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Thulium (III) oxide is a pale green solid compound, with the formula Tm2O3.
T 0155 (OTTO) Thulium(III) oxide, 99.997% Cas no 12036-44-1 - used to make a lightweight, portable x-ray machine for medical use. T 0155 (OTTO) Thulium(III) oxide, 99.997% Cas no 12036-44-1 - used in lasers with surgical applications.