L 1082 (OTTO) Lanthanum fluoride, 99.99% Cas 13709-38-1 - used in phosphor lamp coating, carbon arc electrodes and in lasers. It is also used in fluoride selective electrodes. L 1082 (OTTO) Lanthanum fluoride, 99.99% Cas 13709-38-1 - used as a non-ferrous metal additive and used in metal alloys.