The most common hard bulletproof material is steel, such as the armor of armored vehicles and the steel inserts in bulletproof vests. Hard bulletproof materials rely on their own strength to resist bullets. As long as their strength and thickness meet the standard, all bullets can be blocked. Soft UD UHMWPE Fiber Fabric materials mainly dissolve the energy of the warhead by deforming the warhead after impact, contacting a larger amount of fibers, and causing the fibers to stretch, deform, and fracture, ultimately making it stop in the fiber layer and unable to penetrate.
The bulletproof vest has been constantly updated and iterated since its inception. The biggest drawback of primitive ceramic armor is that it belongs to brittle materials, and once subjected to strong collisions or falls, it will rupture or shatter. Secondly, ceramics are sensitive to temperature changes and are not resistant to high and low temperatures, making them prone to cracking.
Slowly transitioning from ceramic materials to leather or iron, but the more protective parts there are, the heavier the armor becomes. After all, iron itself is also heavy enough, and the full body armor can reach 20-30 kilograms.
Later it evolved into silk bulletproof vests, but ultimately failed due to high costs. Until today, the emergence of aramid fiber and uhmwpe fiber has led to rapid development and progress in bulletproof vests. Aramid Fiber Fabric has become the ace in bulletproof vests and clothing today, and Ballistic UD Fabric UHMWPE is gradually occupying a place.