Liquid Silicone Rubber (LSR) Insert Molding / Overmolding with Plastic (P+R) by Ming-Li Precision

Ming-Li Precision leads the industry with its advanced Liquid Silicone Rubber (LSR) insert molding/overmolding with plastic (P+R) technology. This innovative process integrates the flexibility and durability of LSR with the structural strength of thermoplastic materials, enabling the creation of high-performance components that meet the stringent requirements of various industries.

Key Benefits of Ming-Li Precision’s LSR and Plastic (P+R) Molding:

1. Precision Engineering: Ming-Li’s specialized machinery ensures both LSR and plastic are molded with extreme precision, making this process ideal for parts requiring tight tolerances.
2. High Performance in Harsh Environments: Components made with P+R molding are resistant to extreme temperatures, chemicals, and mechanical wear, making them suitable for industries like automotive and electronics.
3. Improved Functionality: Overmolding LSR onto plastic substrates allows for enhanced functionality such as waterproofing, soft-touch surfaces, and impact protection.
4. Cost Efficiency: The integration of LSR and plastic into one component reduces assembly costs and production time.

Applications by Ming-Li Precision:

Application Area	Examples	Benefits
Automotive Components	Seals, gaskets, keypads, vibration dampening parts	Heat resistance, flexibility, and impact protection in automotive systems
Medical Devices	Surgical instruments, seals, handheld medical tools	Biocompatibility, flexibility, and chemical resistance for reliable and safe use
Consumer Electronics	Smartphone grips, buttons, protective covers	Soft-touch surfaces, waterproofing, and enhanced shock resistance
Industrial Applications	Seals for machinery, durable valve components	High resistance to chemicals and extreme temperatures for long-lasting industrial performance

Process Overview:

1. Mold Design and Insert Preparation:
   • The plastic part is either molded separately or provided as a prefabricated insert. This insert is placed into a specially designed mold for the overmolding process.
2. LSR Injection:
   • LSR is injected into the mold, encapsulating the plastic insert. The precise flow of LSR ensures complete bonding with the plastic.
3. Curing:
   • The component undergoes a high-heat curing process to solidify the LSR and form a permanent bond with the plastic substrate.
4. Ejection and Quality Control:
   • Once cured, the component is ejected from the mold and subjected to stringent quality inspections to ensure proper bonding, dimensional accuracy, and performance.

Material Compatibility:

Ming-Li Precision uses carefully selected materials for optimal bonding and performance. Common plastics used include:

• Polycarbonate (PC): Known for toughness and clarity, ideal for electronics and automotive parts.
• Polybutylene Terephthalate (PBT): Offers excellent dimensional stability, used in automotive connectors.
• Acrylonitrile Butadiene Styrene (ABS): Provides strong mechanical properties, suitable for consumer electronics and automotive applications.

LSR provides flexibility, heat resistance, and chemical inertness, making it ideal for combining with these plastics in high-performance applications.

Enhanced Precision and Durability:

Ming-Li Precision’s P+R molding process ensures tight tolerances and high repeatability, delivering products that meet industry standards for quality, durability, and performance. Their advanced facilities and highly skilled engineering teams produce complex, multi-material parts that integrate both rigid and flexible components.

Key Feature	Details
Molding Type	Liquid Silicone Rubber (LSR) insert molding/overmolding with plastic (P+R)
Key Industries	Automotive, medical devices, consumer electronics, industrial machinery
Material Combination	LSR with plastics such as Polycarbonate (PC), PBT, and ABS
Advantages	Strong chemical bonding, flexibility, heat and chemical resistance, cost-effective production
Typical Applications	Seals, gaskets, keypads, medical tools, electronic buttons, protective covers

Ming-Li Precision’s P+R molding technology combines high-performance materials in innovative ways to meet the demands of modern industries. Their ability to deliver reliable, durable, and precision-engineered components ensures they remain a leader in advanced molding technologies.

This is just a partial overview of LSR Insert Molding / Overmolding. Are they the right solutions for you? Not sure how to apply them to your next project? Just contact our technical experts and we can offer helpful advice about how to get the best results from both processes.