Silico® Liquid Silicone Rubber (LSR)
Silico® Liquid Silicone Rubber (LSR) is a two-part, high-purity, low-viscosity silicone elastomer specifically engineered for liquid injection molding (LIM) applications. LSR exhibits outstanding thermal stability, weather resistance, electrical insulation, and biocompatibility, making it ideal for a wide range of demanding industries including medical, infant care, food contact, electronics, and automotive manufacturing.
Compared with traditional High Temperature Vulcanized (HTV) silicone rubber, LSR enables fully automated, high-speed processing, allowing for the production of intricate, precision-molded components with high efficiency and reduced labor costs.
Liquid Silicone Rubber (LSR) Products
Types of Liquid Silicone Rubber (LSR) Offered by Silico®
Product Type | Key Features | Typical Applications |
---|---|---|
Industrial Grade LSR | Excellent thermal stability, high tear strength, dimensional accuracy | Gaskets, cable boots, O-rings, industrial seals |
Medical Grade LSR | USP Class VI & ISO 10993 certified, low volatility, biocompatible | Catheters, syringes, ventilator components, pacifiers |
Food Grade LSR | FDA & LFGB compliant, odorless, non-toxic | Kitchenware, bottle nipples, baking molds, seals |
High Transparency LSR | Superior optical clarity, consistent color, anti-yellowing | LED lenses, transparent keys, lighting gaskets |
Self-Adhesive LSR | Bonds to PC, PBT, PA without primer, suitable for two-shot molding | Automotive buttons, overmolded electronics |
Key Performance Advantages of LSR
Thermal Stability: Continuous use up to 200 °C, short-term up to 250 °C+
Low-Temperature Flexibility: Maintains elasticity down to –50 °C
Biocompatibility: Safe for skin contact and long-term medical use
Electrical Insulation: Excellent dielectric properties for electronics
Superior Processability: High flow, fast curing, supports flash-free molding and automated demolding
Target Application Industries
Silico® LSR materials are trusted across a broad spectrum of high-performance markets:
Healthcare & Medical Devices: Catheters, seals, ventilator parts, skin-contact wearables
Infant & Baby Care: Nipples, teethers, feeding tools, medical-grade pacifiers
Food Contact Products: Molds, cookware, bottle caps, high-heat resistant kitchen accessories
Automotive Components: Ignition seals, gaskets, sensor housings, keypads
Electronics & Lighting: LED lenses, optical gaskets, waterproof seals, connector housings
Contact Us | Get Samples and Technical Support
Silico® offers free sample evaluation, datasheets (TDS, MSDS), and process recommendations for LSR molding. Reach out to our silicone specialists for tailored solutions and product selection advice.
📩 Email: info@silicorex.com
Silico® — Your Trusted Partner for High-Performance Liquid Silicone Rubber
Liquid Silicone Rubber (LSR) FAQs
A: Silico® LSR is cured via platinum-catalyzed addition (hydrosilylation) reaction, which is fast, clean, and does not generate volatile by-products. This enables shorter cycle times, flash-free molding, and ensures excellent thermal and mechanical stability. Unlike peroxide-cured systems, no post-curing is needed for most applications.
A: Silico® LSR exhibits Newtonian flow characteristics, meaning its viscosity remains constant regardless of shear rate. This ensures uniform cavity filling, minimizes internal stresses, and enables precise replication of micro-features, which is especially critical for thin-walled or high-precision parts.
A: Silico® SA Series is formulated for direct bonding to thermoplastics such as PC, PBT, and PA without primer. It achieves chemical adhesion through controlled interfacial reactions during co-injection, provided that appropriate surface energy, mold temperature (≥150 °C), and cycle time are maintained.
A: Yes. Silico® offers high-transparency LSR with:
Light transmittance >90% (2 mm thickness)
Low haze and minimal birefringence
Refractive index ~1.41
Excellent UV resistance and thermal aging performance
These properties make it ideal for LED lenses, light guides, and encapsulants.
A: Silico® LSR grades are available with certifications including:
USP Class VI, ISO 10993-5/10/11 for medical applications
FDA 21 CFR 177.2600, LFGB, EU 10/2011 for food contact
RoHS, REACH, halogen-free, and BPA-free compliance
Test reports and declarations can be provided upon request.
A: Yes. Silico® provides custom-engineered LSR compounds tailored to specific functional needs, such as:
Thermally conductive grades (up to 2.5 W/m·K) for electronics
Electrically conductive LSR for EMI/RFI shielding
Flame-retardant systems (UL 94 V-0 compliant)
Low-volatile, low-friction, or fast-cure formulations
Our R&D team supports joint development projects for advanced applications.
Packaging Specifications

Silico® Prouducts
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How to Choose Liquid Silicone Rubber (LSR)?
RTV-1: Single-part, moisture-cure — easy for sealing & bonding
RTV-2: Two-part, mix & cure — ideal for molding & encapsulation
High Temp: Choose for applications up to 300°C
Food Grade: For FDA/EU compliant food or medical use
Conductive: For EMI shielding in electronics
Oil Resistant: Needed for automotive & aerospace sealing