The rapid increase in new energy vehicle (NEV) penetration is generating a structural demand for high-performance liquid silicone rubber (LSR). Among its various applications, sealing high-voltage connectors represents one of the most technologically demanding and value-driven segments for LSR in the NEV sector.

Technical Demand Background

As NEVs evolve toward 800V high-voltage platforms, high-voltage connectors face significantly elevated requirements for long-term waterproofing, heat resistance, and aging resistance in sealing materials. Traditional rubber materials tend to accelerate aging and lose sealing elasticity under high-voltage, high-current operating conditions. Silicone rubber, with its wide-temperature-range stability (-60°C to 200°C) and excellent aging resistance, has become the mainstream material choice for high-voltage connector sealing .

Product Solutions and Industry Recognition

To address this application challenge, Elkem Silicones launched the BLUESIL™ LSR 3935 series specifically designed to meet sealing requirements for high-voltage connectors, which received the "Ringier Technology Innovation Award" recognition . The core advantages of this product series include surface self-lubrication, ultra-low compression set, and excellent thermal stability, with hardness covering Shore A 20 to 60 to accommodate diverse design and assembly requirements . Dow Chemical's recent LSR expansion plan similarly identifies "transportation" as one of three key service areas, encompassing automotive intelligence modules and advanced safety systems, with manufacturing base expansion projects in Zhangjiagang, China and Carrollton, Kentucky expected to begin production by 2027 .

Market Growth Potential

According to Fortune Business Insights, the automotive and transportation sector is projected to grow at a CAGR of approximately 6.2% during 2026–2034 . Considering that LSR usage per NEV is significantly higher than per conventional internal combustion engine vehicle—with an average NEV using 200–500g of LSR materials—and that application scenarios such as high-voltage connectors, battery pack sealing, and thermal management systems continue to expand, LSR demand growth in the NEV sector is expected to outpace the industry average .

Implications for Downstream Enterprises

For manufacturers engaged in automotive rubber and plastic component production, high-voltage connector seals represent an important entry point into the NEV supply chain. LSR applications in this field feature high technical barriers, long customer validation cycles, and stable supply relationships once designated, making it a high-value-added segment worthy of deep cultivation.

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