Siliceous fossil meals (e.g. kieselguhr, tripolite and diatomite) and similar siliceous earths; whether or not calcined, of an apparent specific gravity of 1 or less
2512.00.00.00
THN
General Duty: Free
Siliceous fossil meals and similar siliceous earths, whether or not calcined, of an apparent specific gravity of 1 or less