2. Composites are durable.
Composites never rust, regardless of their environment (though they are prone to corrosion when bonded to metal parts). Composites have less fracture toughness than metals but more than most polymers. Their high dimensional stability allows them to maintain their shape, whether hot or cold, wet or dry. This makes them a popular material for outdoor structures like wind turbine blades. Engineers choose composites over traditional materials to reduce maintenance costs and ensure long-term stability, major benefits for structures that are designed to last decades.