HS Code for Limestone powder

Limestone powder is classified under HS code 2836.50 when it consists of chemically defined calcium carbonate. While natural limestone is a mineral product typically found in Chapter 25, the process of refining it into a high-purity powder or the production of precipitated calcium carbonate (PCC) shifts the classification to Chapter 28. Chapter 28 covers inorganic chemicals and precious metal compounds. Heading 2836 specifically includes carbonates and peroxocarbonates. The classification under 2836.50 is reserved for calcium carbonate that is either chemically synthesized or refined to a degree that it is no longer considered a raw mineral. This distinction is crucial for industrial applications in the pharmaceutical, paper, and plastic industries where specific chemical purity levels are required.

Products Included

• Precipitated calcium carbonate (PCC)
• Purified limestone powder for pharmaceutical use
• Chemically pure calcium carbonate (CaCO3)
• Ground calcium carbonate (GCC) meeting Chapter 28 purity standards
• Surface-treated calcium carbonate powder

Common Misclassification

The most frequent misclassification occurs with HS code 2521.00, which covers limestone flux and limestone used for the manufacture of lime or cement. If the limestone is merely crushed or ground without chemical purification, it remains in Chapter 25. Additionally, 2517.10 is often used for crushed limestone used as aggregate. Another confusion arises with 2522.10 (Quicklime) or 2522.20 (Slaked lime), which are products of the calcination of limestone. It is essential to determine if the product is a natural mineral (Chapter 25) or a chemically defined compound (Chapter 28).

FAQ

What is the HS code for limestone powder?

Limestone powder that is chemically defined as calcium carbonate is classified under HS code 2836.50.

When should I use Chapter 25 instead of Chapter 28?

Use Chapter 25 (specifically 2521.00) if the limestone is a raw mineral product that has only been crushed or ground and has not undergone chemical purification or precipitation.