L 1585 (OTTO) Lithium metaborate Cas no 13453-69-5 - used as a fused compound or a component for an assay. L 1585 (OTTO) Lithium metaborate Cas no 13453-69-5 - used for the analysis of wild rice for silicon, calcium, magnesium and potassium. Lithium metaborate was used to fuse with solid samples for decomposition.