---
kind: "section"
citation: "33 C.F.R. § 159.117"
title: "33"
number: "159.117"
heading: "Chemical resistance test."
url: "https://uscodex.org/cfr/33/159.117"
---

# §159.117. Chemical resistance test.

- (a) In each case where the recognized facility doubts the ability of a material to withstand exposure to the substances listed in paragraphs [(b)](#b) and [(c)](#c) of this section a sample of the material must be tested.
- (b) A sample referred to in [paragraph (a)](#a) of this section must be partially submerged in each of the following substances for 100 hours at an ambient temperature of 22 °C.
  - (1) **Sewage.**
  - (2) **Any disinfectant that is required in the operation of the device.**
  - (3) Any chemical compound in solid, liquid or gaseous form, used, emitted or produced in the operation of the device.
  - (4) Fresh or salt (3.5 percent Sodium Chloride) flush water.
  - (5) **Toilet bowl cleaners.**
  - (6) **Engine Oil (SAE/30).**
  - (7) **Ethylene Glycol.**
  - (8) **Detergents (household and bilge cleaning type).**
- (c) A sample of the material must be doused 20 times, with a 1 hour drying period between dousings, in each of the following substances:
  - (1) **Gasoline.**
  - (2) **Diesel fuel.**
  - (3) **Mineral spirits.**
  - (4) **Turpentine.**
  - (5) **Methyl alcohol.**

## Notes

### Authority

Authority: 33 U.S.C. 1322(b)(1); 49 CFR 1.45(b). Subpart E also issued under authority of sec. 1(a)(4), Pub. L. 106-554, 114 Stat. 2763; DHS Delegation No. 00170.1, Revision No. 01.4.

### Source

Source: CGD 73-83, 40 FR 4624, Jan. 30, 1975, unless otherwise noted.