Fig 12 Release agent applied to surface of artefact prior
to moulding. Crown copyright.
Fig 13 Silicone rubber applied to surface protected with
release agent. A clay surround, or side set, forms a basis for the flange
needed to position the two halves of the mould during casting (see Figs
17 to 19). Crown copyright.
Fig 14 Reinforcing the silicone rubber with fibreglass
tape. Crown copyright.
Fig 15 Release agent is applied to the outside of the
reinforced mould, and a fibreglass support case laid up on it. Crown copyright.
Fig 16 Removing support case from mould. Crown copyright.
Fig 17 Opening the mould. Note repositioning points,
or natches (sic), built into the flange. Crown copyright.
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