Siliceous fossil meals (for example, kieselguhr, tripolite and diatomite) and similar siliceous earths, whether or not calcined, of an apparent specific gravity of 1 or less
Restriction on entry into free circulation
condition:B,certificate:9009,action:29|condition:B,certificate:9010,action:29|condition:B,certificate:9017,action:26|condition:B,action:09