---
kind: "section"
citation: "21 C.F.R. § 176.320"
title: "21"
number: "176.320"
heading: "Sodium nitrate-urea complex."
url: "https://uscodex.org/cfr/21/176.320"
---

# §176.320. Sodium nitrate-urea complex.


Sodium nitrate-urea complex may be safely used as a component of articles intended for use in producing, manufacturing, packing, processing, preparing, treating, packaging, transporting, or holding food, subject to the provisions of this section.

- (a) Sodium nitrate-urea complex is a clathrate of approximately two parts urea and one part sodium nitrate.
- (b) Sodium nitrate-urea complex conforming to the limitations prescribed in [paragraph (b)(1)](#b-1) of this section is used as provided in [paragraph (b)(2)](#b-2) of this section.
  - (1) **Limitations.**
    - (i) **It is used as a plasticizer in glassine and greaseproof paper.**
    - (ii) The amount used does not exceed that required to accomplish its intended technical effect or exceed 15 percent by weight of the finished paper.
  - (2) **Conditions of use.** The glassine and greaseproof papers are used for packaging dry food or as the food-contact surface for dry food.

## Notes

### Authority

Authority: 21 U.S.C. 321, 342, 346, 348, 379e.

### Source

Source: 42 FR 14554, Mar. 15, 1977, unless otherwise noted.