Liquid Silicone Rubber (LSR) is a platinum-cured, two-part elastomer renowned for its biocompatibility, temperature resilience, and chemical resistance. Composed of silicon, oxygen, carbon, and hydrogen, LSR’s siloxane backbone enables flexibility across industries like medical, automotive, and consumer electronics. Packson Mold, a leader in LSR injection molding since 2006, leverages this material’s unique properties to deliver precision components for critical applications.
Superior Material Properties:
Withstands temperatures from -60°C to 180°C.
Resistant to UV, chemicals, and sterilization methods (autoclave, ETO).
Biocompatible and hypoallergenic, ideal for medical devices and skin-contact products.
High Precision & Efficiency:
LSR molds enable intricate geometries, thin walls (as low as 0.2mm), and tight tolerances.
Automated LSR injection molding machines ensure high-volume production with minimal waste.
Versatility:
Available in FDA-compliant, self-adhesive, and optically clear grades.
Supports multi-shot molding for hybrid components (e.g., combining LSR with thermoplastics).
Step 1: Material Preparation
LSR is stored in two components (Part A: base polymer, Part B: catalyst). A metering unit mixes them at a 1:1 ratio, with optional color pigments added for custom hues.
Step 2: Injection & Curing
The blended material is injected into a heated mold (180–215°C) via an LSR injection machine. Heat triggers vulcanization, transforming liquid into a durable elastomer.
Step 3: Demolding & Finishing
Automated systems remove parts, ensuring consistency. Post-processing (trimming, assembly) occurs in Packson Mold’s Class 7/8 cleanrooms for medical-grade components.
Wall Thickness & Geometry:
Optimize wall thickness (0.5–5mm) to balance strength and flow.
Use uniform sections to prevent sink marks.
Undercuts & Draft Angles:
Design undercuts for easy demolding.
Minimal draft angles (0.5°–1°) suffice due to LSR’s elasticity.
Gating & Venting:
Position gates near thick sections to ensure even filling.
Microvents prevent air traps and flash.
Tolerances:
Achieve ±0.025mm/mm precision with hardened steel LSR molds.
Medical Grade: Meets ISO 13485 standards for implants and surgical tools.
Self-Adhesive Grades: Eliminate primers for overmolding onto plastics/metals.
High-Temperature Grades: Withstand automotive under-the-hood environments.
Durometer Range: 5–80 Shore A, balancing softness (e.g., seals) and rigidity (e.g., housings).
Medical: Respiratory masks, drug delivery valves, and wearable health monitors.
Automotive: Wire harness seals, vibration dampeners, and EV battery insulators.
Consumer: Baby products, kitchenware, and waterproof electronics.
Industrial: Valves, gaskets, and safety device membranes.
Packson Mold’s LSR injection moulding process adheres to:
ISO 9001: Rigorous quality management.
ISO 13485: Medical device compliance.
IATF 16949: Automotive industry standards.
Testing protocols include ASTM D412 for tensile strength and CMM for dimensional accuracy.
Expertise: 18+ years in precision LSR molds and multi-shot molding.
Facilities: 10,000 sqft facility with 60T–800T presses and 300+ annual mold capacity.
Innovation: Advanced CAD/CAM design and mold-flow simulations for defect-free production.
| Factor | LSR | HCR |
|---|---|---|
| Material Form | Liquid (two-part) | Pre-mixed solid |
| Process | Cold runner, low waste | High-temperature transfer molding |
| Efficiency | Faster curing, automated | Longer cycles, manual trimming |
| Bonding | Self-adhesive grades available | Requires primers |
LSR injection molding offers unmatched versatility for high-performance applications. Packson Mold combines cutting-edge LSR injection moulding machines, ISO-certified processes, and industry-specific expertise to deliver precision components. From prototyping to full-scale production, trust our 150+ engineers and Class 8 cleanrooms to meet your most demanding requirements.
Contact Packson Mold today to optimize your LSR component design and production.
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