Linear coefficient of thermal expansion of composites is
Linear coefficient of thermal expansion:

TOOTH : 9-11 PPM/ oC 
AMALGAM : 25 
GOLD : 15  
COMPOSITES : 40 
GIC : 25 
DENTAL WAXES : HIGHEST 260-600 PPM/ oC 

Reference- Sturdevant 6th ed P:237
1 ppm/ oC
40 ppm/ oC
260 ppm/ oC
1000 ppm/ oC