Liquid silicone rubber is undergoing a role transition from "structural component material" to "functional material." The emergence of conductive medical-grade LSR has opened up new material selection possibilities for smart wearable devices, flexible electronic devices, and high-end sensors.

Demand for Conductive Materials in Smart Wearable Devices

Wearable health monitoring devices need to transmit bioelectrical signals (such as ECG and EMG) from the skin surface to signal processing circuits. Traditional solutions use metal electrodes or conductive gels, but metal electrodes have limited conformity to the skin, and conductive gels suffer from failure after drying out. Conductive silicone rubber combines flexibility and conductivity, enabling stable signal transmission while ensuring comfortable wear.

Our company has launched a new medical-grade conductive liquid silicone rubber with a resistivity below 10 ohm-cm, enabling efficient conductivity in wearable devices, flexible electronic devices, and high-end sensors. The product's liquid injection molding characteristics can support complex designs, and the material's durability and flexibility ensure stable performance over the long term under demanding conditions.

Biocompatibility: The Entry Threshold for Medical-Grade Conductive LSR

For applications involving direct contact with human skin, biocompatibility is the core entry threshold for conductive LSR. This product has passed ISO 10993-5 cytotoxicity testing and ISO 10993-10 skin sensitization testing, with results showing high compatibility with prosthetics, diagnostic tools, and next-generation flexible circuits.

This means the material can be safely used in scenarios involving short-term or long-term contact with the human body, providing a compliance foundation for smart wearable device manufacturers. Currently, the product has achieved commercial application and is compatible with precision liquid silicone rubber injection molding solutions, allowing manufacturers to fine-tune parameters directly in the mold to enhance production controllability and efficiency.

Application Scenarios and Material Selection Key Points

Typical applications of conductive LSR in the smart wearable sector include: flexible electrodes for wearable ECG/EMG monitoring devices, pressure sensing layers, stretchable conductive traces, and signal transmission components in smart clothing.

For technical personnel at product manufacturing companies, the following key points should be considered when selecting conductive LSR:

• Resistivity and stability: Beyond initial resistivity specifications, it is also necessary to evaluate the rate of resistance change under repeated deformation (stretching, bending) to ensure stable signal transmission.

• Hardness and skin conformity: Electrode components in contact with skin typically require lower hardness (e.g., Shore A 30–50) to enhance wearing comfort.

• Processing compatibility: The addition of conductive fillers alters the rheological properties of LSR, requiring re-validation of injection molding process parameters (injection pressure, speed, mold temperature).

• Sterilization compatibility: If used in medical scenarios, the material's resistance to common sterilization methods (such as ethylene oxide and gamma radiation) must be confirmed.

More information, please click here.