Liquid Silicone Rubber (LSR) Molds

1. Core Technologies  

• Cold Runner Systems (Valve Gated): Advanced cold runner technology to prevent material curing in the runner, ensuring zero-waste production and consistent shot weight.

• Flashless Tooling Design: High-precision mold construction with clearances controlled under 0.005mm to prevent “flashing,” which is critical given LSR’s low viscosity.

• Vacuum Venting Systems: Integrated vacuum chambers to remove air from the cavity before injection, eliminating air bubbles and scorched marks in complex geometries.

• Precision Overmolding: Expertise in bonding LSR with plastic (LSR/Thermoplastic) or metal substrates through multi-shot or insert molding processes.

2. Customer Concerns & Solutions  

• Material Waste & Cost: LSR is an expensive raw material.

  • Our Solution: We utilize Valve-Gated Cold Runner systems to eliminate runner waste, significantly reducing part cost for high-volume production.

• Part Cleanliness & Safety: Especially for medical and food-grade applications.

  • Our Solution: Production and assembly in a controlled Cleanroom Environment, using platinum-cured silicone to ensure biocompatibility and FDA compliance.

• Secondary Operations (Flash Removal): Manual de-flashing increases cost and risks damage.

  • Our Solution: We focus on “Flashless” design and high-precision CNC machining of the parting lines, delivering “ready-to-use” parts directly from the mold.

• Bonding Reliability: Concerns about the silicone peeling off the substrate.

  • Our Solution: Advanced surface pre-treatment (Plasma or Primer) and optimized overmolding parameters to ensure a robust chemical bond between LSR and other materials.

3. GPT Technical Advantages  

• Ultra-Precision Machining: Utilizing Japanese Makino and Sodick machinery to achieve the micron-level accuracy required for LSR sealing surfaces.

• Thermal Management Expertise: Sophisticated mold insulation design to maintain a cold runner area while keeping the cavity at high curing temperatures (170°C–200°C).

• Rapid Prototyping to Mass Production: We offer fast-turnaround LSR prototyping tools for functional testing before moving to high-cavitation production molds.

• Automated Production: Molds are designed for fully automated “lights-out” manufacturing with robotic part removal to ensure consistent quality and lower labor costs.

4. Typical Solutions  

• Medical Care: Respiratory masks, valves, syringe stoppers, and skin-contact medical device components.

• Automotive: High-temperature gaskets, wire harness seals, connector seals, and dampened buttons.

• Consumer Electronics: Waterproof seals for smartphones (IP68), wearable watch straps, and soft-touch buttons.

• Baby & Kitchen Products: Nursing nipples, pacifiers, and heat-resistant kitchenware (FDA/LFGB compliant).

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