Question:
How do bullet-proof jackets stop Armor-piercing rounds? What is Kevlar?

Dear student,

Kevlar fiber is much lighter, carbon fibre is next and the e glass is the heaviest. Also, Kevlar has a high strength-to-weight ratio while carbon fibers and e glass have a lower strength-to-weight ratio. Kevlar is also more resistant to fatigue and abrasion of the three fibres. 

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