KW-2200 Aluminum Magnesium Oxide. You describe the subject product as an environmentally hazardous substance in solid form. The provided Safety Data Sheet identifies the subject product by CAS # 11137-98-7 and indicates that it is 100% pure aluminum magnesium oxide. “KW-2200 Aluminum Magnesium Oxide” is an inorganic compound, also known as an oxometallic salt of aluminum and magnesium.
[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/N317397