This research uses fiber, yarn and fabric of Kevlar soak in seawater, bleach and detergent for 12 month. To analyze the reason of fabric damages and change of the bulletproof caused by damages of fiber and yarn of Kevlar in seawater, bleach and detergent for 12 month. Based on the experimental results, fiber, yarn, and fabric of Kevlar in seawater, bleach and detergent for 12 month. The breaking strength increases and reduces with soaking time, make C=O bond has be changed, crystal has be broken, and make the bulletproof has be subjected.
