Y 1130 (OTTO) Ytterbium(III) acetate, hydrate, 99.9% Cas 15280-58-7 - used to obtain spectrally pure ytterbium. Y 1130 (OTTO) Ytterbium(III) acetate, hydrate, 99.9% Cas 15280-58-7 - used as a source for gamma rays, for the doping of stainless steel, or other active metals.