Other
Andalusite, kyanite and sillimanite, other grades
HSN 2508 50 39 (andalusite, kyanite and sillimanite — other than the specifically enumerated grades) is not covered by a Bureau of Indian Standards Quality Control Order and carries no Partner Government Agency clearance requirement at the tariff-line level. Import follows the standard customs procedure: Importer-Exporter Code (IEC), bill of entry, commercial invoice, packing list. Other minerals and refractory materials within Chapter 25 — including mullite and chamotte earths classified separately under the same heading — may carry distinct compliance depending on end-use and processing state.
The principal importer risk at this tariff line is misclassification: andalusite, kyanite, and sillimanite that have been calcined or processed into specific refractory grades may fall under a more particular subheading within Chapter 25 or, if incorporated into shaped refractory articles, migrate to Chapter 69. Customs re-classification on examination triggers retrospective compliance and potential detention pending the applicable requirement. Verify the product's processing state, calcination status, and intended use against the customs tariff before relying on the absence of compliance here.