Overmolding with silicone offers powerful protection and enhanced functionality for a variety of substrates, from plastic to metal. Through this process, liquid silicone material is applied onto the chosen substrate before being cured to create an unbreakable bond that stands up against wear and tear.
Silicone overmolding is a manufacturing process where a layer of liquid silicone rubber is molded over an existing substrate or part to provide additional protection or improve its functionality. The process of silicone overmolding involves the following steps:
• Preparing the substrate: The substrate or part to be over-molded is first cleaned and prepared for the application of silicone. The surface must be free from dust, oil, or any other contaminants that could interfere with the adhesion of the silicone.
• A mold release agent: A mold release agent is then applied to the substrate to prevent the silicone from sticking to the surface.
• Preparing the silicone: The silicone material is prepared by mixing two components, typically a base and a curing agent, in a specific ratio. The mixture is then degassed to remove any air bubbles that may have formed.
• Overmolding: The silicone material is then injected onto the prepared substrate using a specialized injection molding machine. The liquid silicone fills the mold and cures to form a solid rubber part that is bonded to the substrate.
• Post-curing and finishing: Once the over-molded part is cured, it is removed from the mold and undergoes post-curing to ensure that it has fully cured. The part can then be trimmed or finished to meet the desired specifications.