Which of the following is NOT a common brand name of aramid fibers?

The correct choice identifies polyethylene as not being a common brand name of aramid fibers. Aramid fibers, such as Nomex, Kevlar, and Twaron, are synthetic fibers known for their exceptional strength and heat resistance, which are derived from aromatic polyamides.

Nomex is widely utilized in protective clothing, especially for firefighters and other situations requiring heat resistance. Kevlar is renowned for its use in body armor and cut-resistant materials due to its high tensile strength. Twaron, similar to Kevlar, is used in various applications where strength and durability are essential, including in the aerospace and automotive industries.

Polyethylene, on the other hand, is not an aramid fiber but rather a type of plastic widely used in packaging, containers, and various other applications. It does not possess the same properties associated with aramid fibers, such as flame resistance or high tensile strength, which distinguishes it from the other options listed.