Which type of synthetic fiber is known for its resistance to moisture and mildew?

The correct answer is fiberglass, as it is a synthetic fiber that is inherently resistant to moisture and mildew. This characteristic makes fiberglass an excellent choice for applications in environments where exposure to water and humidity is common, as it does not absorb water and is not prone to fungal growth.

Fiberglass is made from fine strands of glass, which is a non-organic material. This composition contributes to its durability and longevity, especially in various airframe components and structures. Furthermore, it is often used in conjunction with resins to create strong, lightweight composites that retain their strength, even under adverse conditions.

While other materials such as polypropylene and nylon may offer some level of resistance to moisture, fiberglass stands out due to its superior performance in those regards, especially when considering application in aviation environments. Polypropylene is often resistant to moisture but can be less durable under certain stresses. Nylon, on the other hand, tends to absorb moisture, which can lead to issues such as decreased strength and durability. Therefore, fiberglass is the most suitable choice for resistance to moisture and mildew, particularly in contexts requiring the highest performance and reliability.