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Magnesium oxide

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Magnesium oxide

EINECS 215-171-9
CAS No. 1309-48-4 Density 3.58 g/cm3
Solubility 5 M HCl: 0.1 M at 20 °C, clear, colorless Melting Point 2852 °C
Formula MgO Boiling Point 3600 °C
Molecular Weight 40.31 Flash Point 3600oC
Transport Information UN 1418 Appearance white or light grey powder
Safety 24/25 Risk Codes 20/22-36/37/38
Molecular Structure Molecular Structure of 1309-48-4 (Magnesium oxide) Hazard Symbols

Magnesiumoxalatedihydrate;Oxalic acid magnesium salt;magnesium monoxide;Magnesiumoxalat;Oxalic acid magnesium;Ethanedioic acid,magnesium salt;magnesium oxalate;MAGNESIUM PERMANGANATE HYDRATE;Magnesiumoxalat-2-hydrat;Mg monoxide;magnesium oxalate dihydrate,puratronic;


Magnesium oxide Consensus Reports

Reported in EPA TSCA Inventory.

Magnesium oxide Standards and Recommendations

OSHA PEL: Fume: Total Dust: TWA 10 mg/m3; Respirable Fraction: 5 mg/m3
ACGIH TLV: TWA 10 mg/m3 (fume); Not Classifiable as a Human Carcinogen
DFG MAK: 1.5 mg/m3 (fume)

Magnesium oxide Analytical Methods

For occupational chemical analysis use OSHA: #ID-125 g.

Magnesium oxide Specification

Magnesium oxide , its cas register number is 1309-48-4. It also can be called 100A (oxide); Akro-mag; Animag; Anscor P; BayMag; Calcined brucite; Calcined magnesia. Magnesium oxide (MgO), or magnesia, is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of magnesium (see also oxide).

Preparation of Magnesium oxide: 
Heating magnesium carbonate (MgCO3) or magnesium hydroxide [Mg(OH)2] produces Magnesium oxide(MgO).
 MgCO3 → MgO
 Mg(OH)2 → MgO

Use of Magnesium oxide: 
1.In medicine, it is used for relief for heartburn and sore stomach, as an antacid, magnesium supplement, and as a short-term laxative. It is also used to improve symptoms of indigestion. Side effects of magnesium oxide may include nausea and cramping.In quantities sufficient to obtain a laxative effect, side effects of long-term use include enteroliths resulting in bowel obstruction.
2.It is used extensively in electrical heating as a component of "CalRod"-styled heating elements. There are several mesh sizes available and most commonly used ones are 40 and 80 mesh per the American Foundry Society. The extensive use is due to its high dielectric strength and average thermal conductivity. MgO is usually crushed and compacted with minimal airgaps or voids. The electrical heating industry also experimented with aluminium oxide, but it is not used anymore.
3.It is used as a reference white color in colorimetry, owing to its good diffusing and reflectivity properties.It may be smoked onto the surface of an opaque material to form an integrating sphere.
4.It is used as a principal ingredient in construction materials used for fireproofing.
5.It is used by many libraries for preserving books by reacting with ambient moisture to dry the book storage areas.
6.Used as a basic refractory material for crucibles.
7.Used as an insulator in industrial cables.

You can still convert the following datas into molecular structure:

The toxicity data is as follows:

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
human TCLo inhalation 400mg/m3 (400mg/m3)   "Patty's Industrial Hygiene and Toxicology," 3rd rev. ed., Clayton, G.D., and F.E. Clayton, eds., New York, John Wiley & Sons, Inc., 1978-82. Vol. 3 originally pub. in 1979; pub. as 2n rev. ed. in 1985.Vol. 2A, Pg. 1745, 1981.

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