalusite, kyanite and sillimanite10-digit statistical codeFree
2508.60.00.00Mullite10-digit statistical codeFree
2508.70.00.00Chamotte or dinas earth10-digit statistical codeFree
2509.00Chalk
HTS codeDescriptionLevelGeneral duty rate
2509.00.10.00Crude10-digit statistical codeFree
2509.00.20.00Other10-digit statistical codeFree
2510Natural calcium phosphates, natural aluminum calcium phosphates and phosphatic chalk
HTS codeDescriptionLevelGeneral duty rate
2510.10.00.00Unground10-digit statistical codeFree
2510.20.00.00Ground10-digit statistical codeFree
2511Natural barium sulfate (barytes); natural barium carbonate (witherite), whether or not calcined, other than barium oxide of heading 2816
HTS codeDescriptionLevelGeneral duty rate
2511.10Natural barium sulfate (barytes)6-digit heading
2511.10.10.00Ground10-digit statistical codeFree
2511.10.50.00Other10-digit statistical code$1.25/t
2511.20.00.00Natural barium carbonate (witherite)10-digit statistical codeFree
2512.00.00.00Siliceous fossil meals (for example, kieselguhr, tripolite and diatomite) and similar siliceous earths, whether or not calcined, of an apparent specific gravity of 1 or less
HTS codeDescriptionLevelGeneral duty rate
2513Pumice; emery; natural corundum, natural garnet and other natural abrasives, whether or not heat-treated
HTS codeDescriptionLevelGeneral duty rate
2513.10.00Pumice stone8-digit subheadingFree
2513.10.00.10Crude or in irregular pieces, including crushed pumice10-digit statistical code
2513.10.00.80Other10-digit statistical code
2513.20Emery, natural corundum, natural garnet and other natural abrasives6-digit heading
2513.20.10.00Crude or in irregular pieces10-digit statistical codeFree
2513.20.90.00Other10-digit statistical codeFree
2514.00.00.00Slate, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape
HTS codeDescriptionLevelGeneral duty rate
2515Marble, travertine and other calcareous monumental or building stone of an apparent specific gravity of 2.5 or more, and alabaster, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape
HTS codeDescriptionLevelGeneral duty rate
2515.11.00.00Crude or roughly trimmed10-digit statistical codeFree
2515.12Merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape6-digit heading
2515.12.10.00Marble10-digit statistical codeFree
2515.12.20.00Travertine10-digit statistical code3%
2515.20.00.00Other calcareous monumental or building stone; alabaster10-digit statistical code3%
2516Granite, porphyry, basalt, sandstone and other monumental or building stone, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape
HTS codeDescriptionLevelGeneral duty rate
2516.11.00.00Crude or roughly trimmed10-digit statistical codeFree
2516.12.00Merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape8-digit subheading2.8%
2516.12.00.30Having a thickness of 7.5 cm or more10-digit statistical code
2516.12.00.60Other10-digit statistical code
2516.20Sandstone6-digit heading
2516.20.10.00Crude or roughly trimmed10-digit statistical codeFree
2516.20.20.00Merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape10-digit statistical code3%
2516.90.00Other monumental or building stone8-digit subheading3%
2516.90.00.30Having a thickness of 7.5 cm or more10-digit statistical code
2516.90.00.60Other10-digit statistical code
2517Pebbles, gravel, broken or crushed stone, of a kind commonly used for concrete aggregates, for road metalling, or for railway or other ballast; shingle and flint, whether or not heat-treated; macadam of slag, dross or similar industrial waste, whether or not incorporating the materials cited in the first part of the heading; tarred macadam; granules, chippings and powder, of stones of heading 2515 or 2516, whether or not heat-treated
HTS codeDescriptionLevelGeneral duty rate
2517.10.00Pebbles, gravel, broken or crushed stone, of a kind commonly used for concrete aggregates, for road metalling, or for railway or other ballast, shingle and flint, whether or not heat-treated8-digit subheadingFree
2517.10.00.15Pebbles and gravel10-digit statistical code
2517.10.00.20Limestone, except pebbles and gravel10-digit statistical code
2517.10.00.55Other10-digit statistical code
2517.20.00.00Macadam of slag, dross or similar industrial waste, whether or not incorporating the materials cited in subheading 2517.1010-digit statistical codeFree
2517.30.00.00Tarred macadam10-digit statistical codeFree
2517.41.00.00Of marble10-digit statistical codeFree
2517.49.00.00Other10-digit statistical codeFree
2518Dolomite, whether or not calcined or sintered, including dolomite roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape
HTS codeDescriptionLevelGeneral duty rate
2518.10.00.00Dolomite, not calcined or sintered10-digit statistical codeFree
2518.20.00.00Calcined or sintered dolomite10-digit statistical code3%
2519Natural magnesium carbonate (magnesite); fused magnesia; dead-burned (sintered) magnesia, whether or not containing small quantities of other oxides added before sintering; other magnesium oxide, whether or not pure
HTS codeDescriptionLevelGeneral duty rate
