Dow introduces high-temperature silicone gel to boost efficiency in EV power electronics

Dow has launched DOWSIL EG-4175 Silicone Gel, a protective material designed to support next-generation insulated gate bipolar transistor (IGBT) modules operating at higher voltages. This new gel withstands temperatures up to 180°C and is targeted at power electronics in electric vehicle batteries and main inverters, as well as inverters used in photovoltaic panels and wind turbines.

According to Dow, DOWSIL EG-4175 Silicone Gel is formulated to handle the elevated temperatures found in seventh-generation IGBT modules as battery voltages in EVs increase from 400 V to 800 V to improve inverter performance and enable faster charging. The gel is engineered for enhanced dielectric strength and thermal resistance, supporting higher power densities and enabling the handling of greater electrical loads.

The gel features self-healing properties to repair small cracks, vibration absorption, and self-priming adhesion to protect delicate electronics. It cures at room temperature for energy-efficient manufacturing, but the process can be accelerated with heat to reduce production cycle times. Dow also notes that this gel exhibits low levels of silicone oil bleed and adheres to substrates without the need for a primer.

The product builds on Dow’s existing portfolio of silicone-based dielectric gels that offer electrical insulation, encapsulation, mechanical stress relief, and environmental protection. DOWSIL EG-4175 Silicone Gel is complemented by DOWSIL EA-7158 Adhesive—also formulated for IGBT modules—which offers one-part, high-strength performance, rapid heat curing and translucent color for easier inspection.

“Dow is upgrading our IGBT materials portfolio to address the emerging trend toward achieving higher power densities,” said Cathy Chu, global strategic marketing director, Consumer and Electronics, Dow. “With its higher-temperature resistance compared to incumbent materials, this new silicone gel will enable our customers to design and manufacture higher-density IGBT modules with greater power system efficiency.”

Both silicone-based products for IGBT modules are now available globally, according to Dow.

Source: Dow