---
kind: "section"
citation: "21 C.F.R. § 177.1345"
title: "21"
number: "177.1345"
heading: "Ethylene/1,3-phenylene oxyethylene isophthalate/ terephthalate copolymer."
url: "https://uscodex.org/cfr/21/177.1345"
---

# §177.1345. Ethylene/1,3-phenylene oxyethylene isophthalate/ terephthalate copolymer.


Ethylene/1,3-phenylene oxyethylene isophthalate/terephthalate copolymer (CAS Reg. No. 87365-98-8) identified in [paragraph (a)](#a) of this section may be safely used, subject to the provisions of this section, as the non-food-contact layer of laminate structures subject to the provisions of [§ 177.1395](/cfr/21/177.1395.md), and in blends with polyethylene terephthalate polymers complying with [§ 177.1630](/cfr/21/177.1630.md).

- (a) **Identity.** For the purpose of this section, ethylene/1,3-phenylene oxyethylene isophthalate/terephthalate copolymer consists of the basic copolymer produced by the catalytic polycondensation of isophthalic acid and terephthalic acid with ethylene glycol and 1,3-bis(2-hydroxyethoxy)benzene such that the finished resin contains between 42 and 48 mole-percent of isophthalic moieties, between 2 and 8 mole-percent of terephthalic moieties, and not more than 10 mole-percent of 1,3-bis(2-hydroxyethoxy)benzene moieties.
- (b) **Specifications—**
  - (1) **Density.** Ethylene/1,3-phenylene oxyethylene isophthalate/terephthalate copolymer identified in [paragraph (a)](#a) of this section has a density of 1.33±0.02 grams per cubic centimeter measured by ASTM Method D 1505-85 (Reapproved 1990), “Standard Test Method for Density of Plastics by the Density-Gradient Technique,” 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 may be obtained from the American Society for Testing and Materials, 100 Barr Harbor Dr., West Conshohocken, Philadelphia, PA 19428-2959, 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, and 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.
  - (2) **Softening point.** Ethylene/1,3-phenylene oxyethylene isophthalate/terephthalate copolymer identified in [paragraph (a)](#a) of this section has a softening point of 63±5 °C as measured by ASTM Method D 1525-87, “Standard Test Method for VICAT Softening Temperature of Plastics,” 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). The availability of this material is provided in [paragraph (b)(1)](#b-1) of this section.
- (c) **Optional adjuvant substances.** Ethylene/1,3-phenylene oxyethylene isophthalate/terephthalate copolymer, identified in [paragraph (a)](#a) of this section, may contain optional adjuvant substances required in their production. The optional adjuvants may include substances used in accordance with [§ 174.5](/cfr/21/174.5.md) of this chapter.
- (d) **Limitations.** Copolymer blends described above shall not exceed 30 percent by weight of ethylene/1,3-phenylene oxyethylene isophthalate/terephthalate copolymer. The finished blend may be used in contact with food only under conditions of use C through G, as described in table 2 of [§ 176.170(c)](/cfr/21/176.170.md?p=c) of this chapter, except that with food identified as Type III, IV-A, V, VII-A, and IX in [§ 176.170(c)](/cfr/21/176.170.md?p=c), table 1, the copolymer may be used under condition of use C at temperatures not to exceed 160 °F (71 °C).

## Notes

### Amendments

[57 FR 43399, Sept. 21, 1992, as amended at 59 FR 62318, Dec. 5, 1994; 61 FR 14481, Apr. 2, 1996; 62 FR 34628, June 27, 1997; 81 FR 5593, 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

[57 FR 43399, Sept. 21, 1992, as amended at 59 FR 62318, Dec. 5, 1994; 61 FR 14481, Apr. 2, 1996; 62 FR 34628, June 27, 1997; 81 FR 5593, Feb. 3, 2016]