R04200 -Nau'in 1, Reactor grade unalloyed niobium;
R04210 -Nau'i na 2, Matsayin kasuwanci wanda ba a haɗa shi da niobium ba;
R04251 -Type 3, Reactor grade niobium gami dauke da 1% zirconium;
R04261 -Nau'in 4, Kasuwanci na niobium gami da 1% zirconium;