The main material of body armor is Kevlar. Some have bulletproof steel plates or composite plates inserted outside Kevlar.

The original English name is KEVLAR, also translated as Kevlar. It is the brand name of an aramid fiber material product developed by Dupont Company in the United States. The original name of the material was "polyphenylene terephthalamide".

In the 1960s, the American DuPont Company developed a new type of aramid fiber composite material, aramid 1414. This aramid fiber composite material was officially commercialized in 1972 and became the product The registered trademark is Kevlar.

Because this new material has low density, high strength, good toughness, high temperature resistance, and is easy to process and form, it has attracted people's attention

At present, "Kevlar" laminated sheets Composite armor with steel and aluminum plates has been widely used not only in tanks and armored vehicles, but also in nuclear-powered aircraft carriers and guided missile destroyers, greatly improving the protective performance and maneuverability of the above-mentioned weapons. Composite materials of "Kevlar" and ceramics such as boron carbide are ideal materials for manufacturing helicopter cockpits and driver's seats. According to tests, its ability to resist armor-piercing bullets is much better than fiberglass and steel armor. In order to improve the survivability of battlefield personnel, people are paying more and more attention to the development of bulletproof vests. "Kevlar" material is also an ideal material for making bulletproof vests. It is reported that using "Kevlar" material instead of nylon and fiberglass can at least double its protective capacity under the same circumstances, and it has good flexibility and is comfortable to wear. Body armor made of this material only weighs 2 to 3 kilograms and is easy to wear and move around, so it has been adopted by police and soldiers in many countries.

In the 1980s, when China imported DuPont products, the U.S. government did not allow DuPont to import Kevlar brand products into China. Later, import restrictions were slowly relaxed.

The optical fibers used for transmission today also use Kevlar to form a protective film. The Kevlar layer has good flexibility and protects the optical fiber from damage. The Kevlar layer is generally called the buffer layer or coating layer, outside the optical fiber and within the outer skin.

7.1mm dual-core Motorola RAZR mobile phone (Motorola introduced Kevlar brand product materials into Andorid mobile phones, becoming a leader in ultra-thin materials, with a thickness of only 0.3 mm)