The European standard EN 1063 regulates the test procedure for bullet-resistant glazing in nine different bullet classes. The lowest bulletproof class is BR1, the highest is BR7. The four lower bulletproof classes (BR1, BR2, BR3 and BR4) are designed to withstand the impact of sporting rifles, pistols or revolvers. The three higher bulletproof classes (BR5, BR6, BR7), on the other hand, have to resist the fire of long-range weapons such as the American M16 rifle or the NATO rifles G36 and G3. All weapons that are effective and accurate, even from a great distance, and that put any bullet-resistant glass to a severe test.
The classes SG1 and SG2 refer to resistance to shotgun fire. The following table describes the weapons and ammunition types for testing bullet-resistant glazing in accordance with EN 1063. By the way: the fastest projectile speed is 950 m/s – a staggering velocity of 3,400 km/h.
How is a bulletproof glass test conducted? During the ballistic test according to EN 1063, the bullet-resistant glass in 500x500mm format is fixed in a frame. The glass is then shot at three times in the middle, with the impact points forming an isosceles triangle twelve centimeters apart. The impact angle is exactly 90 degrees and the shooting distance is five or ten meters, depending on the resistance class.
The standard is met if the projectile does not penetrate the bullet-resistant glazing. In addition to the bulletproof class, the rating splinter-free (NS = no spall) is also awarded if no glass fragments escape on the protected side. In the opposite case, i.e. if glass splinters do escape on the protected side of the bullet-resistant glazing, the test result is supplemented with splinter exit (S = spall).
|BR2||Handgun||9 mm Luger||FJ1)/RN/SC||8.0||640||5||400|
|BR4||Handgun||.44 Rem. Magnum||FJ2)/FN/SC||15.6||1,510||5||440|
|BR5||Gun||5.56 x 453)||FJ2)/PB/SCP1||4.0||1,805||10||950|
|BR6||Gun||7.62 x 51||FJ1)/PB/SC||9.5||3,272||10||830|
|BR7||Gun||7.62 x 514)||FJ2)/PB/HC1||9.8||3,295||10||820|
|SG1*||Shotgun||Shotgun12/70||Lead shotgun shot5)||31||2,734||10||420|
|SG2**||Shotgun||Shotgun12/70||Lead shotgun shot5)||31||2,734||10||420|
* one shot, +/- 0.5 g, +/- 20 m/s
PB Pointed bullet
GOST is the Russian standard for bulletproof materials. Compliance requires testing with weapons and ammunition that are currently a concern in Russia, and these are naturally different from the European norm for bulletproof materials, EN 1063.
GOST differentiates between seven resistance or bulletproof classes. Starting with 9x18mm caliber pistols and ranging up to the 12.7x108mm caliber military weapons. In addition, the norm distinguishes between “standard ammunition” and “special ammunition,” which usually contains hardened cores (hard-core projectiles).
Depending on the firing class, the various weapon systems are fired at a distance of five to 50 meters from the bullet-resistant glass. The bullet weights range from approximately 3 to over 48 grams. By the way, the designations in the GOST ballistic standard can be misleading, which is why it is advisable to seek our advice. The following table gives only a rough overview of the Russian GOST norm and the corresponding bullet-resistance classes for bullet proof glass.
Of course, the Russian standard also covers a weapon that originated in the country and is particularly widespread: the Kalashnikov. More precisely the AK47, 7.62x39mm caliber, as well as its further developed variant, the AK74, 5.45x39mm caliber. Resistance to both weapons corresponds with level 4 of the Russian GOST norm. Level 5 represents resistance to the sniper rifle Dragunov, 7.62x54mm caliber, with two different ammunition types.
GOST resistance class
Caliber and Ammunition
9x19 mm, Special ammunition
5,45x39mm, Special ammunition Kalaschnikov AK74
7,62x39mm, Special ammunition Kalaschnikov AK4
7,62x54R mm,Special ammunition Dragunov
7,62x54R mm, Special ammunition Dragunov
12,7x108mm, Special ammunition
18,5 mm Shotgun, 34gr Shotgun
Of course, bullet-resistant glazing from SILATEC fulfills the Russian GOST standard. We have already carried out many ballistic tests in Russia and, of course, received the corresponding certificates. In addition, we also test our bullet-resistant glass under real conditions. And mercilessly. We deploy police and military units against it, also in South America and across Asia, as well as members of special task forces like the German GSG9 or the Austrian Cobra. With an axe, car or assault rifle – only when all these endurance tests have been passed, measured according to official bulletproof classes as well as by the brutal reality of criminal energy – only then do we find the term “bullet-resistant glass” truly justified. Perhaps you would like to test our bulletproof glass yourself? With pleasure. Just ask us about it.
