01.

At BM Fundición we use the most traditional molding process which is sand casting, as this is a refractory material very abundant in nature and that mixed with clay, acquires cohesion and moldability without losing the permeability that makes it possible to evacuate the gases from the mold to the time the molten metal is poured.

Sand casting consists of casting a molten metal, typically alloys of iron, steel, bronze, brass, and others, into a sand mold, allowing it to solidify, and then breaking the mold to extract the casting.
For casting with metals such as iron or lead, which are significantly heavier than the sand mold, the mold box is often covered with a thick sheet to prevent a problem known as "mold float" which occurs when the pressure of the metal pushes the sand above the mold cavity, causing the process to not be carried out satisfactorily.