HS Code for Sintered dolomite
Sintered dolomite is classified under HS code 2518.20, which specifically addresses dolomite that has undergone a calcination or sintering process. This classification falls within Chapter 25, covering salt, sulfur, earths, and stone. The process of sintering involves heating raw dolomite—a natural calcium magnesium carbonate—to extremely high temperatures, typically exceeding 1,500 degrees Celsius. This thermal treatment, often referred to as "dead-burning," drives off carbon dioxide and results in a dense, chemically stable refractory material composed primarily of calcium and magnesium oxides. Under GRI 1, the classification is dictated by the specific description in heading 25.18. While raw dolomite is classified under 2518.10, the sintered variety is distinguished by its physical transformation into a hard, granular material that is resistant to hydration and thermal shock. This makes it ideal for use as a refractory lining in steel-making furnaces, particularly in basic oxygen furnaces and electric arc furnaces. The material must remain in a granular or roughly blocked state to stay within this heading; if it is further processed into finished refractory bricks, it would move to Chapter 69.
Products Included
- Dead-burned dolomite
- Calcined dolomite
- Refractory grade sintered dolomite
- Sintered dolomite grains
- Sintered dolomite blocks (roughly trimmed or sawn)
Common Misclassification
Sintered dolomite is often confused with 2518.10 (raw dolomite) or 2522.20 (slaked lime). The primary difference is the heat treatment; 2518.10 has not been sintered, and 2522.20 refers to calcium hydroxide. It is also sometimes misclassified under 3816.00, which covers refractory cements and mortars, but 2518.20 is reserved for the mineral itself before it is mixed into a prepared cement.
FAQ
What is the HS code for sintered dolomite?
The HS code for sintered or calcined dolomite is 2518.20.
Is sintered dolomite the same as refractory brick?
No, sintered dolomite is the raw material used to make refractory linings. Once it is shaped and fired into bricks, it is classified under HS code 6902.10.
Industry
Frequently Asked Questions
What is the HS code for Sintered dolomite?
The HS code for Sintered dolomite is 251820 (Dolomite, calcined or sintered; including dolomite roughly trimmed, or merely cut by sawing or otherwise into blocks or slabs of rectangular (including square) shape).
How do I classify Sintered dolomite for customs?
Sintered dolomite is classified under HS code 251820 — Dolomite, calcined or sintered; including dolomite roughly trimmed, or merely cut by sawing or otherwise into blocks or slabs of rectangular (including square) shape. This is a 6-digit subheading level code.
Is the HS code for Sintered dolomite the same in all countries?
The base HS code 251820 for Sintered dolomite is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.