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184.1431 Magnesium oxide.

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[Code of Federal Regulations]
[Title 21, Volume 3]
[Revised as of April 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR184.1431]

[Page 536]
                        TITLE 21--FOOD AND DRUGS
                          SERVICES (CONTINUED)
SAFE--Table of Contents
        Subpart B_Listing of Specific Substances Affirmed as GRAS
Sec.  184.1431  Magnesium oxide.

    (a) Magnesium oxide (MgO, CAS Reg. No. 1309-48-4) occurs naturally 
as the colorless, crystalline mineral periclase. It is produced either 
as a bulky white powder (light) or a relatively dense white powder 
(heavy) by heating magnesium hydroxide or carbonate. Heating these 
magnesium salts under moderate conditions (400[deg] to 900 [deg]C for a 
few hours) produces light magnesium oxide. Heating the salts under more 
rigorous conditions (1200 [deg]C for 12 hours) produces heavy magnesium 
oxide. Light magnesium oxide is converted to heavy magnesium oxide by 
sustained heating at high temperatures.
    (b) The ingredient meets the specifications of the Food Chemicals 
Codex, 3d Ed. (1981), p. 178, which is incorporated by reference. Copies 
are available from the National Academy Press, 2101 Constitution Ave. 
NW., Washington, DC 20418, or available for inspection at the National 
Archives and Records Administration (NARA). For information on the 
availability of this material at NARA, call 202-741-6030, or go to:
    (c) In accordance with Sec.  184.1(b)(1), the ingredient is used in 
food with no limitation other than current good manufacturing practice. 
The affirmation of this ingredient as generally recognized as safe 
(GRAS) as a direct human food ingredient is based upon the following 
current good manufacturing practice conditions of use:
    (1) The ingredient is used as an anticaking and free-flow agent as 
defined in Sec.  170.3(o)(1) of this chapter; a firming agent as defined 
in Sec.  170.3(o)(10) of this chapter; a lubricant and release agent as 
defined in Sec.  170.3(o)(18) of this chapter; a nutrient supplement as 
defined in Sec.  170.3(o)(20) of this chapter; and a pH control agent as 
defined in Sec.  170.3(o)(23) of this chapter.
    (2) The ingredient is used in foods at levels not be exceed current 
good manufacturing practice. The ingredient also may be used in infant 
formula in accordance with section 412(g) of the Federal Food, Drug, and 
Cosmetic Act (the act) or with regulations promulgated under section 
412(a)(2) of the act.
    (d) Prior sanctions for this ingredient different from the uses 
established in this section do not exist or have been waived.

[50 FR 13559, Apr. 5, 1985]

[[Page 537]]

Additives that reference this regulation:

Source: U.S. Code of Federal Regulations - CFR Title 21, Part 184, Section 1431

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