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Mold making tutorial: RTV Silicone Block Mold

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Published on Jul 26, 2008

Block mold explanation. This is the most basic mold method for silicone rubber. This is a good method when speed is more important than overall cost.

We used 73-45 platinum silicone for this particular mold. A cut block mold like this works best with rubber that is shore A20 or higher. This means a medium rubber. Soft rubber such as Gel-10 would be too soft and would distort at the seams.

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