In your submission, you describe the product at issue as 99.99% pure “Aluminum Oxide” (AHP 30), CAS # 1344-28-01. The provided Safety Data Sheet indicates that “Aluminum Oxide” is an odorless white powder. You state that this product does not contain any organic surface-active agents and is intended to be used in the production of ceramic fiber, insulating material, mullite, spinel, sintered alumina, castables, bricks, abrasive material, alumina, ceramics, glass, porcelain, and aluminum.
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/N306328