... 4N Gallium: 99.99% Testing impurities: Na, Al, Mg, Si, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn. Total impurity ... . 5N Gallium: 99.999% Testing impurities: Na, Al, Mg, Si, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn. Total impurity ... . 6N Gallium: 99.9999% Testing impurities: Na, Al, Mg, Si, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn. Total impurity ...