Induction Melting           Induction furnaces are refractory lined crucibles with a water cooled induction coil installed behind the refractory. The coil is powered by alternating current that generate heat. Induction furnaces allow for closer control of the metal analysis since the chemistry can be analyzed and adjusted, if necessary, before being tapped from the furnace.   Core Processes           Shell Core – U-180, 200, 400 Type Shell cores are made using a resin coated silica sand that is invested into an iron core box. The core box is preheated to about 600 degrees Fahrenheit and the cores cure and become rigid due to the reaction between the resin and heat. The cores turn yellow in color and are hollow. The hollow shell that forms the core gives it the name “Shell Core”. Shell cores provide the best cosmetics and dimensional tolerance of all the core processes.           Isocure – Gaylord and Redford Core Isocure core process is also a cold process where binders are mixed with the sand immediately prior to being blown by compressed air into the core box. The binders are then set by a gas injected into the core box.