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Erbium (III) fluoride is an inorganic chemical compound of erbium from the group of fluorides .
E 1149 (OTTO) Erbium(III) fluoride, anhydrous, 99.9% Cas 13760-83-3 - used to produce erbium metal. It is used as dopant in making optical products. It is highly employed as erbium doped fluoride fibers in optical communications.