Chromium(III) oxide, Cr 2O 3, HIGH PURITY , pigment, powder, ONE (1) pound
Cr2O3------------------------------------99.0% min.
Moisture------------------------------- 0.20% max.
Water soluble matter-----------------0.50% min.
Chromium compounds Cr6+ calculated as CrO3------------------- 0
PH--------------------------------------6-8
Oil absorption-------------------------12-25g/100g
Chromium(III) oxide is the inorganic compound of the formula Cr
2O
3. It is one of the principal oxides of chromium and is used as a pigment. In nature, it occurs as the rare mineral eskolaite.
Because of its considerable stability, chromia is a commonly used pigment and was originally called viridian. It is used in paints, inks, and glasses. It is the colourant in "chrome green" and "institutional green." Chromium(III) oxide is a precursor to the magnetic pigment chromium dioxide, according to the following reaction:
Cr 2O3 + 3 CrO3 → 5 CrO2 + O2
Along with many other oxides, it is used as a compound when polishing (also called stropping) the edges of knives, razors, surfaces of optical devices etc. on a piece of leather, balsa, cloth or other material. It is available in powder or wax form, and in this context it is alternatively known as "green compound".
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