Iron (III) Oxide Anhydrous
Iron(III) oxide
CAS: 1309-37-1;1317-60-8;1332-37-2
Molecular Formula: Fe2O3
Iron (III) Oxide Anhydrous - Names and Identifiers
Iron (III) Oxide Anhydrous - Physico-chemical Properties
| Molecular Formula | Fe2O3 |
| Molar Mass | 159.69 |
| Melting Point | 1538℃ |
| Water Solubility | INSOLUBLE |
| Appearance | Red to reddish brown powder |
| Storage Condition | Room Temprature |
| Sensitive | Easily absorbing moisture |
| MDL | MFCD00011008 |
| Physical and Chemical Properties | Density 5.24 melting point 1538 ° C. Water-soluble INSOLUBLE A red transparent powder of the three crystal system. The particles are fine, the particle size is 0.01 to 0.05 μm, the specific surface area is large (10 times that of ordinary iron oxide red), the ultraviolet absorption is strong, and the light resistance and the atmospheric resistance are excellent. When light is projected onto a paint film or plastic containing a transparent iron oxide red pigment, it is in a transparent state. The relative density of 5.7g/cm3, the melting point of 1396. It is a new kind of iron pigment with unique properties. |
| Use | Mainly used as magnetic materials, pigments, polishing agents, catalysts, etc., but also for telecommunications, Instrument Industry inorganic red pigment. It is mainly used for the transparent coloring of coins, but also for the coloring of paints, inks and plastics. |
Iron (III) Oxide Anhydrous - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | R36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. |
| UN IDs | UN 1376 |
Iron (III) Oxide Anhydrous - Upstream Downstream Industry
Iron (III) Oxide Anhydrous - Reference
| Reference Show more | 1. [IF=7.147] Genyang Tang et al."Cellulose gasification with Ca–Fe oxygen carrier in chemical-looping process."Energy. 2022 Jan;239:122204 |
Iron (III) Oxide Anhydrous - Nature
Open Data Verified Data
Three-crystalline system powders of orange-red to magenta. The relative density was 5. 24. Melting point 1565 °c (decomposition). Insoluble in water, soluble in hydrochloric acid, sulfuric acid, nitric acid and alcohol-soluble. Oxygen is released during burning and can be reduced to iron by hydrogen and carbon monoxide. Good dispersion, color strength and hiding power. Oil-free and water-permeable. Temperature-resistant, light-resistant, acid-resistant, alkali-resistant.
Last Update：2025-06-10 22:55:16
Iron (III) Oxide Anhydrous - Preparation Method
Open Data Verified Data
The preparation methods include wet method and dry method. Wet products Crystal fine, soft particles, easy to grind, suitable for pigment. Dry products crystallize large, hard particles, suitable for magnetic materials, polishing materials.
- wet method: a certain amount of 5% ferrous sulfate solution is rapidly reacted with an excess of caustic soda solution (alkali excess is required to be 0. 04~0. 08g/mL), at room temperature into the air to make all the red brown ferric hydroxide colloidal solution, as the deposition of iron oxide nuclei. The above crystal nucleus as the carrier, with ferrous sulfate as the medium, into the air, at 75~85 ℃, in the presence of metallic iron, ferrous sulfate and oxygen in the air, the formation of ferric oxide (ie, iron red) it is deposited on the crystal nucleus, and the sulfate in the solution interacts with the metal iron to regenerate the ferrous sulfate, and the ferrous sulfate is oxidized into iron red by air to continue the deposition, so that the cycle is to the end of the whole process to generate iron oxide red.
- dry method: nitric acid reacts with iron flakes to form ferrous nitrate, which is cooled to crystallize, dehydrated and dried. After grinding, it is calcined at 600~700 ℃ for 8~10h, then washed with water and dried, the red iron oxide product was prepared by pulverization. Iron oxide red can also be obtained by calcining iron oxide yellow at 600 to 700 °c.
Last Update：2025-06-10 22:55:16
Iron (III) Oxide Anhydrous - Standard
Authoritative Data Verified Data
This product shall be calculated by burning to constant weight, and the content of fe203 shall not be less than 98.0%.
Last Update：2024-01-02 23:10:35
Iron (III) Oxide Anhydrous - Trait
Authoritative Data Verified Data
- This product is dark red powder; Odorless, tasteless.
- This product is insoluble in water; Soluble in boiling hydrochloric acid.
Last Update：2022-01-01 11:22:21
Iron (III) Oxide Anhydrous - Application
Open Data Verified Data
is an inorganic pigment, which is used as an anti-rust pigment in the coating industry. It is also used as a colorant for rubber, artificial marble, ground terrae, plastic, asbestos, artificial leather, leather paste and other colorants and fillers, precision instruments, polishing agent for optical glass, raw materials for producing magnetic material ferrite elements, and the like.
