In the production and application of extruded silicone rubber, manufacturers often face a complex set of demands. Beyond the need for a crystal-clear aesthetic for high-end applications, products must maintain superior mechanical strength to withstand harsh operating conditions. Simultaneously, manufacturers must solve the persistent issues caused by filler moisture absorption—such as bubbling, processing defects, and accelerated aging.

To address these interconnected pain points, JSJ has leveraged its years of expertise in functional silica to launch BACOSIL® C251. Specifically engineered for extruded silicone rubber, this precipitated silica provides a high-performance solution characterized by “High Transparency + Strong Anti-Moisture Absorption + Superior Mechanical Properties.”

Image | Extruded Silicone Rubber Products

Core Advantages

1. Exceptional Transparency for High-End Aesthetics

While precipitated silica is traditionally associated with lower clarity, JSJ has redefined this standard through technical innovation. By precisely controlling particle morphology and dispersion characteristics, BACOSIL® C251 ensures:

• Ultrafine Dispersion: Particles are distributed uniformly within the silicone matrix at a microscopic level, minimizing light scattering at the source.

• Optical Clarity: Light transmits smoothly through the finished product, resulting in a clean, transparent texture that meets the aesthetic requirements of premium applications.

Image | BACOSIL® C251 Transparency Test

2. Advanced Moisture Resistance: Stability Throughout the Lifecycle

Moisture absorption is a critical factor impacting production efficiency and reliability. Damp fillers tend to clump, leading to poor dispersion, while moisture evaporation during processing causes bubbles and pinholes. BACOSIL® C251 offers a robust defense:

• Low Porosity Structure: With a moderate surface area and low porosity, it significantly reduces moisture adsorption channels.

• Consistent Processing: It maintains excellent flowability during storage and remains stable during compounding and vulcanization. This minimizes defects and significantly increases the yield rate.

• Long-term Reliability: In outdoor or humid environments, it delays hydrolytic aging, ensuring that the silicone rubber’s core functions—such as conductivity, light transmission, and insulation—remain reliable over time.

3. Superior Mechanical Reinforcement: Enhanced Durability

As a high-performance reinforcing filler, BACOSIL® C251 excels in strengthening the silicone matrix:

• Strong Molecular Bonding: Optimized surface activity allows the silica to form robust bonds with silicone molecular chains.

• Enhanced Toughness: It significantly improves the tensile strength, tear resistance, and abrasion resistance of extruded products.

• Extended Service Life: Products reinforced with BACOSIL® C251 resist deformation and damage under external stress or high-frequency friction, reducing maintenance costs and ensuring long-term performance.

Technical Support & Customization

JSJ believes that the best materials are those tailored to specific applications. In addition to the versatile BACOSIL® C251, we offer customized functional silica solutions based on our professional R&D and mass-production capabilities.

Customizable Parameters Include:

• Oil Absorption Value

• Specific Surface Area

• Particle Size Distribution (PSD)

Contact Us

If you are looking for a specialized silica solution that balances high transparency, mechanical strength, and moisture resistance, or if you require a bespoke formulation, please contact JSJ. Let’s work together to unlock the next level of product performance.

JSJ — Innovation to Solution.