2805301010
- Alkali or alkaline-earth metals; rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed; mercury
- Rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed
- Intermixtures or interalloys
- Alloy of cerium with other rare-earth metals, containing by weight 47 % or more of cerium