liquid silicone rubber elastomer in jar

Liquid silicone rubbers

NuSil® liquid silicone rubbers (LSRs) provide an excellent medical-grade material for precision-molded components, such as O-rings, gaskets, valves and seals used in medical devices.

NuSil liquid silicone rubbers (LSRs) from Avantor® have a paste-like consistency and are designed for use in high-volume precision manufacturing processes such as liquid injection molding and over-molding. They can be used to produce molded parts that feature complex geometries in a matter of seconds, especially very small to medium-sized parts, like gaskets and valves used in medical devices.

LSRs are two-part platinum-catalyzed systems that cure rapidly with increased temperatures and do not require a post-cure process. Specialty formulations are available for applications that require solvent-resistance, high-clarity or lubrication. LSRs can be supplied in both high-volume containers for full-scale production or small handheld cartridges for prototyping or small volumes.

For additional functionality, LSRs can easily incorporate additives for color, radiopacity or to create a foam-like texture. Learn more

Customization mastered

From prototype scale to mass production, NuSil has the expertise, processes and proprietary technology to customize silicones based on your unique specifications. We leverage our insight into the unique silicone chemistry and material properties to supply both off-the-shelf and custom formulations tailored to meet your process and end application performance requirements.

Learn more about how we can help you get the products you need.

Contact us

Interior NuSil silicone production technology

Product finder

Example of pacemaker with silicone components shown

Medical implants

NuSil’s liquid silicone rubbers are an excellent option for the high-throughput production of components used in long-term (> 29 days) implantable medical devices.

infant with silicone airway device

General healthcare

When fabricating components such as gaskets and valves for short-term implant (< 29 days) or external medical devices, NuSil medical-grade LSRs provide an efficient, customizable material for high-throughput automated production.

Related content

Browse additional resources related to liquid silicone rubbers.


Tensile, tear & elongation


How can we help you?

NuSil liquid silicone rubbers are versatile and highly customizable materials for high-throughput liquid injection molding processes. NuSil experts are ready to help you choose the right silicone for your requirements.

Avantor® is a leading global provider of mission-critical products and services to customers in the life sciences and advanced technologies & applied materials industries. The company operates in more than 30 countries and delivers an extensive portfolio of products and services. As our channel brand, VWR offers an integrated, seamless purchasing experience that is optimized for the way our customers do business. We set science in motion to create a better world. For information visit, and find us on Linkedin, Twitter and Facebook.