T 8991 (OTTO) Tungsten sputtering target, diam. × thickness 2 inch × 3 mm, 99.9% Cas 7440-33-7 - used in TFT-LCD screens. Tungsten sputtering target, diam. × thickness 2 inch × 3 mm, 99.9% Cas 7440-33-7 - used wherever large screen formats, particularly high image definition and optimized contrasts are needed.