he release of oxygen (and/or other impurities) can cause undesirable chemical reactions with other materials in the local environment.
GDMS test for our Cu 99.9999%:
Chemical composition:
metl Cu content in HPCu - 1 is not lower than 99.9999%;Li, Be, B, Na, Mg, AL, Si, P, S, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, zinc, Ge, As, Se, Zr, Nb, Mo, Ag, Cd, Sn, Sb, Te, Au, Hg, Pb, Bi, Th, U master impurity element content is not greater than the sum of 0.0001%;
HPCu - 2 metl Cu content in no less than 99.9