Silicone Injection Molding

LSR injection molding is a manufacturing process used to produce high-precision and complex silicone rubber components and products. In this process, liquid silicone rubber material is heated and injected into a mold cavity under pressure, where it takes the shape of the mold and cures into a solid silicone part. Try our manufacturing service for most of applications including: Medical Devices, Automotive Industry, Electronic Components, Industrial Sector, Baby Products etc.

LSR Injection Molding Advantages

Precision and Detail: LSR injection molding allows for intricate and detailed designs, making it suitable for producing complex parts with tight tolerances.

Biocompatibility: LSR is a biocompatible material, making it safe for use in medical and healthcare applications, such as medical devices and implants.

Temperature Resistance: LSR exhibits excellent temperature resistance, maintaining its properties over a wide range of temperatures.

Chemical Resistance: LSR is highly resistant to chemicals, solvents, and other harsh substances, making it suitable for various industrial applications.

Versatility: LSR can be used for a wide range of products, from consumer goods to automotive components to medical devices.

Low Waste: The injection molding process generates less waste compared to traditional manufacturing methods.

Design Flexibility: Silicone offers the ability to fill part geometries with tighter tolerances than are possible with a thermoplastic elastomer. Precise features, varying wall thickness, reduced likelihood of sink, small undercuts and negative draft are all possible with LSR.


Main Process of Silicone Injection Molding

Raw Material Preparation: First, liquid silicone rubber (LSR) material is mixed with silicone crosslinker and silicone-based fillers to form an LSR compound.

Injection by Injection Molding Machine: The prepared LSR compound is fed into the hopper of the injection molding machine. The machine then heats and injects the LSR compound into the mold cavity.

Mold Filling and Curing: In the mold cavity, the LSR compound quickly fills the entire cavity and then cures due to its inherent heat-reactive properties, forming a solid silicone rubber product.

Cooling and Demolding: After molding, the mold requires cooling to stabilize the silicone rubber. Once cooled, the mold opens, and the solid silicone rubber product is removed, completing the demolding process.

Trimming and Inspection: The extracted silicone rubber product may need trimming to remove excess edges or flash. Then, the finished product undergoes quality inspection to ensure it meets design specifications and quality standards.

Post-processing: For certain applications, post-processing such as surface coating, printing, or bonding may be required.


Why Choose Us to Custom Your LSR Molding Service?

15+ Years Silicone Rubber & Plastic Injection Molding Manufacturing Experience


Extensive Production Capacity

YJC offers exciting design and molding opportunities through silicone injection molding. With over 10 sets of LSR injection machines ranging from 60 to 160 tons, our advanced manufacturing facility ensures extensive production capacity and flexibility. Supported by advanced control technology, we deliver high-quality LSR products promptly and provide customized solutions tailored to our customers' specific needs.

Biocompatibility&Performance Properties

We meticulously select and test LSR materials to meet strict medical and healthcare biocompatibility standards for components intended for human contact. Our production process takes place in an advanced 8-grade cleaning room, ensuring a controlled and sterile environment for manufacturing medical-grade LSR components. Adhering to international standards like ISO 9001, our LSR components are safe for medical applications, meeting the stringent requirements of the medical industry.

Multi-material Molding

We excels in multi-material molding, incorporating two-shot, insert, and overmolding techniques. With this advantage, we can combine different LSR materials with other materials in a single mold, allowing for diverse and complex product designs. This flexibility enables us to meet various performance requirements, customize colors, simplify manufacturing processes, and enhance product quality, positioning us as a leading provider in the LSR injection molding industry.

Precise Control

By using high-precision injection molding machines and advanced control systems, we can monitor and adjust key parameters like temperature, pressure, and speed in real-time, ensuring stable and consistent LSR injection. This precise control guarantees consistent product dimensions and quality, meeting the stringent demands for high-quality LSR products from our customers. Whether it's small-batch or large-scale production, we maintain a high level of accuracy throughout the manufacturing process.

Concept-to-market Silicone Manufacturing

YJC’s silicone divisions offer full-service LSR manufacturing capabilities, including product R&D, prototyping with production representative tooling, LSR tooling manufacturing, class 8 cleanroom production, multi-shot/multi-material molding, and secondary operations for single-source production.

