Silica aerogel.

21 C.F.R. § 582.1711
in effectEffective: 2024-07-01
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(a) Product. Silica aerogel as a finely powdered microcellular silica foam having a minimum silica content of 89.5 percent. (b) [Reserved] (c) Limitations, restrictions, or explanation. This substance is generally recognized as safe when used as a component of antifoaming agents in accordance with good manufacturing or feeding practice.

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