What it is
Nodules made by burning limestone and clay in a kiln; ground with gypsum (and fly ash or slag) to make cement in grinding units.
OPC clinker (IS 16353)White cement clinkerLow-alkali clinker
Where imports come from
Low; India's cement output was about 426.29 million tonnes in 2023-24 from around 217 large plants.
Rules before you buy or sell
- IS 16353 (Portland cement clinker) is on BIS's product-certification list; cement itself carries a compulsory BIS mark.
- Check the current import and export policy for your exact 8-digit HS code in the DGFT ITC(HS) schedules.
Storage and handling
Store in covered sheds or silos; rain hydrates clinker and lowers cement strength.