Liquid Silicone Rubber

Understanding The Liquid Silicone Rubber (LSR)

Liquid silicone rubber (LSR) is a cutting-edge, two-component additive silicone rubber that truly sets itself apart. Unlike traditional semi-solid or single-component room-temperature vulcanized silicone rubbers, LSR offers distinct advantages. It boasts excellent fluidity, enables rapid vulcanization (curing), and is ideally suited for high-precision casting or injection molding processes. LSR comes in two primary types: self-adhesive and non-self-adhesive variants. Plus, it provides flexible curing options, able to cure at room temperature or, for incredibly fast production cycles, at high temperatures—often completing the curing process in mere seconds.

The Powerful Partnership: Fumed Silica in Silicone Rubbers

The real magic happens at the molecular level when fumed silica is introduced. The silicon hydroxyl groups (Si-OH) on fumed silica's surface readily form strong physical or chemical bonds with the silicone rubber macromolecules. This interaction creates a protective adsorption layer of silicone rubber molecules directly on the silica's surface, building a robust, three-dimensional network structure that links the silica particles with the silicone rubber molecules. This intricate network is crucial because it significantly limits the deformation of the silicone rubber molecular chains, delivering a powerful reinforcing effect that enhances the material's overall integrity and performance.

Key Advantages & Properties Enhanced by Fumed Silica

Incorporating fumed silica significantly elevates the performance of silicone rubbers, bringing a range of crucial benefits:

• Improved Reinforcement: Significantly boosts the strength and durability of silicone rubber products.

• Higher Hardness and Resilience: Leads to tougher, more elastic silicone products capable of withstanding greater stress.

• Enhanced Heat Resistance: Enables silicone rubber to perform reliably at higher temperatures without degradation.

• High Transparency or Clarity: Essential for applications where visual purity and aesthetic appeal are critical.

• Excellent Aging Resistance: Ensures long-term performance and stability, extending product lifespan.

• Effective Thickening & Thixotropic Agent: Controls viscosity and flow properties, making materials easier to process and apply consistently.

Explore Our Recommended Fumed Silica Grades for Your Applications: HJSIL 200 | HJSIL 300 | HJSIL 380 | HJSIL R620