High Elongation Large Stretch Bionic Skin Silicone For Large Motion Humanoid Robots

High elongation large stretch bionic skin silicone is a long-chain modified platinum-cured RTV-2 liquid bionic silicone developed by Shenzhen Hong Ye Jie Technology for high-degree-of-freedom dynamic humanoid robots. As humanoid robots evolve from static display to dynamic performance and large-range limb interaction, dance robots and full-body motion bionic prototypes perform large-angle rotation and extensive stretching on joints such as neck, shoulder, elbow and hip. Conventional bionic silicone has relatively short molecular chains and limited breaking elongation. When epidermal stretching reaches material limit during joint movement, microcracks and whitening appear, and skin tears after repeated large deformation. Once skin cracks, realistic appearance is destroyed and internal mechanical structure gets exposed, which leads to frequent skin replacement and high maintenance cost. Even if some silicone does not break under stretching, replicated pores and fine texture on skin surface will fracture and lose simulation effect.

This high elongation large stretch bionic silicone adopts long-chain molecular modification to improve molecular chain slippage and entanglement strength, delivering ultra-high breaking elongation. The material does not crack under extreme large deformation, and surface bionic texture stays intact without whitening or tearing during stretching. When joints twist greatly and limbs stretch to limit position, silicone stretches and retracts synchronously with mechanical structure without irreversible microcracks. It follows standard 1:1 weight mixing ratio and cures at room temperature, heating is available to accelerate production. Both pouring and brushing processes are supported for integrated molding of neck, shoulder, elbow, hip and other large joint skins. Hardness ranges from 2A to 15A. 2A‑7A ultra-soft high elongation grade fits flexible large deformation areas like neck and cheek, with soft fit and smooth stretching. 8A‑15A grade is suitable for thick skin of shoulder, hip and arm joints, balancing structural support and super stretching performance.

Core advantages: ultra-high breaking elongation, no cracking under large deformation, compatible with large joint torsion and stretching, texture remains intact during stretching, skin stays undamaged in dynamic large deformation scenarios. Traditional bionic silicone focuses on static simulation texture and only supports slight facial micro-expression and minor joint movement, unable to handle extreme dynamic working conditions like dancing and wide limb swing, leading to frequent skin tearing and scrapping during prototype testing. This high-elongation silicone is specially designed for high-degree-of-freedom dynamic robots. It keeps skin integrity and texture even under extreme stretching, combining dynamic motion performance and realistic bionic simulation. With ultra-low curing shrinkage, it precisely replicates human skin pores and fine lines. Texture will recover quickly after deformation even under large stretching.

The formula features excellent dynamic fatigue resistance. No molecular chain relaxation or skin embrittlement after tens of thousands of repeated large stretching cycles. Platinum eco-friendly system is non-toxic and odorless, safe for human contact. The silicone has moderate fluidity and great defoaming performance. Large-area joint skin has few bubbles and uniform color. Batch stretching performance is stable for small prototype sampling and mass production of dynamic performance robot projects.

Shenzhen Hong Ye Jie Technology maintains a full differentiated bionic silicone portfolio covering self-healing, hydrolysis-resistant, high-tear-strength, low-shrinkage precision molding, high-resilience anti-deformation, matte anti-fingerprint, zero-bleed clean-grade, low-odor low-VOC, antibacterial hygienic, weathering anti-aging, anti-static low dust accumulation, sensor-compatible flexible substrate and this new high elongation large stretch series. Customization for hardness, skin tone and tensile performance is available. Mechanical tensile test reports and sample evaluation can be provided to help dynamic high-degree-of-freedom humanoid robots solve joint tearing issues and cut skin replacement cost.

Main Features

1. Ultra-high breaking elongation via long-chain modified molecular structure, hard to break under extreme large deformation
2. Texture retention under large deformation, no whitening and no tearing of simulated skin texture when stretched greatly
3. Adaptable for large-angle joint torsion, fits wide limb movement of shoulder neck elbow hip multi-degree joints
4. Excellent dynamic fatigue resistance, low performance attenuation after tens of thousands of repeated large stretch cycles, hard to embrittle
5. Stable bionic texture, low shrinkage replicates skin pores and fine lines, texture recovers quickly after stretch and rebound
6. Good molding compatibility, supports pouring and brushing molding for large-area joint skin
7. Platinum eco-friendly formula, non-toxic and odorless, safe for close human robot touch interaction
8. Stable batch mechanical performance, tensile indicators inspected per batch, suitable for prototype and mass projects

Operating Instructions Stir Part A and Part B separately for more than 3 minutes before use. Mix strictly at 1:1 weight ratio and fully stir for 2‑3 minutes while scraping bottom and wall. Carry out sufficient vacuum defoaming after mixing to reduce bubble defects. Room temperature pot life is 40‑50 minutes; full curing takes 6‑10 hours at room temperature. Heat at 50‑70℃ to accelerate curing without damaging high stretch property. Adjust skin thickness according to deformation requirement for large joint skin, and complete reciprocating stretch fatigue test on samples before formal application.

Notes Platinum cured silicone must avoid contamination of sulfur, tin, lead and phosphorus substances, which may cause curing failure and reduce tensile mechanical performance. Keep mixing containers and molds clean and dry. Conduct reciprocating large-angle stretch fatigue test on samples before mass production to verify working condition adaptability. Avoid continuous over-limit stretching of finished skin to extend service life. Prevent finished products from long-term strong ultraviolet radiation.

Packing & Storage Part A and Part B are separately sealed in drums: 5KG, 20KG, 200KG. Store in cool dry and ventilated warehouse away from high temperature heat source. Sealed shelf life is 12 months. Non hazardous goods, regular logistics available.