What is HSN Code 2521?
HSN code 2521 is the Harmonized System of Nomenclature classification for Limestone Flux; Limestone And Other Calcareous Stones, Of A Kind Used For The Manufacture… under India's Goods and Services Tax (GST). It is a 4-digit code sitting at the heading (4-digit) level of the HSN hierarchy.
This code belongs to Chapter 25 — Salt, Sulphur, Earths And Stone, Plastering Materials, Lime And Cement, which is part of Section V: Mineral Products. Every GST-registered business supplying limestone flux; limestone and other calcareous stones, of a kind used for the manufacture… must quote HSN 2521 (or the digit-length required for its turnover) on tax invoices and in GSTR-1.