Liquid Silicone Rubber Properties

Liquid Silicone Rubber (LSR)


Liquid Silicone Rubber
EXAMPLE: Liquid Silicone Rubber Ear Bud

When choosing materials to manufacture critical parts and components, consider liquid silicone rubber (LSR). LSR is the primary material we process at SIMTEC — as a result, there’s no better partner for your manufacturing needs, and no one more experienced in helping clients make the most of it.

Liquid silicone rubber’s characteristics and chemical properties make it an ideal material for applications spanning several different industry verticals. Keep reading to learn more, or contact SIMTEC directly for more information.

Properties of LSR Parts

LSR’s specific properties are a result of its unique chemical structure. Its backbone is formed by a series of siloxane bonds which, compared to carbon bonds, are stronger and more stable. This provides liquid silicone rubber products with:

  • Superior temperature range performance. Liquid silicone products won’t elongate at high temperatures. They also remain flexible at temperatures as low as -40˚C. High thermal stability makes LSR parts suitable for heavy-duty applications.
  • Chemical stability. Liquid silicone rubber parts are chemically inert, hypoallergenic and resistant to bacteria growth. They also feature high biocompatibility, which makes them suitable for healthcare applications. However, they can degrade when exposed to certain organic compounds, or to highly acidic or basic environments.
  • Electrical resistance. On its own, LSR offers high resistance to corona discharge, making it a good choice for use as an insulator in high-voltage applications. However, it is also possible to add conductive materials without compromising the other properties of an LSR component, so that it can be used to make keyboard contact points and other electrical parts.

Liquid silicone rubber molded parts are odorless and tasteless. Unique colors and visual effects can be achieved through the use of pigments and master-batches. Parts are also ozone and UV safe. Other notable features of liquid silicone rubber parts include:

  • Resistance to steam and humidity
  • Flame retardancy
  • Low creep and compression set
  • Weatherability
  • Vibration absorption
  • Corrosion resistance
  • Resistance to mold, mildew, and bacteria growth
  • UL component recognition
  • And more

Many different variations of LSR are available to support potential applications in a wide range of industries. To learn more about specific properties of different liquid silicone rubber products, contact SIMTEC to speak with one of our in-house engineers.


Liquid silicone rubber is a highly versatile material, and new applications for it are discovered and tested every day. It is a mainstay in healthcare manufacturing, automotive component manufacturing, electronics and consumer products, gaskets and other hardware, and many other markets.

Typical liquid silicone rubber products manufactured by SIMTEC include:

  • Catheter tubing
  • Connectors/membranes
  • Gaskets, seals, and O-rings
  • Hand instruments
  • Lighted buttons
  • Needle-free valve sights
  • Pull rings
  • Skin contact devices
  • Soft-touch buttons/surfaces
  • Steam-sterilized parts
  • Syringe tips
  • Valve components
  • And much more

At SIMTEC, we have one of the most advanced manufacturing facilities in the country, as well as a long history of helping our clients develop innovative solutions to the challenges that cost them money and affect their productivity.

Liquid silicone rubber isn’t the right choice for every application, but there’s a good chance it has applications you haven’t yet considered. For specific information regarding material and application alternatives, we recommend visiting our Technical Information page, or contacting us directly.