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The dried mold is then assembled, preheated, and the metal poured. Finally, after the metal has solidified, the plaster is broken from the cast part. The mold is usually damaged from the metal so reusing is usually not done. Discarded plaster can be recycled by grinding but care must be used since silica dust causes permanent lung damage. [1] [2]
[1] [2] A mixture of wax or plaster was placed over Napoleon's face and removed after the form had hardened. From this impression, subsequent copies were cast. Much mystery and controversy surrounds the origins and whereabouts of the most original cast moulds. There are only four genuine bronze death masks known to exist. [3]
Pietro Paulo Caproni (1862–1928) was founder and co-owner of PP Caproni & Brother, Boston, Massachusetts, manufacturers of plaster reproductions of classical and contemporary statues. These 'cast' reproductions were, in an era before commercial photography, an integral educational tool in teaching people the history of art and antiquities.
Plaster cast bust of George Washington by Jean-Antoine Houdon based on a life mask cast in 1786.. A plaster cast is a copy made in plaster of another 3-dimensional form. The original from which the cast is taken may be a sculpture, building, a face, a pregnant belly, a fossil or other remains such as fresh or fossilised footprints – particularly in palaeontology (a track of dinosaur ...
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Plaster is widely used as a support for broken bones; a bandage impregnated with plaster is moistened and then wrapped around the damaged limb, setting into a close-fitting yet easily removed tube, known as an orthopedic cast. Plaster is also used in preparation for radiotherapy when fabricating individualized immobilization shells for patients ...
The mold life is dependent on four factors: the mold material, the pouring temperature, the mold temperature, and the mold configuration. Molds made from gray cast iron can be more economical to produce but have short mold lives. On the other hand, molds made from H13 tool steel may have a mold life several times greater.
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