2818 Artificial corundum, whether or not it has a chemical definition; Aluminum oxide; Aluminum hydroxide: HS code chinese tariffs

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28181 -Artificial corundum, whether or not it has a chemical definition: -Artificial corundum, whether or not it has a chemical definition:

28182000 -Aluminum oxide, except for synthetic corundum -Aluminum oxide, except for synthetic corundum

28183000 -Aluminum hydroxide -Aluminum hydroxide