: STO 015 (OTTO) Strontium titanium oxide wafer, <100>, diam. × thickness 1 in x 0.5 mm Cas 12060-59-2 - used as diamond stimulant, in precision optics, in varistors, and in advanced ceramics. STO 015 (OTTO) Strontium titanium oxide wafer, <100>, diam. × thickness 1 in x 0.5 mm Cas 12060-59-2 - used in in radioisotope thermoelectric generators.