HTS Chapter 25 · Section V
Salt; sulphur; earths and stone; plastering materials, lime and cement
Chapter 25 averages a 0.3% general (MFN) duty across its 79 rated tariff lines, with the steepest line reaching 3%.
- 0.3%
- avg MFN duty
- 3%
- highest line
- 79
- rated tariff lines
- 91%
- enter duty-free
Tariff lines in Chapter 25 by duty-rate band
How the 79 rated lines in this chapter distribute across general (MFN) rate ranges
About HTS Chapter 25
HTS Chapter 25 - Salt; sulphur; earths and stone; plastering materials, lime and cement - organizes 150 tariff classifications in the US Harmonized Tariff Schedule. Of these, 79 carry explicit duty rates at the tariff-line level, meaning importers can look up a specific Column 1 General (MFN) rate for every qualifying shipment. Chapter 25 sits within Section V (Mineral Products), which groups commercially related product categories together.
The average general duty rate across all tariff lines in this chapter is 0.3%, with the highest individual rate reaching 3%. Duty burden varies widely across tariff lines within this chapter, classification precision matters. Below, each line links to its individual detail page showing General, Special (FTA), and Column 2 rates.
Use this chapter page as the entry point for classifying any product that falls under salt; sulphur; earths and stone; plastering materials, lime and cement. The tree below preserves the HTS indentation hierarchy (heading → subheading → tariff line), so you can narrow from broad category to specific 8-10 digit code. All data comes from the US International Trade Commission (USITC) HTS 2026 Basic Edition, the official schedule of import duties used by US Customs and Border Protection.
Chapter 25 At a Glance
| Metric | Value | Notes |
|---|---|---|
| Total tariff classifications | 150 | All headings, subheadings, and tariff lines. |
| Lines with explicit rates | 79 | Tariff lines carrying a Column 1 General duty. |
| Average general rate | 0.3% | Mean MFN rate across rated lines. |
| Highest line rate | 3% | Peak Column 1 General rate within the chapter. |
Source: USITC Harmonized Tariff Schedule 2026 Basic Edition. Computed at last data refresh, see methodology.
Tariff Lines
2501.00.00.00 Salt (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
t Free
2502.00.00.00 Unroasted iron pyrites
t Free
2503.00.00 Sulfur of all kinds, other than sublimed sulfur, precipitated sulfur and colloidal sulfur
Free
2503.00.00.10 Crude or unrefined sulfur
t 2503.00.00.90 Other
t 2504 Natural graphite:
2504.10 In powder or in flakes:
2504.10.10.00 Crystalline flake (not including flake dust)
kg Free
2504.10.50.00 Other
kg Free
2504.90.00.00 Other
kg Free
2505 Natural sands of all kinds, whether or not colored, other than metalbearing sands of chapter 26:
2505.10 Silica sands and quartz sands:
2505.10.10.00 Sand containing by weight 95 percent or more of silica and not more than 0.6 percent of oxide of iron
t Free
2505.10.50.00 Other
t Free
2505.90.00.00 Other
t Free
2506 Quartz (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:
2506.10.00 Quartz
Free
2506.10.00.10 Sands (other than natural) containing by weight 95 percent or more of silica and not more than 0.6 percent of oxide of iron
t 2506.10.00.50 Other
t 2506.20.00 Quartzite
Free
2506.20.00.10 Crude or roughly trimmed
t 2506.20.00.80 Other
t 2507.00.00.00 Kaolin and other kaolinic clays, whether or not calcined
t Free
2508 Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths:
2508.10.00.00 Bentonite
t Free
2508.30.00.00 Fire-clay
t Free
2508.40.01 Other clays
Free
2508.40.01.10 Common blue clay and other ball clays
t 2508.40.01.20 Decolorizing earths and fuller's earth
t 2508.40.01.50 Other
t 2508.50.00.00 Andalusite, kyanite and sillimanite
t Free
2508.60.00.00 Mullite
t Free
2508.70.00.00 Chamotte or dinas earth
t Free
2509.00 Chalk:
2509.00.10.00 Crude
t Free
2509.00.20.00 Other
t Free
