HS Code 2521: Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement

Q: Is HS code 2521 the same in every country?

Yes — HS code 2521 is part of the WCO Harmonized System and is the same in every WCO member country at the 6-digit level. Beyond 6 digits, each country extends the code under its own system (e.g. HTSUS in the US, CN/TARIC in the EU, HSK in Korea, CCCHS in China) for national tariff rates and trade statistics. To see how a specific country classifies this code, select a country.

Q: Which WCO edition does HS code 2521 belong to, and has it been reclassified?

The Harmonized System is maintained by the World Customs Organization (WCO) and revised approximately every five years. The current edition is HS 2022, which replaced HS 2017 on 1 January 2022. Codes are added, merged, or split between editions to reflect new products and trade patterns, so a code valid in one edition may not exist or may mean something different in another.

Q: How do I find the correct country-specific version of HS code 2521?

Beyond the international 6-digit level, each country adds its own digits — the US extends to 10 digits (HTSUS), the EU to 8 or 10 (CN/TARIC), China to 13 (CCCHS), Korea to 10 (HSK), Japan to 9, and so on. To find the full code used by a specific country, select a country in TradeInt's HS Code Tool and search for 2521.

What is HS Code 2521

HS Code 2521 covers Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement. It is a 4-digit heading within Chapter 25 (Salt; sulphur; earths and stone; plastering materials, lime and cement), Section V. Its 6-digit subheadings are identical in every HS-adopting country; from the 7th digit onward, each country extends the code for its own tariff and statistics.

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What does HS Code 2521 Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement Cover?

Section V

Chapters (25-27) Mineral products

Chapter 25

Salt; sulphur; earths and stone; plastering materials, lime and cement

HS Code 2521

Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement

HS Code 252100

Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement

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What HS Codes for Stone, Cement and Minerals Do Not Cover

Chapter 25 covers unworked or simply prepared mineral products — salt, sulphur, earths, stone, plastering materials. Goods frequently misclassified here but that belong elsewhere include:

Sublimed, precipitated, or colloidal sulphur

heading 2802

Precious and semi-precious stones

Chapter 71

Brined or seasoned salt mixes (for food)

Chapter 21

Worked stone articles

Chapter 68

This list highlights common classification errors only — it is not exhaustive. For binding classification, work with a licensed customs broker or qualified trade compliance professional.

Related HS Codes under Limestone HS 2521

HS Code 252100

Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement

HS Code 2501

Salt (including table salt and denatured salt); pure sodium chloride whether or not in aqueous solution; sea water

HS Code 2502

Iron pyrites; unroasted

HS Code 2503

Sulphur of all kinds; other than sublimed, precipitated and colloidal sulphur

HS Code 2504

Graphite; natural

HS Code 2505

Sands of all kinds; natural, whether or not coloured, other than metal-bearing sands of chapter 26

HS Code 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

HS Code 2507

Kaolin and other kaolinic clays; whether or not calcined

HS Code 2508

Clays; (not including expanded clays of heading no. 6806), andalusite kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earth

HS Code 2509

Chalk

Frequently Asked Questions

What is HS code 2521?

HS code 2521 covers Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement, a heading within Chapter 25 (Salt; sulphur; earths and stone; plastering materials, lime and cement) of the WCO Harmonized System. Headings sit between the broad chapter level and the more specific 6-digit subheading level.

Is HS code 2521 the same in every country?

Which WCO edition does HS code 2521 belong to, and has it been reclassified?

How do I find the correct country-specific version of HS code 2521?