# 21 CFR § 173.50: Polyvinylpolypyrrolidone

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-21-173.50

## Section

- **Citation:** 21 CFR § 173.50
- **Heading:** Polyvinylpolypyrrolidone
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** September 22, 2026
- **Source:** Publisher's official text
- **Location:** Title 21—Food and Drugs > CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES > SUBCHAPTER B—FOOD FOR HUMAN CONSUMPTION > PART 173—SECONDARY DIRECT FOOD ADDITIVES PERMITTED IN FOOD FOR HUMAN CONSUMPTION > Subpart A—Polymer Substances and Polymer Adjuvants for Food Treatment

## Text

The food additive polyvinylpolypyrrolidone may be safely used in accordance with the following prescribed conditions:
(a) The additive is a homopolymer of purified vinylpyrrolidone catalytically produced under conditions producing polymerization and cross-linking such that an insoluble polymer is produced.
(b) The food additive is so processed that when the finished polymer is refluxed for 3 hours with water, 5 percent acetic acid, and 50 percent alcohol, no more than 50 parts per million of extractables is obtained with each solvent.
(c) It is used or intended for use as a clarifying agent in beverages and vinegar, followed by removal with filtration.

## Nearby sections

- [21 CFR § 173.5 § 173.5 Acrylate-acrylamide resins.](https://www.frixlaw.com/law-library/statutes/ecfr-21-173.5.md)
- [21 CFR § 173.10 § 173.10 Modified polyacrylamide resin.](https://www.frixlaw.com/law-library/statutes/ecfr-21-173.10.md)
- [21 CFR § 173.20 § 173.20 Ion-exchange membranes.](https://www.frixlaw.com/law-library/statutes/ecfr-21-173.20.md)
- [21 CFR § 173.21 § 173.21 Perfluorinated ion exchange membranes.](https://www.frixlaw.com/law-library/statutes/ecfr-21-173.21.md)
- [21 CFR § 173.25 § 173.25 Ion-exchange resins.](https://www.frixlaw.com/law-library/statutes/ecfr-21-173.25.md)
- [21 CFR § 173.40 § 173.40 Molecular sieve resins.](https://www.frixlaw.com/law-library/statutes/ecfr-21-173.40.md)
- [21 CFR § 173.45 § 173.45 Polymaleic acid and its sodium salt.](https://www.frixlaw.com/law-library/statutes/ecfr-21-173.45.md)
- [21 CFR § 173.50 § 173.50 Polyvinylpolypyrrolidone.](https://www.frixlaw.com/law-library/statutes/ecfr-21-173.50.md)
- [21 CFR § 173.55 § 173.55 Polyvinylpyrrolidone.](https://www.frixlaw.com/law-library/statutes/ecfr-21-173.55.md)
- [21 CFR § 173.60 § 173.60 Dimethylamine-epichlorohydrin copolymer.](https://www.frixlaw.com/law-library/statutes/ecfr-21-173.60.md)
- [21 CFR § 173.65 § 173.65 Divinylbenzene copolymer.](https://www.frixlaw.com/law-library/statutes/ecfr-21-173.65.md)
- [21 CFR § 173.70 § 173.70 Chloromethylated aminated styrene-divinylbenzene resin.](https://www.frixlaw.com/law-library/statutes/ecfr-21-173.70.md)
- [21 CFR § 173.73 § 173.73 Sodium polyacrylate.](https://www.frixlaw.com/law-library/statutes/ecfr-21-173.73.md)
- [21 CFR § 173.75 § 173.75 Sorbitan monooleate.](https://www.frixlaw.com/law-library/statutes/ecfr-21-173.75.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-21-173.50. Check the current official text before relying on it. Not legal advice.