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date: 15 December 2019

Castlocked

  • Tim Smare

Extract

Reproduction of a three-dimensional object produced by means of a mould.

While moulds can be fashioned directly, for example by carving wood or stone, both mould and cast are usually made in a pliable or amorphous material, such as plaster of Paris, wax or clay. The model is encased in the chosen material, so as to hold an impression of its shape and surface in negative: the mould is then carefully removed and the hollow interior filled to make the positive cast. A piece-mould, a mould constructed in numerous sections, is used to facilitate removal, the small sections sometimes held in place by an outer ‘case’ mould. The modern process of casting has been simplified by the use of synthetic rubbers that can be peeled away from undercut forms and reused. Other, less versatile, flexible materials for moulds include wax, gelatin and latex rubber (see Plastic, §1). Alternatively, a one-off cast can be made with a waste-mould. If the original form is modelled in soft clay, a plaster mould of few sections is easily removed, but if there are undercut forms the mould is ‘wasted’ or chipped away from the cast. ...

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