2519.10.00.00Natural magnesium carbonate (magnesite)10-digit statistical codeFree
2519.90Other6-digit heading
2519.90.10.00Fused magnesia and dead-burned (sintered) magnesia10-digit statistical codeFree
2519.90.20.00Caustic calcined magnesite10-digit statistical codeFree
2519.90.50.00Other10-digit statistical codeFree
2520Gypsum; anhydrite; plasters (consisting of calcined gypsum or calcium sulfate) whether or not colored, with or without small quantities of accelerators or retarders
HTS codeDescriptionLevelGeneral duty rate
2520.10.00.00Gypsum; anhydrite10-digit statistical codeFree
2520.20.00.00Plasters10-digit statistical codeFree
2521.00.00.00Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement
HTS codeDescriptionLevelGeneral duty rate
2522Quicklime, slaked lime and hydraulic lime, other than calcium oxide and hydroxide of heading 2825
HTS codeDescriptionLevelGeneral duty rate
2522.10.00.00Quicklime10-digit statistical codeFree
2522.20.00.00Slaked lime10-digit statistical codeFree
2522.30.00.00Hydraulic lime10-digit statistical codeFree
2523Portland cement, aluminous cement, slag cement, supersulfate cement and similar hydraulic cements, whether or not colored or in the form of clinkers
HTS codeDescriptionLevelGeneral duty rate
2523.10.00.00Cement clinkers10-digit statistical codeFree
2523.21.00.00White cement, whether or not artificially colored10-digit statistical codeFree
2523.29.00.00Other10-digit statistical codeFree
2523.30.00.00Aluminous cement10-digit statistical codeFree
2523.90.00.00Other hydraulic cements10-digit statistical codeFree
2524Asbestos
HTS codeDescriptionLevelGeneral duty rate
2524.10.00.00Crocidolite (Blue)10-digit statistical codeFree
2524.90.00Other8-digit subheadingFree
2524.90.00.10Amosite10-digit statistical code
2524.90.00.30Crudes10-digit statistical code
2524.90.00.40Milled fibers, group 3 grades (spinning fibers or equivalent)10-digit statistical code
2524.90.00.45Milled fibers, group 4 and 5 grades10-digit statistical code
2524.90.00.55Other10-digit statistical code
2524.90.00.60Other10-digit statistical code
2525Mica, including splittings; mica waste
HTS codeDescriptionLevelGeneral duty rate
2525.10.00Crude mica and mica rifted into sheets or splittings8-digit subheadingFree
2525.10.00.10Split block mica10-digit statistical code
2525.10.00.20Mica splittings10-digit statistical code
2525.10.00.50Other10-digit statistical code
2525.20.00.00Mica powder10-digit statistical codeFree
2525.30.00.00Mica waste10-digit statistical codeFree
2526Natural steatite, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape; talc
HTS codeDescriptionLevelGeneral duty rate
2526.10.00.00Not crushed, not powdered10-digit statistical codeFree
2526.20.00.00Crushed or powdered10-digit statistical codeFree
2528.00.00Natural borates and concentrates thereof (whether or not calcined), but not including borates separated from natural brine; natural boric acid containing not more than 85 percent of H3BO3 calculated on the dry weight
HTS codeDescriptionLevelGeneral duty rate
2528.00.00.05Natural sodium borates and concentrates thereof (whether or not calcined)10-digit statistical code
2528.00.00.10Natural calcium borates10-digit statistical code
2528.00.00.50Other10-digit statistical code
2529Feldspar; leucite, nepheline and nepheline syenite; fluorspar
HTS codeDescriptionLevelGeneral duty rate
2529.10.00.00Feldspar10-digit statistical codeFree
2529.21.00.00Containing by weight 97 percent or less of calcium fluoride10-digit statistical codeFree
2529.22.00.00Containing by weight more than 97 percent of calcium fluoride10-digit statistical codeFree
2529.30.00Leucite; nepheline and nepheline syenite8-digit subheadingFree
2529.30.00.10Nepheline syenite10-digit statistical code
2529.30.00.50Other10-digit statistical code
2530Mineral substances not elsewhere specified or included
HTS codeDescriptionLevelGeneral duty rate
2530.10.00.00Vermiculite, perlite and chlorites, unexpanded10-digit statistical codeFree
2530.20Kieserite, epsom salts (natural magnesium sulfates)6-digit heading
2530.20.10.00Kieserite10-digit statistical codeFree
2530.20.20.00Epsom salts10-digit statistical codeFree
2530.90Other6-digit heading
2530.90.10.00Natural cryolite; natural chiolite10-digit statistical codeFree
2530.90.20.00Natural micaceous iron oxides10-digit statistical code2.9%
2530.90.80Other8-digit subheadingFree
2530.90.80.10Celestite10-digit statistical code
2530.90.80.15Earth colors10-digit statistical code
2530.90.80.50Other10-digit statistical code

Not sure which line applies?

Classification follows the General Rules of Interpretation: the most specific description wins, and you must use a 10-digit statistical code on the entry. When two lines look equally plausible, a CBP binding ruling is the only way to be certain.

How HTS codes are structuredEstimate duty

Source: USITC Harmonized Tariff Schedule, 2026 Basic Edition, Revision 16. Rate text is reproduced verbatim from the official export; category paths and duty estimates are derived.

Data loaded August 18, 2026.Check this chapter on hts.usitc.govReport an errorHow this data is built