Liquid Silicone Rubber (LSR)
Injection Molding
High-volume molding for precise, biocompatible silicone parts
Fast, Reliable Molding for
Complex Geometries
Liquid Silicone Rubber (LSR) is a two-part, platinum-cured silicone elastomer known for its low viscosity and ability to flow into intricate molds, making it ideal for high-volume production. LSR’s biocompatibility, chemical resistance, and mechanical properties make it the preferred material for tubing, seals, implantable components, and ergonomic grips.
Our LSR Molding Capabilities
- Low Viscosity - Enables easy flow into intricate molds, ideal for complex geometries.
- Fast Cure Times - Cycle times of 10 to 90 seconds, increasing throughput.
- Minimal Shrinkage and Flash-Free Production - Supports precision molding with reduced post-processing.
- Temperature Resistance - Maintains stability across temperatures from -75°F to 500°F.
- Biocompatibility - Certified to ISO 10993 and USP Class VI standards for medical use.
- Chemical Resistance - Inert to bodily fluids, alcohols, and certain acids, making it safe for implants and fluid-contact applications.
Liquid Injection Molding (LIM)
- Process Overview - The two components of LSR are metered, mixed, and injected into a cold-runner mold.
- Injection Pressure - Typically ranges from 250 to 10,000 psi.
- Applications - Ideal for multi-cavity molds and overmolded components with complex shapes.
Post-Curing for Medical Applications
Used for implantable components to reduce extractables. Typically performed at 150°C to 200°C for 2-4 hours.
- Mixing Accuracy - Automated metering systems ensure the correct ratio and prevent contamination.
- Adhesion Issues for Overmolding - Requires primers or plasma surface treatments for effective bonding with metals and plastics.
- Heat Management - Precise mold temperature control prevents scorching and ensures rapid cycle times.
- Implants and Tubing - Neurostimulators, catheters, and peristaltic pump tubing.
- Seals and Connectors - Gaskets, O-rings, and valve components for diagnostic tools.
- Ergonomic Grips - Overmolded surfaces for surgical tools and keypads.
Why Choose Cirtecfor LSR Molding?
- LSR processing expertise
- Intricate geometries
- Rapid cycle times
- Minimal post-processing
Cirtec offers deep expertise in LSR processing, delivering precision-molded components that meet the rigorous demands of medical applications. Our advanced liquid injection molding (LIM) techniques support multi-cavity production of intricate geometries with rapid cycle times and minimal post-processing.
From overmolded ergonomic grips to implantable seals and tubing, we ensure biocompatibility, chemical resistance, and long-term durability—produced at scale with efficiency and consistency.
Mold complex
shapes
with
speed, precision,
and biocompatibility
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