2510 Natural calcium phosphates, natural aluminum calcium phosphates and phosphatic chalk:
2510.10.00.00 Unground
t Free
2510.20.00.00 Ground
t Free
2511 Natural barium sulfate (barytes); natural barium carbonate (witherite), whether or not calcined, other than barium oxide of heading 2816:
2511.10 Natural barium sulfate (barytes):
2511.10.10.00 Ground
t Free
2511.10.50.00 Other
t $1.25/t
2511.20.00.00 Natural barium carbonate (witherite)
kg Free
2512.00.00.00 Siliceous 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
t Free
2513 Pumice; emery; natural corundum, natural garnet and other natural abrasives, whether or not heat-treated:
2513.10.00 Pumice stone
Free
2513.10.00.10 Crude or in irregular pieces, including crushed pumice
kg 2513.10.00.80 Other
kg 2513.20 Emery, natural corundum, natural garnet and other natural abrasives:
2513.20.10.00 Crude or in irregular pieces
kg Free
2513.20.90.00 Other
kg Free
2514.00.00.00 Slate, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape
t Free
2515 Marble, 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:
Marble and travertine:
2515.11.00.00 Crude or roughly trimmed
m3, t Free
2515.12 Merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape:
2515.12.10.00 Marble
t Free
2515.12.20.00 Travertine
t 3%
2515.20.00.00 Other calcareous monumental or building stone; alabaster
t 3%
2516 Granite, 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:
Granite:
2516.11.00.00 Crude or roughly trimmed
m3, t Free
2516.12.00 Merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape
2.8%
2516.12.00.30 Having a thickness of 7.5 cm or more
t 2516.12.00.60 Other
t 2516.20 Sandstone:
2516.20.10.00 Crude or roughly trimmed
m3, t Free
2516.20.20.00 Merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape
t 3%
2516.90.00 Other monumental or building stone
3%
2516.90.00.30 Having a thickness of 7.5 cm or more
t 2516.90.00.60 Other
t 2517 Pebbles, 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:
2517.10.00 Pebbles, 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
Free
2517.10.00.15 Pebbles and gravel
t 2517.10.00.20 Limestone, except pebbles and gravel
t 2517.10.00.55 Other
t 2517.20.00.00 Macadam of slag, dross or similar industrial waste, whether or not incorporating the materials cited in subheading 2517.10
t Free
2517.30.00.00 Tarred macadam
t Free
Granules, chippings and powder, of stones of heading 2515 or 2516, whether or not heat-treated:
2517.41.00.00 Of marble
t Free
2517.49.00.00 Other
t Free
2518 Dolomite, 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:
2518.10.00.00 Dolomite, not calcined or sintered
t Free
2518.20.00.00 Calcined or sintered dolomite
t 3%
2519 Natural 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:
2519.10.00.00 Natural magnesium carbonate (magnesite)
t Free
2519.90 Other:
2519.90.10.00 Fused magnesia and dead-burned (sintered) magnesia
kg Free
2519.90.20.00 Caustic calcined magnesite
t Free
2519.90.50.00 Other
kg Free
2520 Gypsum; anhydrite; plasters (consisting of calcined gypsum or calcium sulfate) whether or not colored, with or without small quantities of accelerators or retarders:
2520.10.00.00 Gypsum; anhydrite
t Free
2520.20.00.00 Plasters
t Free
2521.00.00.00 Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement
t Free
2522 Quicklime, slaked lime and hydraulic lime, other than calcium oxide and hydroxide of heading 2825:
2522.10.00.00 Quicklime
kg Free
2522.20.00.00 Slaked lime
kg Free
2522.30.00.00 Hydraulic lime
kg Free
2523 Portland cement, aluminous cement, slag cement, supersulfate cement and similar hydraulic cements, whether or not colored or in the form of clinkers:
2523.10.00.00 Cement clinkers
t Free
Portland cement:
2523.21.00.00 White cement, whether or not artificially colored
t Free
2523.29.00.00 Other
t Free
2523.30.00.00 Aluminous cement
t Free
2523.90.00.00 Other hydraulic cements
t Free
2524 Asbestos:
2524.10.00.00 Crocidolite (Blue)
t Free
2524.90.00 Other
Free
2524.90.00.10 Amosite
