L 1620 (OTTO) Lithium tetraborate, for analysis grade, 99% Cas 12007-60-2 - used as solubilizing agents for X-ray fluorescence analysis. L 1620 (OTTO) Lithium tetraborate, for analysis grade, 99% Cas 12007-60-2 - used in the laboratory as LB (Lithium borate) buffer for gel electrophoresis of DNA and RNA.