Using Room Temperature Vulcanising Silicone Rubber Compounds.
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The intoduction of RTV Silicone Rubbers in various grades revolutionised my modelling and mouldmaking routines. This particular grade is soft and flexible, and white, as can be seen. It can be coloured with silicone colour pastes, or with polyester colours intended for firbre-glass resin use. It is necessary to be very particular with the weighing, because only 5% catalyst (a thin, runny liquid) is required. I have been using Wacker RTV compounds, because they are available locally from Marplas, Martineau Lane, Norwich. |
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Alec Tiranti Ltd sells RTV rubbers from General Electric of the USA which would cover most moulding requirements, including thixotropic additive for moulding onto vertical surfaces, and silicone fluid to make the compound more fluid. I have used RTV-31 when I want to make a mould for casting harness parts, or a very firm rubber for the small permanent models of the dolls house components. This is red in colour, and heat-proof up to the temperature of the molten pewter/lead alloys which I use for harness fittings and the dolls house metal parts. |
 This
model collar is made in a plaster mould. It is suitable for the harness
of the Shire Horse. It is coloured black with silicone-based pigment.
See the Harness pages. |
Back to Step Three.