There are many specific categories outlined in the PRF-31013 standard. The most common clause referenced in the standard is that of 220.127.116.11 for ballistics/impact testing. In general conversation, references to an eyewear's "ballistics" rating commonly refer to its ability to withstand impact at high velocity. Thus, we will focus on this area. To see our selection of Ballistic eyewear, click here.
The ballistic resistance of the spectacles shall be such that they will pass a Vo test using a 0.15 caliber, 5.8 grain, T37 shaped projectile at a velocity of 640 to 660 feet per second when tested as specified in 18.104.22.168.
The test shall be a Vo test conducted as specified in MIL-STD-662
using a 0.15 caliber, 5.8 grain, T37 shaped projectile with the following exceptions: electronic velocity detection devices (light beam or acoustic type) may be used to determine the velocity of the projectile, such devices placed no less than 8 inches and no more than 24 inches from the target; compressed gas propulsion of the projectile may be used. The eyewear shall be mounted on an Alderson 50th percentile male headform in the as-worn position. The 0.002 inch thick aluminum foil witness sheet shall be mounted within 2 inches of the eyewear behind the area of impact. The sample shall be hit once at normal incidence within a l-inch diameter at a point centered vertically and at a horizontal distance of 32 mm from the centerline. The sample shall be considered a failure if the aluminum foil witness sheet is punctured or if the sample is cracked.