When traditional High-Consistency Rubber (HCR) cannot meet the demands for rapid, high-precision production, Liquid Silicone Rubber (LSR) provides the solution.
The LSR Injection Molding Process
- Material Supply: The LSR is supplied as a two-component liquid system in separate drums (Part A with a platinum catalyst, Part B with a crosslinker).
- Precise Mixing: Components are pumped at a strict 1:1 ratio into a static mixer.
- Injection & Curing: The cool liquid is injected under high pressure into a heated mold, triggering instant vulcanization.
- Rapid Ejection: The finished part is ejected in seconds, enabling extremely fast, highly automated cycle times.
Key Advantages and Applications
- Unmatched Precision: The low viscosity allows the material to fill microscopic mold details, creating flash-free parts with exceptionally tight tolerances.
- Biocompatibility: Naturally inert and hypoallergenic, LSR is standard for medical catheters, respiratory masks, and baby care products.
- Durability: Maintains tear strength and flexibility across extreme temperatures (-50°C to over 200°C).
Frequently Asked Questions
- How does LSR differ from standard solid silicone? LSR is a liquid addition-cure elastomer that cures inside a heated mold via a platinum-catalyzed process. Standard High-Temperature Vulcanized (HTV) silicone is a solid gum processed via extrusion or calendaring.
- Why is LSR preferred for high-volume manufacturing? The closed-loop liquid injection process is highly automated, significantly reducing cycle times and minimizing material waste compared to traditional compression molding.
