Molecular Formula | Cr2O3 |
Molar Mass | 151.99 |
Density | 5.21 |
Melting Point | 2435 °C |
Boling Point | 4000 °C |
Flash Point | 3000°C |
Water Solubility | Insoluble |
Solubility | Insoluble in all solvents |
Appearance | Green crystallization |
Specific Gravity | 5.22 |
Color | Pale to dark green |
Exposure Limit | NIOSH: IDLH 25 mg/m3; TWA 0.5 mg/m3 |
Merck | 14,2234 |
Storage Condition | Room Temperature |
Stability | Stable. |
Sensitive | Easily absorbing moisture |
Refractive Index | 2.551 |
MDL | MFCD00010949 |
Physical and Chemical Properties | Hexagonal or amorphous dark green powder. Metallic luster. cubic or amorphous green powder. There are usually two shades: light olive green and dark olive green. Metal color. The relative density was 5.21. Melting point 2266 °c. Boiling point 4000 °c. It has excellent heat resistance, can resist temperature of 1000 ° C. Without discoloration, and is also excellent in acid resistance and alkali resistance. Insoluble in water, insoluble in acid, soluble in hot alkali metal bromate solution. It is extremely stable to light, atmosphere, sulfur dioxide, hydrogen sulfide and other corrosive gases. It has a high hiding power, but the tinting power is not better than that of Phthalocyanine Green, the color tone is not bright enough, the particle size is hard, and the paint gloss is slightly poor. Magnetic. Toxic. |
Use | Mainly used in special steel smelting tapping mouth, slide mouth and large incinerator can be used for ceramic and enamel coloring, rubber coloring, preparation of high temperature resistant coatings, art pigments, ink for the preparation of printed notes and securities. The color of chromium oxide green is similar to that of plant chlorophyll, which can be used in camouflage paint and can be difficult to distinguish in infrared photography. Also a large number of used in metallurgy, production of refractory materials, grinding powder. It can also be used as a catalyst for organic synthesis and is a high-grade green pigment. |
Safety Description | 24/25 - Avoid contact with skin and eyes. |
WGK Germany | - |
RTECS | GB6475000 |
TSCA | Yes |
HS Code | 28199090 |
Raw Materials | Chromium(VI) oxide |
light to dark green fine six-square crystal or powder. Metallic luster. Melting point about 2435 °c; Boiling point about 3000 °c I; d25 5.22. It turned brown by heating and green after cooling. Insoluble in water, ethanol, acetone, slightly soluble in acid, alkali and hot potassium bromate solution.
It is prepared by mixing potassium dichromate with sulfur or ammonium chloride and reducing roasting. It can also be prepared by heating and decomposing chromic anhydride or ammonium dichromate or chromium hydroxide.
It is used as a spectral analysis reagent, organic synthesis catalyst, ceramic glaze color raw material, and the manufacture of chromium alloy and chromium salt.