<prompt> Linear coefficient of thermal expansion of composites is1 ppm oC40 ppm oC260 ppm oC1000 ppm oC  <response>: 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 