Co-efficient of Thermal exansion of amalgam is______________? July 22, 2019 – by admin Co-efficient of Thermal exansion of amalgam is______________? A. 6.6 a (ppm k-1) B. 11.4 a (ppm k-1) C. 14.0 a (ppm k-1)D. 25.0 a (ppm k-1)