HS Code for Limestone

HS code 2521.00 is specifically reserved for limestone flux and other calcareous stones used primarily in the manufacture of lime or cement. This classification is functional, meaning the intended industrial use of the stone dictates its placement here rather than in other parts of Chapter 25. Limestone flux is used in metallurgical processes to remove impurities, while the calcareous stone classified here serves as a raw material for the production of clinker in cement kilns. To qualify for this code, the stone must generally be in a raw or roughly broken state. If the stone is further worked, such as being crushed for use as road aggregate, it may move to heading 2517. The distinction is vital because 2521.00 covers the primary industrial feedstock for the construction and chemical industries. The chemical composition, specifically high calcium carbonate content, is a prerequisite, but the physical form and the intended industrial application are the primary drivers for classification under this specific heading. It excludes limestone used for monumental or building purposes, which is classified under 2515 or 2516 depending on its density and how it has been cut.

Products Included

• Limestone flux for steelmaking
• Calcareous stone for cement manufacture
• Raw limestone for lime production
• Roughly broken limestone for industrial use

Common Misclassification

Limestone is frequently misclassified under 2517.10 if it is crushed for use as concrete aggregate. It is also confused with 2515.11 (crude marble and travertine) or 2515.20 (other calcareous monumental stone). The key to 2521.00 is the specific industrial end-use for lime, cement, or fluxing.

FAQ

What is the HS code for limestone used in cement?

Limestone intended for the manufacture of cement is classified under HS code 2521.00.

Is crushed limestone for roads classified here?

No, limestone crushed for use as road metal or concrete aggregate is typically classified under HS code 2517.10.