< WASTE MOULDING
DIRECT PLASTER WORK
Plaster of Paris is a highly versatile sculpting material that is ideal for all kinds of use in the artist's studio and bronze foundry alike. When correctly prepared and applied, plaster is capable of crating strong and lightweight master patterns with a lengthy storage capability. The raw materials are inexpensive and require little in the way of equipment when used. In sculpture making, plaster of Paris can be used either to create waste moulded casts, or else directly as a construction material in it’s own right.
WHICH TYPE OF PLASTER?
There are numerous versions of the basic plaster product available, most of which are formulated for the construction industry. An artist might have some special reason for using a building product such as a wall plaster, but for normal studio and foundry purposes wall and other construction trade plasters are not considered ideal.
The group of plaster products that are of most use to the sculptor are based on the 'fine casting' and 'dental casting' types. The product name may vary according to manufacturer and formulation may vary somewhat, but a choice of one from this group of plasters should be adequate for most studio studio based tasks.
One of the most effective methods of creating a large scale foundry pattern is to work SCRIMMED plaster over an expanded polystyrene cut foam core (JUTE SCRIM is a coarse woven fabric). A well made plaster/scrim combination should result in an easy to handle foundry master pattern which is strong enough for lost wax casting or sand moulding (see SAND CASTING). A foam core can be roughed out into a volumetric form by hot wire cutting, then fine tuned with a cheese grater. The foam core is finished by skinning with scrim and plaster. If necessary, the foam core can be stiffened and reinforced by inserting steel bars into the polystyrene.
WOOD PATTERNS >
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