1507.90.40 | 20 | Once-refined (subjected to alkali or caustic wash, but not bleached or deodorized) | kg | | | |
2805 | | Alkali or alkaline-earth metals; rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed; mercury: | | | | |
2805.11.00 | 00 | Alkali or alkaline-earth metals: | | | | |
2839 | | Silicates; commercial alkali metal silicates: | | | | |