更多關(guān)于已證實(shí)屬于一般公認(rèn)為安全（GRAS）的可直接加入食品中的物質(zhì)種類，請(qǐng)點(diǎn)擊美國(guó)FDA 21 CFR 第184部分已證實(shí)屬于一般公認(rèn)為安全（GRAS）的可直接加入食品中的物質(zhì)種類匯總

　　§ 184.1769a   Sodium metasilicate.

　?。╝） 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 °C. The commercially available forms of sodium metasilicate are the anhydrous form （Na2SiO3）, the pentahydrate （Na2SiO3·5H2O）, and the nonahydrate （Na2SiO3·9H2O）.

　　（b） The ingredient must be of a purity suitable for its intended use.

　?。╟） In accordance with §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 §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 §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 §165.110 of this chapter.

　?。╠） 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, as amended at 72 FR 10357, Mar. 8, 2007; 73 FR 8608, Feb. 14, 2008]

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編輯：foodfagui