---
kind: "section"
citation: "21 C.F.R. § 173.340"
title: "21"
number: "173.340"
heading: "Defoaming agents."
url: "https://uscodex.org/cfr/21/173.340"
---

# §173.340. Defoaming agents.


Defoaming agents may be safely used in processing foods, in accordance with the following conditions:

- (a) **They consist of one or more of the following—**
  - (1) Substances generally recognized by qualified experts as safe in food or covered by prior sanctions for the use prescribed by this section.
  - (2) **Substances listed in this paragraph (a)(2) of this section, subject to any limitations imposed—**
  - (3) Substances listed in this [paragraph (a)(3)](#a-3), provided they are components of defoaming agents limited to use in processing beet sugar and yeast, and subject to any limitations imposed:
  - (4) The substances listed in this [paragraph (a)(4)](#a-4), provided they are components of defoaming agents limited to use in processing beet sugar only, and subject to the limitations imposed:
- (b) **They are added in an amount not in excess of that reasonably required to inhibit foaming.**

## Notes

### Amendments

[42 FR 14526, Mar. 15, 1977, as amended at 43 FR 2872, Jan. 20, 1978; 46 FR 30493, June 9, 1981; 46 FR 57476, Nov. 24, 1981; 60 FR 54036, Oct. 19, 1995; 61 FR 632, Jan. 9, 1996; 63 FR 29134, May 28, 1998; 81 FR 5592, Feb. 3, 2016; 88 FR 17723, Mar. 24, 2023]

### Authority

Authority: 21 U.S.C. 321, 342, 348.

### Source

Source: 42 FR 14526, Mar. 15, 1977, unless otherwise noted.

### Amendments

[42 FR 14526, Mar. 15, 1977, as amended at 43 FR 2872, Jan. 20, 1978; 46 FR 30493, June 9, 1981; 46 FR 57476, Nov. 24, 1981; 60 FR 54036, Oct. 19, 1995; 61 FR 632, Jan. 9, 1996; 63 FR 29134, May 28, 1998; 81 FR 5592, Feb. 3, 2016; 88 FR 17723, Mar. 24, 2023]