For which of the following characteristics is Kevlar known?

The correct option is All of the above.

Explanation:

Kevlar is a high-strength synthetic heat-resistant para-aramid synthetic fiber. It was developed at DuPont in 1965 and is widely known for the following key characteristics:

1. Heat Resistance: Kevlar retains its strength and resilience at extremely high temperatures. It does not melt and degrades only at relatively high temperatures (around 450 °C to 480 °C).

2. High Strength: Kevlar has a high tensile strength-to-weight ratio. On an equal-weight basis, it is five times stronger than steel, making it ideal for bulletproof armor and protective gear.

3. Durability: It offers excellent resistance to impact, abrasion, cuts, chemical exposure, and mechanical stress over long periods.

Since Kevlar exhibits high heat resistance, extraordinary strength, and exceptional durability, all the given characteristics apply.