Specific heats of polyvinylformal, which is insulator for superconducting wires, and carbon for thermometers are measured in the temperature range from 14K to 248K for the former and ranges from 14K to 201K and from 243K to 274K for the latter by an adiabatic calorimeter. Experimental results are represented by 6th- or 7th-polynomial equations with respect to temperature. Specific heats of polyvinylformal above 20K and ones of carbon for thermometers above 50K are precise enough for numerical analysis of the thermal stability on a superconducting coils.