6 bulletproof levels of bulletproof cloth

6 bulletproof levels of bulletproof cloth
Bulletproof vests, also known as bulletproof vests and bulletproof vests, belong to individual protective equipment and are used to protect the human body from bullet heads or shrapnel. In terms of use, bulletproof vests can be divided into police type and military type. From the perspective of bulletproof materials, bulletproof clothing can be divided into software, hardware and soft and hard composite. The bulletproof clothing is mainly composed of a jacket and a bulletproof layer. The jacket bulletproof cloth is usually made of chemical fiber fabrics, and the bulletproof layer is mostly made of metal.
There are many foreign standards for bulletproof level, but the American NIJ standard is commonly used. There are 6 levels in this standard, namely: Level I, IIA, II, IIA, III and IV. The requirements for six levels of bulletproof vests are different:
Class I: a. 22LR or. 38 revolver with a weight of 40 grains, a speed of about 308 ~ 332 M / s and a speed of about 244 ~ 274 M / s.
Class IIa: 9 mm pelaberum with a weight of 124 grains and a speed of about 320 ~ 344 M / s, A. 357 mm magnum soft pointed bullet with a weight of 158 grains and a speed of about 366 ~ 396 M / s, a general 9 mm semi-automatic pistol or. 357 revolver.
Class II: 9 mm pelaberum with a weight of 124 grains and a speed of about 346 ~ 376 M / S is a pistol bullet fired by a. 357 mm magnum soft sharp bullet long barrel pistol or short barrel submachine gun with a weight of 158 grains and a speed of about 410 ~ 440 m / s.
III class A: 240 grains of. 44 MAG South Air pointed bullet with a speed of about 411 ~ 442 M / s, 124 grains of 9 mm pelaberum with a speed of about 411 ~ 442 M / s, all pistol bullets fired by a long barrel carbine.
Class III: it is a 7.62 mm ordinary projectile with a weight of 147 grains and a speed of about 823 ~ 853 M / s, which is all fired by the A-bomb M14.
Class IV: a.30-06 armor piercing projectile with a weight of 166 grains and a speed of about 853 ~ 884 M / s. M1 armor piercing projectile launched by garland.

Bulletproof vests above class Ⅲ a are hard bulletproof vests. Their main materials are made of metal, ceramics and other composite materials. They block the penetration of bullets with their own high hardness to achieve the purpose of bulletproof. Although it is bulky, its cost is low. It can resist rifle fire. Most foreign customers require that the protection level of bulletproof clothing is Ⅲ a.
Bulletproof vests below class Ⅲ a are soft bulletproof vests. Its main material is Kevlar and other high-strength fibers, as well as other fiber materials. The bulletproof vest is suitable for wearing, light, soft and flexible, but its cost is high. They block the penetration of bullets in their high-strength way to achieve the purpose of bulletproof. Unfortunately, today's soft bulletproof clothing can only provide different levels of protection for ordinary low-speed and medium speed pistol bullets. Among them, level I is a low protection level, which can only protect against the attack of 0.22rl inch pistol bullet and 0.38 inch pistol bullet, but it can be worn in a suit, which has the characteristics of low quality, good concealment and does not hinder the wearer's flexible action; Level IV is the level of individual bulletproof vest, which is designed for high-risk combat environment.
The strong bulletproof vest in active service is recognized as the interceptor bulletproof vest of the United States. When the "interceptor" is combined with tactical vest, KM-2 Kevlar and boron carbide ceramic insert plate, its protection level rises to level IV, providing soldiers on the battlefield with the highest level of field protection in the world.