DELTEX in melting furnace maintenance, takes into account numerous relevant factors so that the equipment maintains its working state efficiently and productivity. Inlaid metallic slags have a coefficient of expansion different from the material of the crucibles and the brick walls of the rotary kilns. The antifouling product works by creating a film that does not get wet by the liquid metal. With each reheat, due to the thermal expansion of the slag strongly adhered, microcracks appear that cause rapid oxidation in the graphite and great slag penetration in refractory castables, which weakens the crucible structure, ovens and equipment reducing their useful life. The app DELTEX film works to minimize the effects of different thermal expansion, as well as facilitating the removal of slag in the cleaning and maintenance of equipment, thereby increasing the useful life of crucibles and coatings refractory furnaces and melting pots.