Ballistic Glass Protection STANDARDS
In terms of ballistic protection goggles, there are currently three basic, internationally applicable standards. Of course, there are others, of course, but these are the most popular ones, which have become a symbol of a high degree of security. Two of them are state standards in the US - one civilian and one military, the third is European. Products that are certified to the relevant standard must also bear the appropriate marking, which we will describe below.
The first is the ANSI Z87.1 - this is the standard for goggles (including ballistic) used in the US, mainly for goggles designed for civilian use. Improvements to the standard were made twice in 2010 and 2015. Products that are certified by it must be labeled with glass. The “Z87 +” marking means that the goggles meet the requirements for impact resistance in the event of high-speed debris. That is, only glasses that have such an ANSI designation are ballistic, not just shockproof. The impact that the glasses must endure to meet the ballistic requirements is of a 6.35 mm diameter steel ball moving at a speed of 45.72 m / s. This protection standard also provides varying degrees of protection (indicated by the appropriate marking) from fogging, dust (D4), fine dust (D5), droplets and sprays of chemicals (D3), radiation (U - UV, R - infrared).
The US Army MIL-PRF-31013 is the most widely used standard in the world for ballistic goggles. In addition to ballistic protection, goggles certified there must also meet certain requirements for protection against solar radiation, resistance to chemical agents, environmental effects (do not change in temperature or humidity differences), optical purity and wearing comfort . Specifically for ballistic protection, the panes must be able to withstand shocks of 0.15 caliber (3.8 mm), 0.37 g shotgun, moving 200 m / s (720 km / h). Since its introduction in 1996, it has been repeatedly updated and refined. The modern standard that is an improved version of MIL-PRF-31013 is the MCEPS GL-PD 10-12. The glasses must successfully stop the 6.35 mm shotgun, moving at a speed of 200 m / s (simulating shotgun shot from a distance of 10 meters).
It is important to say that there are ballistic glasses on the market that meet the ballistic requirements of this Army Standard, but may not cover other of the specific criteria included therein.
The last standard we will focus on is European (CE) EN166 (also known as EN166). In this case, the degrees of protection are divided into 4 types. The lowest one is marked S - increased strength, followed by F - low energy impact (6 mm steel ball of 0.86 g, moving at a speed of 45 m / s). The B mark marks a medium energy impact - the glasses must be capable of stopping a 0.86 g 0.66 g steel ball moving at a speed of 120 m / s. The highest level of ballistic protection - A, must withstand the ball of the same size and weight, but at a speed of 190 m / s (about 685 km / h).