... time. It is preferably stored in plastic containers. Specification 4N Gallium: 99.99% Testing impurities: Na, Al, Mg, Si, Ca, Ti, V, Cr ... , Ni, Cu, Zn. Total impurity content: 100 ppm max. 5N Gallium: 99.999% Testing impurities: Na, Al, Mg, Si, Ca, Ti, V ... , Ni, Cu, Zn. Total impurity content: 10 ppm max. 6N Gallium: 99.9999% Testing impurities: Na, Al, Mg, Si, Ca, Ti, V ...