chromous trifluoride
chromium(iii) fluoride
CAS: 7788-97-8
Molecular Formula: CrF3
chromous trifluoride - Names and Identifiers
chromous trifluoride - Physico-chemical Properties
| Molecular Formula | CrF3 |
| Molar Mass | 108.99 |
| Density | 3.8g/mLat 25°C(lit.) |
| Melting Point | >1000°C |
| Water Solubility | insoluble H2O; soluble HCl, violet color [MER06] |
| Vapor Presure | 0Pa at 20℃ |
| Appearance | powder |
| Color | Green |
| Exposure Limit | ACGIH: TWA 2.5 mg/m3NIOSH: IDLH 250 mg/m3; IDLH 25 mg/m3; TWA 0.5 mg/m3 |
| Merck | 14,2223 |
| Sensitive | Hygroscopic |
| Physical and Chemical Properties | Dark green crystalline powder. The relative density was 3.8. Melting point 1400 °c. Insoluble in water, soluble in hydrochloric acid, purple. |
chromous trifluoride - Risk and Safety
| Hazard Symbols | C - Corrosive |
| Risk Codes | R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. R31 - Contact with acids liberates toxic gas R34 - Causes burns |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S27 - Take off immediately all contaminated clothing. S28 - After contact with skin, wash immediately with plenty of soap-suds. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) |
| UN IDs | UN 1756 8/PG 2 |
| WGK Germany | 3 |
| RTECS | GB6125000 |
| TSCA | Yes |
| HS Code | 28261990 |
| Hazard Note | Corrosive |
| Hazard Class | 8 |
| Packing Group | II |
chromous trifluoride - Reference Information
| LogP | -2 at 20℃ |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| toxicity | Because of the low solubility of this product, the acute toxicity caused by chromium is low. Due to the decomposition of hydrogen fluoride and other toxic gases, we must pay attention to its toxicity, corrosive. Patients who inhale human vapor should be removed from the contaminated area and placed to rest and keep warm. The eyes were washed with water for 15 min when they were stimulated. For skin contact, rinse with water and then wash thoroughly with soap. The patient was immediately sent to the hospital for treatment. See other chromic anhydride. |
| Use | dyeing of wool, anti-cavity of wool. Halogenation catalysts. Hardening and coloring of marble. General reagents. used as catalyst, colorant, etc. |
| production method | chromium hydroxide is added to a reactor containing distilled water, and hydrofluoric acid is slowly added to the reaction by heating under stirring, the Chromium fluoride solution is generated, concentrated by evaporation, cooled to crystallize, centrifuged and dried to obtain a finished Chromium fluoride product. Cr(0H)3 3HF → CrF3 3H2O |
| category | corrosive article |
| toxicity grade | high toxicity |
| Acute toxicity | oral-guinea pig LDL0: 150 mg/kg |
| flammability hazard characteristics | non-combustible; Toxic corrosive hydrogen fluoride gas in case of acid; toxic fluoride and chromate fumes generated by heat |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; It is stored separately from acids and food additives |
| fire extinguishing agent | water, carbon dioxide, dry powder, foam |
| Occupational Standard | TLV-TWA 0.5 mg (chromium)/m3; 2.5 mg (fluoride)/M3 |
Last Update：2024-04-10 22:29:15
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