Thulium (III) oxide

Synonym: Dithulium trioxide
CAS Number 12036-44-1 | MDL Number MFCD00011285 | EC Number 234-851-6

Thulium (III) oxide Chemical Structure

Product CodeTM6441
CAS Number12036-44-1
Assay (purity)99.999%
Purity methodby elemental analysis
Metal purity99.99%-Tm
Molecular weight385.87
Appearancelight yellow powder
Melting point2425C
Boiling point3945C
Molecular formulaTm2O3
Linear formulaTm2O3

Ereztech manufactures and sells this product in small and bulk volumes. Glass ampules, bottles or metal ampules or bubblers are available for packaging. For additional analytical information or details about purchasing Thulium (III) oxide contact us at

Safety information

Signal wordWARNING
Hazard statementsH315, H319, H335
Precautionary statementsP261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
In TSCA registryYes

Certificates of analysis (CoA)

If you don’t see the needed lot of Thulium (III) oxide below please contact customer support at

External identifiers for Dithulium trioxide

Pubchem CID4560139
IUPAC Nameoxygen(-2) anion; thulium(+3) cation
InchI IdentifierInChI=1S/3O.2Tm/q3*-2;2*+3

Ereztech synthesizes and sells additional TM-compounds.

To purchase Thulium (III) oxide contact us at