Liquid Silicone Rubber (LSR)

LSR injection molding is different than traditional thermoplastic injection molding. For this process, the liquid silicone is supplied in two containers, Part A and Part B, then typically mixed at a 1:1 ratio. Once mixed, the material is then injected into a hot mold where it cross-links and cures to form the part geometry.

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Watch the Liquid Silicone Rubber (LSR) Process in Action


LSR injection molding offers custom manufacturing opportunities and is a sought-after solution due to its ability to mold complex part geometries, excellent mechanical properties, and purity. Other benefits include:

  • High tear strength
  • Great optical clarity to maximize light transmittance
  • UV resistant
  • Biocompatible
  • Low compression set
  • Excellent chemical resistance
  • Withstands harsh environments ranging from low to high temperature extremes
  • Ability to overmold and bond onto a variety of substrates, such as plastics and metals
  • Customizable additives such as antimicrobial, electrical conduction, self-lubricating and antistatic


Some applications benefiting from LSR injection molding include:

  • Medical device and patient interface components
  • LED lenses and optics
  • Electrical connectors and seals
  • Infant bottle nipples, pacifiers, and toys
  • Plumbing gaskets and seals
  • Soft touch buttons/handles and appliance components
  • Consumer goods
  • Food and beverage preparation, dispensing and utensils

When plastics matter to your business, partner with EVCO.

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