Liquid Silicone Rubber Injection Molding – Precision & Quality for Medical Devices

Hochuen pioneers high‑speed liquid silicone rubber (LSR) injection molding, delivering medical devices manufactured in our ISO‑class 10,000 clean rooms.

What is Liquid Silicone Rubber Injection Molding?

Liquid silicone rubber injection molding is a precision process that produces durable, high‑volume components for a range of industries. At Hochuen, our state‑of‑the‑art machines enable us to manufacture complex medical parts with exceptional consistency.

Understanding Liquid Silicone Rubber (LSR)

LSR is an ultra‑pure silicone that remains stable under extreme temperatures and harsh environments. Platinum catalysis ensures rapid, high‑quality cross‑linking, giving the material superior resilience in both hot and cold conditions.

The manufacturing cycle requires maintaining a low temperature during mixing, then injecting the viscous resin into a heated mold where it cures into a solid, high‑strength component.

Why LSR Injection Molding Matters

This technique is critical across many sectors, especially in medical device manufacturing where sterility, precision, and material performance are paramount. Hochuen’s clean‑room facilities and advanced tooling guarantee each part meets the highest regulatory standards.

Silicone Rubber: Properties & Applications

Silicone rubber—a polymer comprising up to 30% of the silicone family—offers remarkable viscosity, elasticity, and temperature resistance. Its methyl groups give it low wettability and hydrophobicity, making it ideal for electrical insulation, micro‑chip fabrication, and other demanding applications.

Key Equipment for LSR Injection Molding

• Injector: Controls pressure and injection rate, ensuring precise delivery of liquid silicone into the mold.
• Catalyst: Enables the cross‑linking reaction that transforms the resin into a solid elastomer.
• Metering Units: Accurately measure silicone and catalyst ratios for consistent product properties.
• Supply Drum: Mixing chamber where silicone and catalyst combine before injection.
• Mixers: Ensure thorough, homogeneous mixing to avoid defects.
• Nozzle: Regulates flow and pressure, maintaining balanced mixing and molding.
• Mold Clamp: Secures the mold throughout the injection cycle, preventing leaks and ensuring dimensional accuracy.

Benefits of LSR Injection Molding

The process delivers rapid, repeatable production of high‑quality parts with minimal waste. Automated mixing and injection eliminate human error, ensuring consistent performance and enabling quick turnaround for critical medical components.