Last Update：2025-08-19 16:24:40
Iron (III) Oxide Anhydrous - Differential diagnosis
Authoritative Data Verified Data
take about O . l g of this product, add 5ml of dilute hydrochloric acid, boil and cool, the solution shows the identification reaction of iron salt (General rule 0301).
Last Update：2022-01-01 11:22:22
Iron (III) Oxide Anhydrous - Safety
Open Data Verified Data
packed in woven bags lined with polyethylene plastic bags, or in 3-layer Kraft paper bags, each with a net weight of 25kg. Should be stored in a dry place, do not make damp, to avoid high temperature, should be with acid, alkali Isolation. The effective storage period of unpackaged products is 3 years. Toxicity and protection: Dust-induced pneumoconiosis. The highest allowable concentration in air, iron oxide aerosol (smoke) is 5mg/m3. Pay attention to dust prevention.
Last Update：2025-06-10 22:55:16
Iron (III) Oxide Anhydrous - Exam
Authoritative Data Verified Data
soluble in water
take this product 2. 0g, 100ml water was added, and the mixture was heated and refluxed on a water bath for 2 hours, filtered, the filter residue was washed with a small amount of water, the filtrate and washing solution were combined, placed in an evaporation dish with a constant weight of 105°C, and evaporated to dryness, dry to constant weight at 105°C and leave no residue exceeding 10mg(0.5%).
insolubles in acid
take 2.0g of this product, add 25ml of hydrochloric acid, heat in water bath to dissolve, add 100ml of water, filter with No. 4 vertical melting crucible with constant weight of 105°C, filter residue with hydrochloric acid solution (1-100) wash until the washing solution is colorless, then wash with water until the washing solution does not show the reaction of chloride, dry to constant weight at 105°C, and leave no residue beyond 6mg(0. 3%).
ignition weight loss
take this product about l .O g, precision weighing, at 80(TC burning to constant weight, loss of weight should not exceed 4.0% (General 0831).
barium salt
take 0.2g of this product, add 5ml hydrochloric acid, heat to dissolve, Dropwise add 1 drop of hydrogen peroxide test solution, add 10% sodium hydroxide solution 20 m l, filter, filter, filter residue is washed with 10ml water, the filtrate and washing solution were combined, and sulfuric acid solution (2 - 10) 10m l was added, without turbidity.
Lead
take this product 2. 5G, put into 1 0 0M l plug Erlenmeyer flask, add O .lm o l/L hydrochloric acid solution 3 5 m l, stirred for 1 hour, filtered, filter residue with O. Wash with lm o l/L hydrochloric acid solution, combine the filtrate and wash solution in a 50ml measuring flask, add 0. Dilute the lm o l/L hydrochloric acid solution to the scale, shake well, as a test solution. According to Atomic Absorption Spectrophotometry (General Rule 0 4 0 6 ) , measured at a wavelength of 217.0nm. In addition, take 2.5 m l standard lead solution, put it in a 50m l measuring flask, add 1 mol/L hydrochloric acid solution 5 r a l, dilute it to the scale with water, shake it well, and determine it by the same method. The absorbance of the test solution shall not be greater than that of the control solution (0. 001%).
arsenic salt
take this product 0. 6 7G, add hydrochloric acid 7 m l, heat to dissolve, add water 2 1 m l, Dropwise add acid gasification stannous solution to make yellow fade, check according to law (General rules 0822 first method), the provisions (0.0003%) shall be met.
Last Update：2022-01-01 11:22:23
Iron (III) Oxide Anhydrous - Content determination
Authoritative Data Verified Data
take about 800g of this product, which has been burned to constant weight at 0.15°C, and weigh it precisely. Place it in a plug Erlenmeyer flask, add 5ml of hydrochloric acid, place it in a water bath and heat it to dissolve it. Add 2ml of hydrogen peroxide test solution, heat to boiling for several minutes, add 25ml of water, cool, add potassium iodide 1 .5g and hydrochloric acid 2.5ml, dense plug, shake well, in the dark for 15 minutes, with sodium thiosulfate titration solution (0. lm o l/L) titration, adding starch finger to the near end point, indicating liquid 2. 5ml, continue titration to blue disappeared. Each lm l of sodium thiosulfate titration solution (0.1 M o l/L) corresponds to 7.985 mg of fe203.
Last Update：2022-01-01 11:22:23
Iron (III) Oxide Anhydrous - Category
Authoritative Data Verified Data
pharmaceutical excipients, colorants and coating materials.
Last Update：2022-01-01 11:22:23
Iron (III) Oxide Anhydrous - Storage
Authoritative Data Verified Data
sealed storage.
Last Update：2022-01-01 11:22:24
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