t Chrysotile:
2524.90.00.30 Crudes
t 2524.90.00.40 Milled fibers, group 3 grades (spinning fibers or equivalent)
t 2524.90.00.45 Milled fibers, group 4 and 5 grades
t 2524.90.00.55 Other
t 2524.90.00.60 Other
t 2525 Mica, including splittings; mica waste:
2525.10.00 Crude mica and mica rifted into sheets or splittings
Free
2525.10.00.10 Split block mica
kg 2525.10.00.20 Mica splittings
kg 2525.10.00.50 Other
kg 2525.20.00.00 Mica powder
kg Free
2525.30.00.00 Mica waste
kg Free
2526 Natural steatite, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape; talc:
2526.10.00.00 Not crushed, not powdered
kg Free
2526.20.00.00 Crushed or powdered
t Free
2528.00.00 Natural 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
Free
2528.00.00.05 Natural sodium borates and concentrates thereof (whether or not calcined)
kg 2528.00.00.10 Natural calcium borates
kg 2528.00.00.50 Other
kg 2529 Feldspar; leucite, nepheline and nepheline syenite; fluorspar:
2529.10.00.00 Feldspar
t Free
Fluorspar:
2529.21.00.00 Containing by weight 97 percent or less of calcium fluoride
t Free
2529.22.00.00 Containing by weight more than 97 percent of calcium fluoride
t Free
2529.30.00 Leucite; nepheline and nepheline syenite
Free
2529.30.00.10 Nepheline syenite
t 2529.30.00.50 Other
t 2530 Mineral substances not elsewhere specified or included:
2530.10.00.00 Vermiculite, perlite and chlorites, unexpanded
kg Free
2530.20 Kieserite, epsom salts (natural magnesium sulfates):
2530.20.10.00 Kieserite
kg Free
2530.20.20.00 Epsom salts
kg Free
2530.90 Other:
2530.90.10.00 Natural cryolite; natural chiolite
t Free
2530.90.20.00 Natural micaceous iron oxides
kg 2.9%
2530.90.80 Other
Free
2530.90.80.10 Celestite
kg 2530.90.80.15 Earth colors
kg 2530.90.80.50 Other
kg Frequently Asked Questions
What does HTS Chapter 25 cover? ▼
HTS Chapter 25 covers Salt; sulphur; earths and stone; plastering materials, lime and cement. It contains 150 individual tariff classifications, of which 79 have specified duty rates. This chapter falls under Section V (Mineral Products).
What is the average tariff rate for Chapter 25? ▼
The average general (MFN) duty rate across all tariff lines in Chapter 25 is 0.3%. The highest individual rate in this chapter is 3%. Actual duty on a specific product depends on its precise HTS classification.
How do I find the correct HTS code for my product? ▼
Browse the tariff lines listed below organized by heading and subheading. Each item with an HTS number links to its full detail page showing general, special, and Column 2 duty rates. For complex classifications, consult a licensed customs broker or contact US Customs and Border Protection (CBP).
Are there any duty-free items in Chapter 25? ▼
Yes, many chapters contain items with a "Free" general rate, meaning no duty is assessed for imports from most-favored-nation countries. Look for items marked "Free" in the tariff lines table below. Additional preferential rates may also apply under free trade agreements.
Where does PlainTariff get its tariff data? ▼
All tariff data comes from the U.S. International Trade Commission (USITC) Harmonized Tariff Schedule (HTS) 2026 Basic Edition, the official schedule of US import duties.
Learn More About Tariffs
Next steps
Find the exact rate for your product within Chapter 25.
- Click any tariff line above to see its General, Special, and Column 2 rates. Tariff lines above
- Estimate the landed duty cost on a shipment in this chapter. Tariff calculator
- Search the full schedule by product description. Search HTS
The chapter average is an orientation only, duty is set per tariff line, and Special preferential rates may apply to qualifying origins.
Related
Sources: U.S. International Trade Commission Harmonized Tariff Schedule (2026 Basic Edition) and FAO FAOSTAT Trade: Crops and Livestock. See our methodology for how figures are computed.
Every figure on PlainTariff is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.