ICL’s cells and cuvettes meet the most exacting requirements of modern spectrophotometric procedures. All spectrophotometer cells are completely fused without the use of low melting intermediate glasses or cements. In other words, quartz is fused to quartz and glass is fused to glass. This eliminates strains due to differences in coefficients of expansion found in cells fused with intermediate low melting temperature glasses. Because of the fused construction, the window joints of ICL spectrophotometer cells are unaffected by all types of cleaning solutions.