[Code of Federal Regulations]
[Title 21, Volume 3]
[Revised as of April 1, 2006]
From the U.S. Government Printing Office via GPO Access
TITLE 21--FOOD AND DRUGS
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN
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
(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
(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: