PE can indeed be made into stab proof vests, but the fiber weaving method for bulletproof and stab proof is different. Therefore, bulletproof vests are not stab proof, and stab proof vests are also not bulletproof.
It is understood that the design principle of bulletproof vests is to absorb and disperse the impact force of bullets through internal bulletproof materials, thereby reducing the harm to the body. However, their protective effect is not absolute and is constrained by various factors.