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184.1769a Sodium metasilicate.

Home > Regulations > Direct food substances affirmed as generally recognized as safe > 184.1769a Sodium metasilicate.



[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: 21CFR184.1769a]

[Page 565]
 
                        TITLE 21--FOOD AND DRUGS
 
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN 
                          SERVICES (CONTINUED)
 
PART 184_DIRECT FOOD SUBSTANCES AFFIRMED AS GENERALLY RECOGNIZED AS 
SAFE--Table of Contents
 
        Subpart B_Listing of Specific Substances Affirmed as GRAS
 
Sec.  184.1769a  Sodium metasilicate.

    (a) Sodium metasilicate (CAS Reg. No. 6834-92-0) is a strongly 
alkaline white powder. It does not occur naturally but rather is 
synthesized by melting sand with sodium carbonate at 1400 [deg]C. The 
commercially available forms of sodium metasilicate are the anhydrous 
form (Na2SiO3), the pentahydrate 
(Na2SiO3[middot]5H2O), and the 
nonahydrate (Na2SiO3[middot]9H2O).
    (b) FDA is developing food-grade specifications for sodium 
metasilicate in cooperation with the National Academy of Sciences. In 
the interim, the ingredient must be of a purity suitable for its 
intended use.
    (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 a processing aid as defined in Sec.  
170.3(o)(24) of this chapter.
    (2) The ingredient is used to treat the following foods at levels 
not to exceed current good manufacturing practice: for use in washing 
and lye peeling of fruits, vegetables, and nuts when used in accordance 
with Sec.  173.315 of this chapter; for use as a denuding agent in 
tripe; for use as a hog scald agent in removing hair; and for use as a 
corrosion preventative in canned and bottled water when used in 
accordance with Sec.  103.35 of this chapter.
    (d) Prior sanctions for this ingredient different from the uses 
established in this section do not exist or have been waived.

[50 FR 38781, Sept. 25, 1985; 50 FR 42011, Oct. 17, 1985]





Additives that reference this regulation:


Source: U.S. Code of Federal Regulations - CFR Title 21, Part 184, Section 1769a


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