The Stanag norm regulates different attack risks for bullet-resistant glazing. And it’s not very squeamish. Artillery fire is tested as well as the explosion of mines, but with the focus on armored vehicles. For an easier understanding, we will only discuss the different resistance classes with regard to our bullet-resistant glazing here. Incidentally, “Stanag” is short for “Standardization Agreement.”
The NATO standard Stanag regulates five resistance or firing classes. Starting with level 1, the lowest resistance class: it indicates resistance to rifles ranging from 5.56x45mm caliber up to 7.62x51mm caliber assault rifles. The next protection class, level 2, defines materials that withstand 7.62x39mm caliber weapons with hard-core incendiary (API) ammunition – which, to put it simply, corresponds to the Kalashnikov AK47 with hard-core incendiary ammunition. By the way, API stands for “armor-piercing incendiary.” Level 3 covers rifles with calibers of 7.62x51mm and 7.62x54 R, each with special hard-core and hard-core incendiary ammunition. Level 4 tests the caliber 14.5x114mm with special ammunition.
In the highest resistance class according to Stanag, level 5, the caliber 25x137mm is fired at the bullet-resistant glazing.
The test criteria of this standard differ significantly from those of the European standard EN 1063. Of course we also have the corresponding test certificates here.
The following table does not claim to be complete. Rather, it is only intended as a simplified representation of the five levels of the NATO Stanag standard and serves as a guide.
NATO Stanag Resistance class
Caliber and ammunition
NATO Stanag Level 1
5,56x45mm, steel and lead copper jacket
NATO Stanag Level 2
7,62x39mm, API Kalaschnikov AK47
NATO Stanag Level 3
7,62x54 R, API Dragunov
7,62x51mm,wc core Nato G3
NATO Stanag Level 4
NATO Stanag Level 5
25x137mm, Special ammunition
Is bullet resistant glass cheaper than bulletproof glass?
No. Bullet-resistant glass and bulletproof glass mean the same thing. That is, a pane of glass that stops bullets. But a word of caution: bulletproof or bullet resistant glass does not stop every gun and bullet. Rather, it protects against only the weapon/ammunition with which it was tested. So it depends on the classification of the glazing.
How thick is polycarbonate bullet resistant glass?
Bullet resistant glass-clad polycarbonate glazing is available from about 20mm (3/4") to 100mm (4"). The required thickness of the glass-clad polycarbonate depends on the weapon and ammunition. Bulletproof glass-clad polycarbonate glazing is approximately 50% thinner and lighter than conventional bullet proof glazing.
How heavy is bulletproof glass?
How much bulletproof glass weighs depends on the type of weapon it protects against. Bullet proof glass that protects against handguns usually weighs less than glazing that protects against rifles. In other words, the weight per unit of surface area of bulletproof glazing depends on the penetrating power of the weapon and the ammunition it is designed to resist. This is expressed in the corresponding bullet-resistant class. Bullet proof glass with polycarbonate weighs about 50% less than conventional bulletproof glass.
The following table shows minimum standard values for the weight per unit of surface area in (kg/m2) and pounds per square foot (psf).
|Weapon||kg/m2 from||psf from||Glass type|
|.22 LR||28||6||SILATEC BR1 NS 14/27|
|Pistole 9mm||35||7||SILATEC BR2 NS 18/35|
|Magnum .357||40||8||SILATEC BR3 NS 20/40|
|Magnum .44||52||10||SILATEC BR4 NS 25/52|
|AK47. 7,62x39||76||15||SILATEC AK47 NS 36/76|
|Nato G3 7,62 x 51||90||18||SILATEC BR6 NS 41/90|
|Nato G3 armor-piercing (AP)||126||26||SILATEC BR7 NS 63/127|
|Dragunov armor-piercing (AP)||203||42||SILATEC GOST 2014-5NS 95/203|