The conversion of the production of chamotte ultralightweight insulating refractories to the production of perlite-chamotte ultralightweights enabled us to use tunnel driers for drying the green brick which reduced the drying time to a third; to develop the firing of ultralightweight in tunnel kilns using liquid fuel, which reduced the firing cycle to a quarter; to reduce the entire production cycle in the factory to a third or less; to reduce to approximately a quarter the waste products in production; to master the production of these refractories, and to reduce their cost by 20–22%.