What is a hard armor plate
Ceramic plates are usually made of ceramic and PE. In a collision, bullets hit the ceramic layer firstly, and at the moment of contact, the ceramic layer cracks, dissipating the kinetic energy to the periphery of the impact point. And then, the PE layer is stretched and envelops warheads and shrapnel, during which the energy of bullets is consumed. In this process, there is not any impact on human body.
There are three kinds of ceramic compounds used to make ceramic plates.
Alumina ceramic has the highest density but the lowest price among the three materials. So, it is a good choice for a large-scale purchase.
2.Silicon carbide ceramic (SiC ceramic)
SiC ceramic is a relatively light material with a density much less than alumina, while slightly higher than polyethylene PE. A plate made of SiC ceramic is more comfortable to wear because of its lighter weight, but around 4-5 times costlier than alumina ceramic. Therefore, it may be an appropriate choice for wealthy clients.
3.Boron carbide ceramic
Boron carbide ceramic is very expensive with a price 8-10 time as high as SiC and a density slightly smaller than SiC. Generally, due to its high cost, it is only used to make hard armor plates with a protection level of NIJ IV. Even so, there are occasions when rich customers choose this kind of plates.
There are mainly two finishes of hard armor plates, polyurea finish and water-proof cloth:
The water-proof cloth is a layer of water-proof polyester fabric, covering the surface of a hard armor plate. It has a simple production process and lower price.
The polyurea finish is manufactured by praying the polyurea evenly on the surface of hard armor plates. A polyurea finish is about 200g heavier than a water-proof polyester fabric finish, but it can provide a certain degree of protection for human body, and the bullet hole in the polyurea finish after gun attack is also smaller than that in the water-proof polyester fabric finish. The polyurea finish is also more expensive than the water-proof polyester fabric finish.