Describes the test method to measure the linear thermal expansion coefficients (CLTE) of thin free-standing solid (metallic, ceramic, polymeric etc.) micro-electro-mechanical system (MEMS) materials with length between 0,1 mm and 1 mm and width between 10 [mu]m and 1 mm and thickness between 0,1 [mu]m and 1 mm, which are main structural materials used for MEMS, micromachines and others.