Abstract: A formulation for producing a heat insulating material and the method for making the same that uses an exothermic reaction and which depends on sodium silicate, sodium hydroxide, firing clay and iron silicon. The iron silicon reacts in the alkaline medium in an exothermic reaction that results in a high release of heat. As a result of the exothermic reaction, the formulation heats up to temperatures near 100.degree. C. The formulation then starts to harden. The evolved water steam and hydrogen form pores, which allows for an increase of many times the volume of the resulting heat insulating material. The self-heating reaction causes the formulation to lose water, which leads to an increase in the dielectric qualities of the material. Additionally, the iron silicon raises the heat resistance of the resulting heat insulating material.