The other environmental test in the 06 standard is even more problematic. It specifies that each certified vest must be tumbled in an industrial machine 72,000 times while being exposed to heat and humidity. The idea is to simulate wear and aging of the ballistic material.
Which is not a bad idea. Unfortunately, the tumble test's validity is sketchy. Regardless of what material is normally used to carry the ballistic panels (for example, ripstop nylon), the vest must be submitted to the lab in a cotton or poly-cotton carrier. The reason for this requirement is simple: nylon and some of the other synthetics used for vest carriers do bad things when exposed to the heat used in the test. So the test doesn't even evaluate the wear of an actual vest. That in the eyes of some experts makes it invalid.
The tumbling test is also problematic because 72,000 tumbles is a lot of tumbles, about 10 days worth. So the testing process takes a lot longer than it used to. Some might say that's no big deal, it's just 10 days. But remember manufacturers have multiple models of vests to test and each model must be tested in multiple sizes. Oh, and there are only so many of these machines. If you're wondering why your favorite vest company hasn't certified under 06 yet, the tumble test is likely your answer. It's also one of the reasons why there are now eight labs performing this certification when there used to be two.
And even 72,000 tumbles was something of a compromise. Jeff Fackler of DuPont Protection Technologies says the maker of Kevlar was consulted by the NIJ regarding the wear testing and at one time the protocol called for months of tumbling per vest. That would have been a nightmare for the industry.
"If people had to wait several months to get a certification, then the objective of getting good quality body armor that meets the standards and provides high levels of protection wouldn't have been met," Fackler says. "The certification process needs to be efficient."