tantalum pentoxide, white powder, specification: Ta2O5>99.99%, Nb<0.003%, Ti<0.0003%, W<0.0005%, Mo<0.0005%, Cr<0.0003%, tantalum pentoxide, white powder, quality is ok, high pure.specification: Ta2O5>99.99%, Nb<0.003%, Ti<0.0003%, W<0.0005%, Mo<0.0005%, Cr<0.0003%, Mn<0.0003%, Fe<0.0005%, Ni<0.0003%, Cu<0.0005%, Al<0.0005%,Si<0.0013%, F<0.007%, Sn<0.0003%.