When silicone products, such as earbud tips, watch straps, or baby bottle nipples, are stretched, they often turn pale or white, reverting to their original color within seconds. This stress whitening not only impacts aesthetics but also indicates material fatigue.
JSJ, a leading provider of functional silica solutions, introduces its innovative precipitated silica for silicone rubber, designed for high-end consumer electronics, wearable devices, mother-and-baby products, and daily essentials. Our breakthrough “Stress Whitening Rapid Recovery” technology enables silicone rubber to recover instantly, retaining clarity and resilience even after repeated deformation. 
JSJ’s Stress Whitening Rapid Recovery Precipitated Silica
Superior Fatigue Resistance and Structural Stability
JSJ’s advanced precipitated silica is engineered with precise control over particle size distribution, surface activity, and structural properties, creating a robust reinforcement network within the silicone rubber matrix.
Image: JSJ Silicone Rubber Laboratory
This technology ensures uniform particle dispersion, forming optimal physical adsorption and chemical bonding with silicone rubber molecular chains. During stretching, silica particles distribute stress, minimizing excessive chain stretching or breakage. Upon stress release, the stable network rapidly restores its molecular chains, thereby reducing the whitening duration. This enhances fatigue resistance and structural stability, ensuring long-term performance in demanding applications.
Image: Silicone Rubber Tear Strength Test
Rapid Recovery to Original State
Whitening Fades in 1-2 Seconds
Products made with JSJ’s precipitated silica recover from stress whitening in just 1-2 seconds. This meets the rigorous safety and reliability requirements of mother and baby products and precision components while ensuring aesthetic consistency and user experience in wearable technology and daily essentials under frequent use.
See the difference in action:
Image: Comparison of Silicone Rubber Samples Under Stretch
A standard sample shows significant whitening during stretching, with marks lingering long after release, resembling permanent damage. In contrast, a sample made with JSJ’s precipitated silica exhibits whitening during stretch but recovers within 1-2 seconds, restoring its uniform color and clarity. This demonstrates superior molecular stability and fatigue resistance, ensuring long-term reliability in wearable devices, industrial applications, and more.
Applications
Transparent and High-Temperature Vulcanized Silicone Rubber
JSJ’s precipitated silica is ideal for transparent and semi-transparent high-temperature vulcanized silicone rubber, as well as general-purpose silicone rubber products requiring rapid recovery. Key applications include:
Wearable Products: Rubber watch straps and fitness bands resist whitening from daily bending, maintaining aesthetics and durability.
Mother and Baby Products: Pacifiers and teething toys recover quickly after biting or pulling, ensuring safety and extended lifespan.
Industrial Components: Seals for hydraulic equipment and waterproof connectors maintain performance under repeated stretching, reducing leakage risks and enhancing reliability.
About JSJ
Established in 2003 and publicly listed in 2021, JSJ is a trusted provider of functional silica solutions. Driven by customer needs and innovation, we offer standardized products and customized solutions tailored to your requirements.
When your products face extreme conditions or demand industry-leading performance, JSJ’s precipitated silica is your reliable partner.
Interested in our Stress Whitening Rapid Recovery precipitated silica or other silicone rubber solutions? Contact us today to request samples and tailored technical support.
