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How to Make a One-Piece Silicone Rubber Block Mold

How to Make a One-Piece Silicone Rubber Block Mold

This step-by-step mold making tutorial shows you how to make a simple, one-piece silicone block mold of a small, decorative object.

The Basics:
 Supplies & Tools Needed to Complete this Project:
Always review product safety data sheets before use.
Step One: Select Containment Area
In this case, melamine-laminated particle board was used as the “mold box” material. The mold box walls were screwed together and placed on top of a base board. Sometimes, a mold strap is used to hold all of these pieces together.
If the mold box is not going to be used to support the mold during the casting process, make sure that the rubber is thick enough between the model and mold walls so that it doesn’t deform when filled with casting material. Generally, it should be at least ½” on all sides [Figure 1]. Also, make sure that the mold box is tall enough to accommodate the appropriate mold height – at least ½” of rubber above the mold.
Step Two: Secure Model to Base
Securely fasten (e.g. screw or glue) the model to the base board.
If the model is not secured, the poured rubber may leak beneath it and it may begin to float.
NOTE: If the model is porous (e.g. plaster, wood, stone, masonry, pottery), drill a vent hole in the base board underneath the model to allow air to escape [Figure 2].
Step Three: Seal the Mold Box
To help prevent rubber from leaking out of the mold box, seal the interior edges (between walls and between walls and base board). Warmed plasticine clay was used for this process [Figure 3]. Hot melt glue is another option.

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Sep-25-2018

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