Test Series 6 incorporates the single package and external fire tests used by the DOT and DoD to determine the hazards of a packaged finished article. For in-process classification purposes, suitable modifications are made recognizing this series is for unfinished articles. The in-process single package tests are termed worst-case propagation tests and several variations of the test are indicated. Usually at least three configurations are needed to effectively evaluate all the situations which can be encountered in the manufacturing process. The external fire test evaluates how the material reacts when initiated by an external fire.

Worst-Case Propagation Tests

This test is used to determine whether a reaction from an unfinished article, which was accidentally fired or initiated, would propagate to other articles or parts of the process. This test is conducted by placing articles in a worst-case configuration (e.g. side-by-side, end-to-end, and/or in a pile). This test is similar to the stack test except that the articles are tested without packaging, as they are or may be found in the process, including during process upset. The unfinished or finished articles are placed on top of a steel witness plate. Sand filled inert containers or sandbags may be positioned on the sides and top of the test articles for added confinement. Wire or clamps may be used to hold the articles in place. An article near the center of the unpackaged articles is caused to function (donor). Evidence of propagation or any other observable reaction is recorded. Normally at least two trials are conducted.

External Fire Test

A stack of unfinished or finished articles as they appear in the manufacturing line is placed on a non-combustible surface (steel grate) above a lattice of dried wood soaked with diesel fuel or equivalent source. A wire basket or clamps may be used to hold the articles in place. Sufficient fuel is used to provide a 30-minute fire. The fire is ignited and the material is observed for: a) Evidence of detonation, deflagration or explosion of the total contents; b) Potentially hazardous fragmentation; and c) Thermal effects (i.e. size of the fireball, etc.).