Facebook-f Google-plus-g Linkedin-in
silicone manufacturers usa

Liquid Silicone Rubber Molding

  • Home
  • Molding
  • Liquid Silicone Rubber Molding

Liquid Silicone

silicone products manufacturer

LSR Molding & Rubber Injection Molding

Liquid Silicone Rubber Illustration

Liquid silicone rubber molding is a manufacturing process that injects a two-part, low-viscosity liquid silicone elastomer into a precision mold, where it cures under heat to produce a single, finished silicone part. This part combines exceptional physical properties, biocompatibility, and dimensional consistency across high-volume production runs.

Liquid silicone molding begins with a two-part liquid rubber supplied in pail kits. High-precision pumps meter and deliver each component into the injection unit of the molding machine at an exact ratio. This ensures consistent cure chemistry from the first shot to the last. The material starts as a liquid. Therefore, it readily flows into complex geometries and tight tolerance features, which cannot reliably be filled by solid rubber compounds. Once injected, the heat triggers a platinum-catalyzed cure reaction. This produces a part that is ready for use without secondary operations.

Liquid silicone rubber is a bio-inert material. It is also biocompatible. Therefore, it has become a standard throughout the medical device industry. It also promises high-temperature resistance, tear strength, and chemical stability. These capabilities make it equally well suited for demanding industrial and consumer applications. As experienced LSR molding manufacturers, Konark’s process is built to deliver the same part quality from prototype quantities through full-volume production.

Liquid Silicone Injection

silicone products manufacturer

Molding Process

Liquid rubber silicone molding offers a set of process advantages that solid and thermoplastic molding cannot replicate.

Two-part material kits are used throughout the production process to prevent contamination. This is a critical requirement for medical silicone parts where traceability and material integrity are non-negotiable. Cold runner and flashless mold technology eliminates flash and sprues, resulting in zero secondary operations, which include trimming or deflashing. This keeps cycle times short and part-to-part consistency high.

Complex part geometries and tight dimensional tolerances can be achieved reliably because low-viscosity silicone liquid rubber fills intricate mold cavities under controlled injection pressure without causing any distortions in delicate features. The process is also highly automatable, making it one of the most scalable and efficient manufacturing routes available for high-volume silicone parts. From material metering and injection through part removal and inspection, all of it can be automated.

At Konark, incoming material quality is verified before production even begins. Tooling is precision-built to specification, and every process parameter is monitored and controlled to ensure that the millionth part will match the first.

Silicone Parts in

silicone products manufacturer

Applications and Industries

Liquid rubber for molding is used wherever a part must perform reliably in demanding, regulated, or human-contact environments.

Medical devices represent the largest and most demanding area of application for LSR. Cardiovascular components, endoscopic seals, surgical instruments, anesthesiology equipment, infusion therapy parts, ophthalmic devices, wound management products, and urological components all rely on the properties of LSR. Properties such as biocompatibility, sterilizability, and dimensional precision. Two-part kits and closed-system material handling make it practical to meet the contamination-control requirements of cleanroom medical manufacturing.

Consumer and wearable products use LSR for different uses. These include soft-touch grips, earbud tips, and skin-contact wearables. It can be considered essential where comfort, hypoallergenic properties, and durability under daily use are all simultaneously needed.

Industry and automotive applications often depend on LSR molding manufacturers for gaskets, O-rings, cable seals, and vibration isolators. These need to maintain their performance through extreme temperature changes, fluid exposure, and mechanical stress. The material’s long service life and resistance to compression set make it essential in sealing applications where replacement may be costly or even impractical.

Electronics and electrical applications often require molded LSR for connector seals, LED encapsulants, keyboard membranes, and protective overmolds. Here, electrical insulation and environmental sealing need to coexist as a unified part.

Across all of these markets, the underlying requirement is consistent: a material and process that produces the same part, to the same standard, at all times.

Konark

silicone products manufacturer

Why Konark?

At Konark Silicones, we pride ourselves on quality. Our goal is to ensure that the first and the millionth silicone part are exactly the same. Our practice includes the applications of lean manufacturing techniques and Six Sigma quality principles. Continuous improvement is also what drives everything we do. Our processes are designed to meet each customer’s project requirements exactly, from incoming material quality and precision tooling to a robust and repeatable LSR molding process that scales from the prototype to full production. 

Contact Konark Silicones today, and get one of our liquid silicone rubber molding experts to assist you with your LSR molding-dependent project. 

Liquid silicone rubber molding

Konark

silicone products manufacturer

Frequently Asked Questions on LSR Molding

LSR starts as a pumpable liquid. This allows it to fill complex geometries, thin walls, and intricate features that solid rubber compounds cannot reliably reach. It also cures faster, supports full automation, and is supplied in sealed two-part kits that make contamination control practical for medical-grade applications. Alternatively, HCR is better suited for simpler geometries, extrusion, and applications where the tooling investment for liquid silicone rubber injection molding is not justified by the required volume. 

Yes. Liquid silicone rubber is a bio-inert material and can be formulated to meet USP Class VI and ISO 10993 biocompatibility standards for skin contact, implantable, and fluid-path applications. It is also autoclavable and is resistant to gamma radiation sterilization. This makes a liquid silicone rubber mold suitable for reusable and single-use medical devices alike. 

LSR molding can achieve tight dimensional tolerances because low-viscosity material fills cavities uniformly under the controlled injection pressure. Exact tolerance capability depends on part geometry, material grade, and tooling design. However, LSR is routinely applied for precision seals, medical device components, and electronic parts where dimensional consistency is critical. Konark’s engineering team works with customers during the initial design phase to establish achievable tolerances for each application.

Yes. LSR molding is well-suited to cleanroom production because the two-part material is supplied in sealed kits, and the injection process is closed and fully automatable. Also, the mold itself can be integrated into a controlled environment. For medical and pharmaceutical applications that require ISO Class 7 or 8 cleanroom conditions, Konark can discuss the ideal production controls suitable for your specific project. 

Lead time depends on part complexity, tool design, and material selection. However, LSR injection molds are typically completed in six to twelve weeks from design approval. First article inspection parts will follow shortly after tool completion. Also, Konark works with customers from the prototyping stage through production tooling to keep the transition to volume manufacturing as efficient as possible.

Contact Konark Silicones today and one of our liquid silicone rubber molding experts will be happy to assist you with your silicone overmolding project.

Contact Konark Silicones
silicone parts

At Konark, manufacturing silicone parts and components is our passion. Silicone rapid prototyping and silicone engineering is what we do best. Our goal is to take our customers from the silicone prototyping phase to high volume production in a robust, efficient and economical process.

Get In Touch
  • 4725 E Bryson St. Anaheim, CA 92807
Contact
Explore
© 2026 KONARK SILICONE TECHNOLOGIES. All Rights Reserved.