21 CFR § 573.420 - Ethyl cellulose.

---
identifier: "/us/cfr/t21/s573.420"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 573.420 - Ethyl cellulose."
title_number: 21
title_name: "Food and Drugs"
section_number: "573.420"
section_name: "Ethyl cellulose."
chapter_name: "FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES"
subchapter_number: "E"
subchapter_name: "ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS"
part_number: "573"
part_name: "FOOD ADDITIVES PERMITTED IN FEED AND DRINKING WATER OF ANIMALS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "21 U.S.C. 321, 342, 348."
regulatory_source: "41 FR 38652, Sept. 10, 1976, unless otherwise noted."
cfr_part: "573"
---


# 573.420 Ethyl cellulose.

The food additive ethyl cellulose may be safely used in animal feed in accordance with the following prescribed conditions:

(a) The food additive is a cellulose ether containing ethoxy (OC<sub>2</sub>H<sub>5</sub>) groups attached by an ether linkage and containing on an anhydrous basis not more than 2.6 ethoxy groups per anhydroglucose unit.

(b) It is used or intended for use:

(1) As a binder or filler in dry vitamin preparations to be incorporated into animal feed.

(2) As a matrix scaffolding for tracers, and the ethyl cellulose content shall not exceed 80 percent of the tracer.

[41 FR 38652, Sept. 10, 1976, as amended at 89 FR 48508, June 7, 2024]