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The lost-wax bronze casting process - Mould making |
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Page 2 of 3
Mould making:
I no longer make the moulds but send my sculpture to the foundry for the mould making and the casting.
Dividing up the sculpture for mould pieces:
The sculpture is divided into sections so that the pieces are smaller and easier to manage. The dividers or walls are made from plasticine and are carefully placed to aid the dismantling of the mould when finished.
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Silicon Rubber:
Silicon rubber is mixed with a catalyst. It is then put on to the surface of the sculpture, making sure no air bubbles form. The rubber is used because it is flexible and will capture all details.
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The cap:
Plaster -of-Paris is then mixed with water and put over the silicon. Sisal is mixed with the plaster for re-enforcement. The dividing wall is removed and preparations are made to begin the next piece.
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Preparing the next section:
The walls are removed and new ones are carefully placed for the start of the next section.
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Removing the mould:
When all the pieces have been covered in silicon and plaster, the 'plaster caps' can be removed and the
silicon peeled off.
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Almost finished the mould
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Removing the plaster cap
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Removing the silicon rubber
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