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- It requires a positive, which consists of a core made of a refractory material and an outer layer of wax. The positive can be produced either by direct modeling in wax over a prepared core, in which case the process is known as direct lost-wax casting, or by casting in a piece mold or flexible mold taken from a master cast.
www.britannica.com/art/sculpture/Casting-and-molding
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Jun 30, 2013 · I want to CAST an object in silicone rubber. All I am finding is how to make a silicone mold to cast stuff in resin or plaster. Can I make a resin mold and fill with silicone, and if so how?
In other words, it is the original object from which a mold, and then a cast, are made. It's what is used to make a mold from. How complicated the model is determines the kind of mold technique that must be used to successfully cast the object.
We cast a rigid foam copy from the silicone negative mould and use this to help define the best shape and make a guide for producing plaster copies.
Dec 25, 2023 · To create a positive mold, use the negative mold as a mold box and pour the silicone into the negative mold. This will create a two-part mold, which allows you to easily remove the casting material from the mold.
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Before a cast can be made, it is necessary to make a mould of the object you wish to copy. The object could be a sculpture or another cast. A traditional mould is made of plaster pieces which together are called a "piece mould". The picture shows one that has been disassembled. To make such a mould, plaster is applied to the object, a small amount ...
The pieces of the mould are fitted together and a metal armature is inserted to strengthen the final cast. The cast is made by carefully pouring plaster of Paris into the tightly assembled piece mould, which is turned and moved to prevent the formation of air bubbles. After 45 minutes the pieces of the mould can be removed and the plaster cast left...
Photographs: Beazley Archive, Ian Hiley Fine lines can normally be seen on the surface of casts made from piece moulds. Lines appear where the individual sections of the piece mould join together. The tighter the joins, the finer the lines and the better the cast. These lines, also called "flash lines", were sometimes carefully removed in the works...
Once made and used for casting, moulds are carefully numbered and stored in dry conditions against the day when they may be used again.
To this purpose a mold (negative) is taken from the object (positive). The mold can be made in different material such as wood, terracotta, plaster, or in our days, silicone rubber. This is the most complicated, work-intensive and expensive step in the production of a plaster cast.
5 days ago · The positive can be produced either by direct modeling in wax over a prepared core, in which case the process is known as direct lost-wax casting, or by casting in a piece mold or flexible mold taken from a master cast.
