1. Improvement in Mechanical Properties
With a higher level of fiber compaction, we achieve a higher fiber volume fraction in the composite. With just a 5% improvement in fiber volume fraction, we can gain about 4.2% improvement in mechanical properties. 
Of significant importance with improved fiber compaction is either enhanced fatigue life or greater load carrying capacity for the same fatigue life. Of great interest is improved structural performance with a higher fatigue endurance limit, which can be achieved through increased compaction. By increasing the volume of fibers in the compacted composite, the load share in the polymer system reduces. Thus, the conditions of fatigue crack initiation and propagation are enhanced, allowing an improved fatigue life of the polymer or increasing the load level (reducing weight) for the same polymer fatigue life.
2. Improved Damage Tolerance through Polymer Ductility
For the same application, thermoplastic polymers have a better damage tolerance when compared with thermosetting polymers. Thermoplastic polymers can absorb a higher level of energy due to the higher ductility, or more specifically, greater viscoelasticity. This improvement is mainly due to the lack of cross-linking molecules that stiffen the thermosetting polymer and make them more brittle.
3. Enhanced Moisture Absorption Resistance
The development of high temperature thermoplastic polymers with enhanced moisture absorption resistance provides a significant improvement in the glass transition temperature and the effects on moisture. This characteristic of thermoplastic polymers provides a substantial aid to the application in high moisture environments, where high occasional operational temperatures are present.
4. Better Environmental Resistance
Thermoplastic polymers tend to retain their mechanical properties with better environmental resistance. Thermoplastic 
polymers can show up to an order of magnitude lower fluid absorption against comparable thermosetting polymers. A high-end advanced epoxy polymer may have absorbed moisture levels of 0.8% weight gain, where an equivalent thermoplastic polymer may have only 0.1% weight gain.
Lower fluid absorption by weight gain results in a relatively lesser change in mechanical properties.