| Molecular Formula | （Fe2O3+FeO)·nH2O |
| Physical and Chemical Properties | brown powder. It is a mixture of red iron oxide and ferrous oxide. Insoluble in water, alcohol, ether, soluble in hot strong acid. The coloring power and hiding power are very high. Light resistance, good alkali resistance. Water permeability and oil permeability. Color with different processes, there are yellow brown, red brown. |
| Use | inorganic brown pigment. For plastic coloring, its scope of application is similar to iron oxide red, but for polyvinyl chloride, should avoid cooperation lead salt heat stabilizer. Also used as a paint colorant. |
brown powder. Insoluble in water, alcohol, ether, soluble in hot strong acid. The coloring power and hiding power are very high. Light resistance, good alkali resistance. Water permeability and oil permeability. Color with different processes, there are yellow brown, red brown, black Brown and so on.
used for coloring of paint, construction, rubber, plastic, etc.
The bag was packed in a multi-layer Kraft paper bag, with a net weight of 25kg per bag. Store in a ventilated, dry warehouse. Pay attention to moisture, avoid high temperature. Do not mix with acid and alkali. According to the above storage conditions, the effective storage period of unpackaged products is 3 years. Toxicity and protection: inhalation of dust can cause pneumoconiosis. The maximum allowable concentration of iron oxide aerosol (soot) is 5mg/m3. Should pay attention to dust.
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| use | inorganic brown pigment. For the coloring of plastics, its scope of application is similar to that of iron oxide red, but when used for polyvinyl chloride, it should avoid cooperating with lead salt heat stabilizers. Also used as paint colorant. |
| production method | ferrous sulfate oxidation method ferrous sulfate reacts with soda ash, and iron oxide brown is prepared by washing, filtering, drying, crushing and mixing. Its 3FeSO4 2Na2CO3 nH2O →(Fe2O3 FeO)·(n-1)H2O 3Na2SO4 3CO2 ↑ mechanical mixing method is formed by mechanical mixing and mixing of iron oxide red, iron oxide yellow and iron oxide black. |