Why composites? Composites enable a unique combination of properties The property can be made to vary continuously over a range. Composites can sometimes attain a value of a given physical property not attainable by either of the two components alone.Why composites? • Composites enable a unique combination of properties • The property can be made to vary continuously over a range. • Composites can sometimes attain a value of a given physical property not attainable by either of the two components alone