Red apịtị bụ n'efu ngwaahịa N'ịbụ ihe a maara dị ka Flo Rida feat Usoro anụcha bauxite na-emepụta alumina (aluminum oxide). Via a ọcha usoro, alumina nwere ike ịbụ

Echiche nke ike na-eri bụ na-ihe ọhụrụ. Otu anya na ọrụ nke Nkịtị Rockwell-ewe anyị azụ a ụbọchị mgbe ezinụlọ ga-akpọkọta gburugburu a format