https://www.avient.com/products/long-fiber-technology/benefits-long-fiber-reinforced-thermoplastic-composites
Reinforcing design elements can also be incorporated into plastic articles to gain additional stiffness and strength above the capabilities of the material alone.
As a general rule, load forces for plastic articles should be no more than half of the material’s maximum load capability to prevent creep from occurring.
Inclusion of additional additives into long fiber composites can render molded articles radiopaque for medical diagnostic procedures.