what is the fibre used to make bullet proof jacket

The main fibre used to make bullet‑proof jackets (more accurately, bullet‑resistant vests) is Kevlar, a very strong synthetic aramid fibre.

Quick Scoop

• Kevlar is a man‑made aramid fibre with very high tensile strength and a low weight.

• It is woven and stacked in many layers so it can absorb and spread out the energy of a bullet instead of letting it pass through.

• Other advanced fibres like UHMWPE (e.g., Dyneema) and related aramid fibres are also used in modern bullet‑proof jackets, but exam and quiz questions typically expect “Kevlar” as the answer.

Answer for your post:
The fibre used to make bullet‑proof jackets is Kevlar. Information gathered from public forums or data available on the internet and portrayed here.