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Magnesium Oxide Information

Magnesium oxide, also called magnesia, is a naturally occurring mineral found in rocks; in its natural form is called periclase. Magnesium oxide is chemically noted as MgO because it is formed by an ionic bond between one magnesium (Mg) molecule and one oxygen (O) molecule. This white powder has many useful properties that make it ideal for both industrial uses, as well as medical uses.

  1. Properties

    • Magnesium oxide has several properties that make it especially useful in electrical applications and in building materials. Magnesia has good refractoriness, meaning it can retain its strength even when exposed to high temperatures. Magnesia is also resistant to corrosion. Magnesium oxide has a high thermal conductivity but a low electrical conductivity, meaning it can transfer heat but not electricity.

    Industrial Uses

    • Magnesium oxide is used in making cement and other building materials, including bricks. In construction, wallboards made with magnesium oxide are preferred because they are fire-resistant, moisture-resistant and therefore mold-resistant, all while being strong. Magnesium oxide is commonly used in heating elements, such as storage heaters and washing machines, since it can conduct heat but not electricity.

      The ability of magnesium oxide to resist moisture makes it useful for libraries to preserve their books, as well as for rock climbers who use it to reduce sweat and moisture on their hands.

    Medical Uses

    • For medical purposes, magnesium oxide is available in tablets and capsules for oral use. It is commonly taken to relieve acid indigestion, heartburn and sour stomach. It can also be used as a laxative for short-term purposes, such as for emptying the bowels prior to surgery. Since magnesium is a necessary mineral for the body, magnesium oxide can also be taken as a supplement when not enough magnesium is consumed through diet.

    Dosing

    • There are several different formulations of magnesium oxide available, and it is available without a prescription. Magnesium oxide should only be taken as directed, so consult your doctor and follow the package instructions exactly. When taking magnesium oxide as a laxative, be sure to take with a full eight ounces of liquid, and do not take it for more than one week unless directed otherwise by your doctor. Since magnesium oxide may possess an unpleasant taste, take it with fruit juice.

    Side Effects

    • Magnesium oxide can produce some unwanted side effects. The most common side effects are cramping and diarrhea. If these do not subside or are severe, contact your doctor. If you experience rash, itching, dizziness, mood changes, weakness, nausea or vomiting, contact your doctor immediately.

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