HS Code for Limestone for Cement
The HS Code for limestone for cement is 252100. The MFN duty rate for importing to the US is Free.
| HS Code (6-digit) | 252100 |
|---|---|
| US Duty Rate (MFN) | Free |
| EU Duty Rate (MFN) | 0% |
| Chapter | 25 |
| Heading | 2521 |
| Last Updated | 2026-05 |
Description
Limestone flux; limestone and other calcareous stone for manufacture of lime or cement
This HTS code covers limestone flux and other calcareous stone used in the manufacture of lime or cement, and it enters the United States duty-free.
Frequently Asked Questions
How does the calcium carbonate (CaCO3) content of limestone affect its classification and duty rate under HTS 2521.00?
Limestone classified under HTS 2521.00 must contain a high percentage of calcium carbonate to be suitable for cement or lime manufacture. The tariff schedule and specific country tariffs may differentiate between 'fluxing limestone' and other calcareous stone based on precise chemical composition, which can impact the applicable duty rate. Importers should be prepared to provide a laboratory analysis or mill certificate to substantiate the product's classification.
What are the specific customs inspection risks for importing limestone for cement under HTS 2521.00?
The primary risk is misclassification due to the product's intended use and chemical composition. Customs may inspect to verify that the limestone qualifies as 'flux' or is for cement/lime manufacture, as opposed to decorative or dimension stone under different headings. Shipments may also face scrutiny to ensure they are not contaminated with soil or other materials, which could affect duty treatment or trigger agricultural quarantines.
What additional costs should I expect when importing limestone for cement (HTS 252100) into the United States?
Beyond the standard 1.4% Most Favored Nation (MFN) duty rate, imports of this commodity are subject to a Harbor Maintenance Fee (HMF) of 0.125% of the cargo value and a Merchandise Processing Fee (MPF), typically 0.3464% of the entered value (minimum $27.23, maximum $575.70). For bulk limestone shipments, you must also budget for potential additional terminal handling charges (THCs) at the port of discharge, which are often based on weight or volume.
Limestone: Chemical Composition & Classification
The classification under 2521.00 for cement manufacturing is specifically for limestone flux and calcareous stone. For classification here, the calcium carbonate (CaCO3) content is the key determinant, typically needing a very high purity, often above 75-80%. Stone with a lower CaCO3 content or a high proportion of clay/silica may be excluded, as it is unsuitable for cement flux and could be classified elsewhere, such as under 2515 for marble or 2517 for ordinary building stone. The intended industrial use for Portland cement production is a critical factor alongside the chemical analysis.
Related & Confusing Classifications
Limestone for cement is classified under 2521.00, but other calcareous building stones are separately classified. Marble, travertine, and other monumental/building stone (even if calcareous) fall under heading 2515. Chalk, a softer form of limestone, has its own heading 2509. Crucially, quicklime, slaked lime, and hydraulic lime, which are products derived from burning limestone, are classified in a different chapter entirely under heading 2522. Always verify the product's primary use and physical state to avoid misclassification.
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