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

Industrial Grade LSR Silicone Rubber

Silico® Industrial LSR is a two-part, platinum-cured silicone for injection molding. It offers excellent heat resistance, strength, fast curing, and is ideal for automotive, seals, and electronics.

Medical Grade LSR Silicone Rubber

Silico® Medical LSR is a platinum-cured silicone with high purity and biocompatibility, ideal for molding medical devices like drug delivery, diagnostics, and surgical components.

Food Grade LSR Silicone Rubber

Silico® Food Grade LSR is a platinum-cured, high-purity silicone ideal for food contact. It’s heat-resistant, odorless, and FDA/LFGB compliant—perfect for kitchenware and beverage systems.

High Transparency LSR Silicone Rubber

Silico® High Transparency LSR is a platinum-cured, ultra-clear silicone with ≥94% transmittance, ideal for optical lenses, LEDs, wearables, and medical optics via precision LIM molding.

Self-Adhesive LSR Silicone Rubber

Silico® Self-Adhesive LSR is a primerless, platinum-cured silicone for direct overmolding on plastics and metals. It offers fast curing, strong bonding, and excellent durability for high-volume LIM.

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

Q1: What is the curing mechanism of Silico® LSR and how does it impact processing?

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.

Q2: How does the rheology of Silico® LSR affect flow behavior in complex mold geometries?

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.

Q3: What are the adhesion capabilities of Silico® self-adhesive LSR grades in two-component molding?

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.

Q4: Is Silico® LSR suitable for optical or lighting applications? What are the key parameters?

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.

Q5: What are the regulatory and safety standards Silico® LSR complies with?

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.

Q6: Can Silico® LSR be customized for specialized applications such as thermal management or EMI shielding?

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.