---
kind: "section"
citation: "21 C.F.R. § 177.1637"
title: "21"
number: "177.1637"
heading: "Poly(oxy-1,2-ethanediyloxycarbonyl-2,6-naphthalenediylcarbonyl) resins."
url: "https://uscodex.org/cfr/21/177.1637"
---

# §177.1637. Poly(oxy-1,2-ethanediyloxycarbonyl-2,6-naphthalenediylcarbonyl) resins.


Poly(oxy-1,2-ethanediyloxycarbonyl-2,6-naphthalenediylcarbonyl) resins identified in [paragraph (a)](#a) of this section may be safely used as articles or components of articles intended for use in contact with food in accordance with the following conditions:

- (a) **Identity.** For the purpose of this section, poly(oxy-1,2-ethanediyloxycarbonyl-2,6-naphthalenediylcarbonyl) resins (CAS Reg. No. 24968-11-4) are polymers formed by catalytic transesterification of 2,6-dimethylnaphthalene dicarboxylate with ethylene glycol followed by catalytic polycondensation.
- (b) **Specifications—**
  - (1) **Density.** The density of poly(oxy-1,2-ethanediyloxycarbonyl-2,6-naphthalenediylcarbonyl) resins shall be between 1.33 and 1.40 grams per cubic centimeter.
  - (2) **Inherent viscosity.** The finished food-contact article shall have a minimum inherent viscosity of 0.55 deciliter per gram in a solution of 0.1 gram of polymer in 100 milliliters of a 25/40/35 (weight/weight/weight) solution of p-chlorophenol/tetrachloroethane/phenol. The viscosity is determined by Eastman Chemical Co.'s method ECD-A-AC-G-V-1-5, “Determination of Dilute Solution Viscosity of Polyesters,” dated May 31, 1988, which is incorporated by reference in accordance with 5 U.S.C. [552(a)](/usc/5/552.md?p=a) and [1](/usc/5/1.md) CFR [part 51](/cfr/21/part51.md). Copies are available from the Office of Food Additive Safety (HFS-200), Center for Food Safety and Applied Nutrition, Food and Drug Administration, 5001 Campus Dr., College Park, MD 20740, 240-402-1200, or may be examined at the Food and Drug Administration's Main Library, 10903 New Hampshire Ave., Bldg. 2, Third Floor, Silver Spring, MD 20993, 301-796-2039, or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.
- (c) **Extraction limitations.** A 0.5 millimeter (0.02 inch) thick sheet of resin when extracted with water at 121 °C (250 °F) for 2 hours shall yield total nonvolatile extractives not exceeding 2.0 micrograms per square inch of exposed resin surface.
- (d) **Conditions of use.** The finished food contact article shall be:
  - (1) Used in contact only with food of Types I, II, IVB, VIA, VIB, VIIB, and VIII identified in table 1 of [§ 176.170(c)](/cfr/21/176.170.md?p=c) of this chapter, under conditions of use A through H described in table 2 of [§ 176.170(c)](/cfr/21/176.170.md?p=c) of this chapter; and with food of Types III, IVA, V, VIC, VIIA, and IX identified in table 1 of [§ 176.170(c)](/cfr/21/176.170.md?p=c) of this chapter, under conditions of use C through H described in table 2 of [§ 176.170(c)](/cfr/21/176.170.md?p=c) of this chapter; and
  - (2) Identified in a manner that will differentiate the article from articles made of other polymeric resins to facilitate collection and sorting.

## Notes

### Amendments

[61 FR 14965, Apr. 4, 1996, as amended at 78 FR 14666, Mar. 7, 2013; 81 FR 5594, Feb. 3, 2016]

### Authority

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

### Source

Source: 42 FR 14572, Mar. 15, 1977, unless otherwise noted.

### Amendments

[61 FR 14965, Apr. 4, 1996, as amended at 78 FR 14666, Mar. 7, 2013; 81 FR 5594, Feb. 3, 2016]