Magnesium oxide
- Magnesia
- Calcined brusite
- Calcined magnesia
Magnesium oxide | |
| |
| Formula | MgO |
| Structure | |
| Description | Fine odorless white powder, hygroscopic. |
| Uses | Chemical intermediate medicinals & other chems, component of animal feeds, fertilizers, insulation, & wallboard, component of petroleum additives, oxychloride & oxysulfate cement, agent in pulp & paper mfr, food chem, rubber accelerator, component of electrical heating rods, misc applications. |
| Registry Numbers and Inventories. | |
| CAS | 1309-48-4 |
| EC (EINECS/ELINCS) | 215-171-9 |
| EC Safety Phrase | S 22 |
| RTECS | OM3850000 |
| RTECS class | Tumorigen; Human Data |
| UN (DOT) | 1418 |
| Merck | 12,5713 |
| Beilstein/Gmelin | 13722 (G) |
| EPA OPP | 9235 |
| Swiss Giftliste 1 | G-2368 |
| Canada DSL/NDSL | DSL |
| US TSCA | Listed |
| Austrailia AICS | Listed |
| New Zealand | Listed |
| Japan ENCS (MITI) | Listed |
| Korea ECL | Listed |
| Properties. | |
| Formula | MgO |
| Formula mass | 40.30 |
| Melting point, °C | 2800 |
| Boiling point, °C | 3600 |
| Vapor pressure, mmHg | 0.3 (1727 C) |
| Density | 3.58 g/cm3 |
| Solubility in water | 90 g/L |
| Dielectric constant | 11 (20 C) |
| Thermal expansion | 1.38E-5/L |
| Heat of fusion | 77.4 kJ/mol |
| Heat of vaporization | 330.7 kJ/mol |
| Hazards and Protection. | |
| Storage | Store in a cool, dry place. Keep away from water. Keep containers tightly closed. |
| WHMIS | Does not meet criteria |
| Handling | Wash thoroughly after handling. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation. Wash clothing before reuse. Keep from contact with moist air and steam. |
| 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 protective 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 | Wash area with soap and water. Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Do not get water inside containers. |
| Stability | Stable under normal temperatures and pressures. |
| Incompatibilities | Strong oxidizing agents; reacts violently with phosphorous pentachloride, chlorine trichloride, or bromine pentafluoride. Will absorb CO2 from air. |
| Decomposition | None. |
| Fire. | ||||
| Fire fighting | Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. To extinguish fire use water spray, dry chemical, carbon dioxide, or chemical foam. Do NOT get water inside containers. | |||
| NFPA | Health | 1 | ||
| Flammability | 0 | |||
| Reactivity | 0 | |||
| Health. | |
| Exposure limit(s) | OSHA PEL: TWA 15 mg/m3 NIOSH REL: See Appendix D NIOSH IDLH: 750 mg/m3 |
| Poison_Class | 4 |
| Exposure effects | Lethargy, hyporeflexia, weakness, and subjective feeling of thirst and heat may occur. Excessive absorption of magnesium from cathartics may result in CNS depression and seizures, most notably in renal failure patients. |
| Ingestion | May cause gastrointestinal irritation with nausea, vomiting and diarrhea. May cause central nervous system depression. |
| Inhalation | May cause 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. |
| Skin | May cause skin irritation. |
| Eyes | May cause eye irritation. |
First aid |
|
| Ingestion | 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. |
| Skin | Get medical aid if irritation develops or persists. Wash clothing before reuse. Flush skin with plenty of soap and water. |
| Eyes | Immediately 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 | 1418 | |
| Response guide | 138 | |
| USCG CHRIS Code | MGU | |
| HS Code | 2519 90 10 | |