The use of hot-tops in the casting of ingots was mainly introduced to eliminate the shrinkage cones which form during the change of steel from liquid to solid state. Later, new technologies, yield optimization and the need for more highly-qualified products have driven research to improve hot-top efficiency and effectiveness. For this purpose, in 1991 Faprosid developed a new type of insulating and isolating-exothermic hot-top which satisfies all the current market requirements and allows to study and produce products that meet any customer’s needs.
The easy handling due to the low specific weight, the low setting-up costs, the excellent insulating and insulating-exothermic power and the high yields have led Faprosid to be the primary hot-top manufacturer in Italy. Laboratory tests on the thermal conductivity of this new type of hot-top showed that the insulating values are higher when compared to the standard insulating and exothermic hot-tops commonly used.