HSN code 2521: Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement.

HSN heading 2521 sits in chapter 25 (Salt; sulphur; earths and stone; plastering materials, lime and cement). It has 2 8-digit tariff items. On a tax invoice, businesses with turnover up to ₹5 crore show at least the 4-digit code 2521; above ₹5 crore, the 6-digit sub-heading.

⚠️About GST rates: GST rates on many goods changed from 22 September 2025, when most items moved to the 5% and 18% slabs and a few to 40%. This finder lists codes and descriptions only — confirm the rate for your item in the current CBIC rate notification before you invoice.

8-digit tariff items under 2521

HSN code	Description
25210010	Limestone Flux; Limestone And Other Calcareous Stones, Of A Kind Used For The Manufacture Of Lime Or Cement: Limestone Flux (L.D., Below 1%…
25210090	Limestone Flux; Limestone And Other Calcareous Stones, Of A Kind Used For The Manufacture Of Lime Or Cement: Other

GST billing that fills the HSN in for you

SagacityBooks keeps the HSN/SAC on every item, checks each invoice as you type, and files your returns from the same books. Start free — no card.

Start free