Chromium
- Chrome
Chromium | |
| |
| Formula | Cr |
| Structure | |
| Description | Steel-grey, lustrous metal, odorless, available as lumps, granules, powder or high purity single crystals. |
| Uses | Incr resistance & durability of metals, chromeplating other metals. |
| Registry Numbers and Inventories. | |
| CAS | 7440-47-3 |
| EC (EINECS/ELINCS) | 231-157-5 |
| RTECS | GB4200000 |
| RTECS class | Tumorigen; Mutagen |
| UN (DOT) | 3089 |
| Merck | 12,2288 |
| Beilstein/Gmelin | 16274 (G) |
| RCRA | D007 |
| Swiss Giftliste 1 | G-6529 |
| Canada DSL/NDSL | DSL |
| US TSCA | Listed |
| Austrailia AICS | Listed |
| New Zealand | Listed |
| Korea ECL | Listed |
| Properties. | |
| Formula | Cr |
| Formula mass | 51.996 |
| Melting point, °C | 1840 |
| Boiling point, °C | 2469 |
| Vapor density (air=1) | 7.14 |
| Density | 7.2 g/cm3 (20 C) |
| Solubility in water | Insoluble |
| Heat of fusion | 679.0 kJ/mol |
| Heat of vaporization | 298.8 kJ/mol |
| Hazards and Protection. | |
| Storage | Keep away from heat, sparks, and flame. Store in a tightly closed container. Keep from contact with oxidizing materials. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep away from acids. Keep containers tightly closed. Do not expose to air. Store under an inert atmosphere. |
| WHMIS | Insufficient information |
| Handling | Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Use spark-proof tools and explosion proof equipment. Avoid contact with skin and eyes. Keep container tightly closed. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. Handle under an inert atmosphere. |
| Protection | Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure. |
| Respirators | Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary. |
| Small spills/leaks | Clean up spills immediately, using the appropriate protective equipment. Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions. Remove all sources of ignition. Isolate area and deny entry. Place under an inert atmosphere. Do not use combustible materials such as paper towels to clean up spill. |
| Stability | Stable under normal temperatures and pressures. Powder or liquid is pyrophoric. |
| Incompatibilities | Ammonium nitrate, hydrogen peroxide, lithium, nitric oxiode, potassium chlorate, sulfuri dioxide, strong oxidizers, hydrochloric acid, sulfuric acid, nitrogen oxide, |
| Decomposition | Toxic chromium oxide fumes. |
| Fire. | ||||
| Autoignition, °C | 400 | |||
| Fire fighting | DO NOT USE WATER, FOAM OR carbon dioxide. Dousing metallic fires with water may generate hydrogen gas, an extremely dangerous explosion hazard, particularly if fire is in a confined environment. Use DRY sand, graphite powder, dry sodium chloride based extinguishers, G-1 or Met-L-X powder. Confining and smothering metal fires is preferable rather than applying water. | |||
| Fire potential | Moderately flammable. Combustion with moderate heating. | |||
| Hazards | Oxides from metallic fires are a severe health hazard. Fire may produce irritating, corrosive and/or toxic gases. | |||
| NFPA | Health | 2 | ||
| Flammability | 1 | |||
| Reactivity | 1 | |||
| Health. | |
| Exposure limit(s) | OSHA PEL: TWA 1 mg/m3 See Appendix C *Note: The PEL also applies to insoluble chromium salts. NIOSH REL: TWA 0.5 mg/m3 See Appendix C NIOSH IDLH: 250 mg/m3 (as Cr) |
| Poison_Class | - |
| Exposure effects | Prolonged inhalation may cause respiratory tract inflammation and lung damage. |
| Ingestion | May cause irritation of the digestive tract. May cause liver damage. |
| Inhalation | Causes respiratory tract irritation. Inhalation of fumes may cause metal fume fever, which is characterized by flu-like symptoms with metallic taste, fever, chills, cough, weakness, chest pain, muscle pain and increased white blood cell count. May cause asthma and shortness of breath. May cause headache, coughing, fever, weight loss, and pneumoconiosis. |
| Skin | Causes skin irritation. Prolonged and/or repeated contact may cause irritation and/or dermatitis. May cause skin sensitization, an allergic reaction, which becomes evident upon re-exposure to this material. |
| Eyes | Causes eye irritation. May cause conjunctivitis. |
First aid |
|
| Ingestion | Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately. |
| Inhalation | Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid. DO NOT use mouth-to-mouth respiration. |
| Skin | Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists. Wash clothing before reuse. |
| Eyes | Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately. |
| Transport. | ||
| UN number | 3089 | |
| Response guide | 170 | |
| Hazard class | 4.1 | |
| Packing Group | II; III | |
| USCG CHRIS Code | CRR | |
| HS Code | 8112 29 00 | |