Our Silicone Injection Molding Special Capabilities


Micro & Nano Technology

Components below 10 milligrams in weight
Flashless production possible with needlepoint injection technology and fully automated parts handling


Thin Sections

10mm (0.004 inch) or less
Ideal for thin membranes
Perfect consistency in thickness and quality
No pin holes


Delicate Parts

Formed reliably every time
Flashless production possible with special tool construction and automation


Virtually Flash-Free

No need for secondary deflashing
High dimensional stability directly from mold
Flashless, wasteless design principles
Highest efficiency


Blind Sections

Through holes perfectly formed every time
Long tube sections reliably formed
Made possible with special tool construction


Highest Precision

Surfaces from high polish to textured
Consistent manufacturing over millions of parts


Under Cuts

Common feature in e.g. bellows
Made possible with LSR and special tool construction for molding and de-molding

YJC's Related Custom Technology of LSR Injection Molding

As a leading provider of LSR injection molding services, we are committed to delivering high-quality solutions. YJC Polymer Co,.Ltd has an ISO class 8 cleaning room with both single-shot and more than 12 sets LSR molding machines, where we also perform post-molding value-added processes. Our professional services include:

Mold Design and Manufacturing:

Utilizing advanced CAD/CAM software and manufacturing equipment, we design and fabricate precise molds to ensure part accuracy and quality.

Injection Molding:

LSR injection molding is the most common production process at YJC Polymer Co,Ltd. In this process, liquid silicone rubber material is heated and injected into the mold cavity using an injection molding machine, and then cured into solid silicone rubber products.

Two-Shot Injection Molding:

Two-shot injection molding is a special LSR injection molding process that allows injecting different colors of LSR materials into the same mold, resulting in composite parts with multiple colors.

Insert Molding:

Insert molding enables the integration of metal or other materials into the LSR mold during the injection process, fusing them with the LSR material to create composite parts.


Overmolding involves injecting LSR material into existing part cavities, covering or encapsulating the original part with LSR material to create composite products.

Coating Molding:

Coating molding is a process where LSR material is applied as a coating on existing substrates, providing enhanced or specialized properties to the base material.

Cast Molding:

Cast molding entails directly pouring liquid silicone rubber into the mold without using an injection molding machine, suitable for producing certain unique-shaped products.


This injection molding process produces tiny, complex parts, typically with a shot weight of less than 1 gram.

Hygienic molding:

LSR parts are produced in a clean, hygienic environment that are highly-controlled to various levels, such as white rooms or more stringent ISO cleanrooms with various classifications.

Through these different production processes, YJC's LSR molding technology can meet the diverse demands of various industries and applications, producing a variety of complex and specialized silicone rubber products

LSR Parts Production

We offers several options for LSR part production. We carefully evaluate each project to determine the best LSR injection molding technology for producing the components: LSR, LSR two-shot, LSR multi-shot, or LSR overmolding.

Our state-of-the-art facility is climate-controlled and exceptionally clean. Our production areas are clean and because our LSR, LSR 2k, multi-shot and overmolding manufacturing cells are fully-automated.



Each type of LSR material has its specific characteristics and suitable applications. Choosing the appropriate LSR material depends on the specific requirements and demands of the application.We provide customized LSR formulations to meet the performance requirements of specific applications.

Common types of LSR materials:

  • General-Purpose Silicone Rubber
  • Medical-Grade Silicone Rubber
  • High-Transparency Silicone Rubber
  • High-Temperature Resistant Silicone Rubber
  • Low-Temperature Resistant Silicone Rubber
  • Electrically Insulating Silicone Rubber
  • Food-Grade Silicone Rubber

Quality Inspections

Depending on your application's requirements, you can choose from the following when requesting a quote for your silicone rubber parts.

Quality Inspections available for on-demand manufacturing orders

Designing for Manufacturability (DFM) Feedback

Scientific Molding Process Development Report

In-process CMM inspection and machine monitoring

First article inspection (FAI) and process capability report with GD&T

Applications of LSR(Liquid Silicone Rubber) Injection Molding

LSR injection molding technology finds extensive applications across various industries, including but not limited to:

Medical Devices: Manufacturing medical silicone seals, tubes, artificial organs, and more.

Automotive Industry: Producing automotive seals, sound-dampening materials, cushioning pads, and more.

Electronics and Electrical: Creating electronic seals, electrical insulation components, conductive parts, and more.

Baby Products: Crafting safe and comfortable nipples, bottles, breastfeeding devices, and more.

Industrial Sector: Utilizing LSR for seals, protective covers, vibration damping pads, and more.

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