Liquid Silicone Rubber (LSR)

Liquid Silicone Rubber (LSR) is a two‑component silicone system where long polysiloxane chains are reinforced with specially treated silica.

  • Component A: Platinum catalyst
  • Component B: Methylhydrogensiloxane cross‑linker with alcohol inhibitor

The key difference between LSR and High Consistency Rubber (HCR) is the flowable, liquid nature of LSR materials. While HCR can be cured with peroxide or platinum, LSR uses platinum additive curing only, ensuring precision and consistency.

Properties of Liquid Silicone Rubber

  • LSR offers several advantages across industrial and consumer applications:
  • Biocompatibility: Safe for human contact, ideal for medical devices, prosthetics, and organ parts.
  • Durability: Long‑term stability with excellent chemical resistance.
  • Temperature resistance: Performs reliably from –60°C to +250°C.
  • Electrical insulation: Provides superior conductivity protection.
  • Transparency & pigmentation: Can be coloured to match any requirement, including natural skin tones.

Why Choose LSR

  • High productivity: Perfect for small, complex elastomeric parts manufactured at scale.
  • Liquid Injection Moulding (LIM): One of the most efficient processes for producing precision silicone components.
  • Industry adoption: Widely used in automotive, medical, consumer health, food, and electronics sectors.

Applications of Liquid Silicone Rubber

  • Consumer Health & Food
  • Contact skin applicators
  • Bakeware & kitchenware
  • Baby bottle parts
  • Breast pump components
Medical Devices & Parts
  • Skin contact devices
  • Flow control valves
  • Syringe stoppers
  • Connectors & caps
  • Medical tubing & infusion pumps
  • Pull tabs
  • Gaskets & seals
Electronics & Industrial
  • Double‑colour and multi‑material housings
  • Rollers
  • Smartwatch wristbands & children’s smart bracelets
  • Gaskets and rubber seals
Automotive
  • Plastic over‑moulded parts
  • Car grommets
  • O‑rings
  • Return valves
  • Air conditioning flaps
  • Bellows gaskets
Liquid Silicone Rubber Manufacturing Capabilities
  • Keyflex offers advanced LSR moulding solutions:
  • Liquid silicone moulds
  • Liquid silicone injection moulding
  • Over‑moulding
  • Two‑shot injection moulding
  • Multiple injection moulding