---
kind: "section"
citation: "49 C.F.R. § 178.1055"
title: "49"
number: "178.1055"
heading: "Stacking test."
url: "https://uscodex.org/cfr/49/178.1055"
---

# §178.1055. Stacking test.

- (a) **General.** The stacking test must be conducted for the qualification of all Flexible Bulk Containers design types.
- (b) **Special preparation for the stacking test.** All Flexible Bulk Containers design types must be loaded to their maximum permissible gross mass.
- (c) **Test method.**
  - (1) All Flexible Bulk Containers must be placed on their base on level, hard ground and subjected to a uniformly distributed superimposed test load that is four times the design type maximum gross weight for a period of at least twenty-four hours.
  - (2) For all Flexible Bulk Containers, the load must be applied by one of the following methods:
    - (i) Four Flexible Bulk Containers of the same type loaded to their maximum permissible gross mass and stacked on the test Flexible Bulk Container;
    - (ii) The calculated superimposed test load weight loaded on either a flat plate or a reproduction of the base of the Flexible Bulk Container, which is stacked on the test Flexible Bulk Container.
- (d) **Criteria for passing the test.** There may be no deterioration that renders the Flexible Bulk Container unsafe for transportation and no loss of contents during the test or after removal of the test load.

## Notes

### Source

Source: 78 FR 1098, Jan. 7, 2013, unless otherwise noted.

### Authority

Authority: 49 U.S.C. 5101-5128; 49 CFR 1.81 and 1.97.