Plaster of Paris mold making is a process through which three-dimensional solid objects, such as natural specimens or man-made items, are cast into a mold that can be used to create duplicates of the cast item; the cast can also stand on its own, as with a plaster cast of a human face. For example, an object can be cast into a Plaster of Paris mold that is then used to make duplicates out of materials such as non-ferrous metals, such as aluminum, copper or zinc, and other pourable casting media. Plaster can be used as an alternative to sand for metal casting, and it is a popular choice thanks to its plasticity while liquid and its durable hardness when dry.
A Plaster of Paris cast can be used to make molds of tiny objects weighing as little as 1 ounce, or it can be used to make molds of much larger objects weighing up to about 100 pounds. It can be used in artistic processes or the manufacturing of parts, such as lock components.
Plaster of Paris should be used with some sort of lubricant to help it release from the cast material. For example, those who are interested in making plaster casts of human faces should use Vaseline to help prevent skin adhesion.