There are many types of silicone for moulding available. Condensation and Addition cured silicones are the 2 most commonly used types.
Different Types of Common Molds. - Aeromarine Products Inc.
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Metal-silicon hybrid mold for the molding ball type intracochlear
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LSR Injection Molding vs. High Consistency Rubber
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Two Piece Silicone Mold of Small Bust - Polytek Development Corp.