From medical to the aerospace industry
Originally emerging as new insulation materials used in electro-technical designs, composites have since spread to a wide range of uses – from the medical to the aerospace industry:

Mechanical applications:

• engineering material
wear and slide parts

Electrical applications:

electrical insulation
engineering materials

Examples of mechanical applications:

Guide rings for hydraulic cylinders:

prevents metal to metal contact between piston/rod and bore/gland, absorbs
  high transverse loads. 

high wear resistance in aggressive and dust-filled environments
can be lubricated with water, oil or grease

Ball bearing cages for high-speed ball bearings:

low weight, high strength
reduces centrifugal forces, noise and wear

Example of electrical application:

Electrical insulation for traction transformers:

insulation and construction material