Magnesium oxide
Magnesium oxide, whether or not pure
HSN 2519 90 40 (Magnesium oxide) 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 products within Chapter 25 heading 2519 — including fused magnesia and dead-burned (sintered) magnesia — are classified under separate tariff lines that may carry distinct compliance considerations.
The absence of compliance at this tariff line does not extend to neighbouring lines within heading 2519: fused magnesia and dead-burned (sintered) magnesia are separately classified and may attract their own requirements. Magnesium oxide used as a refractory material or as an industrial chemical input can trigger re-examination of classification on the basis of intended use or processing state. Re-classification by customs to a more specific tariff line — or to a heading in Chapter 28 (inorganic chemicals) for chemically pure grades — triggers retrospective compliance and detention pending resolution.