Liquid Silicone Foam Empowers Lightweight Thermal Insulation

Driven by the rapid growth of electric vehicles, energy storage systems and charging infrastructure, the market for lightweight thermal insulation and cushioning materials has expanded steadily. Battery modules, packs and cabinets require materials that insulate heat, absorb vibration, seal gaps and reduce weight — all while meeting increasingly strict safety standards. As battery energy density rises and pack structures become more compact, designers increasingly adopt high-expansion foam materials for cell cushioning, module insulation and pack sealing. Battery manufacturers and system integrators have raised higher standards on material weight, flame retardancy, long-term compression stability and temperature resistance. As a core protection material, liquid silicone foam from Hong Ye Silicone gains increasing importance in the new energy supply chain.

Battery pack production has special working conditions. Cells generate heat during charging and discharging, and packs must withstand vibration, impact and alternating hot and cold cycles over years of service. Conventional polyurethane and EVA foams absorb moisture, compress permanently and lose their cushioning and insulation performance, while their limited temperature range and flammability raise safety concerns in thermal runaway scenarios. In addition, battery modules span large dimensions and complex structures. Poor shrinkage control of foam materials will cause dimensional deviation and assembly tolerance problems, and frequent material replacement significantly increases cost and working hours for pack manufacturers.

Liquid silicone foam from Hong Ye Silicone is a platinum-cured two-component addition curing silicone rubber with a formula optimized for battery protection applications. With a high expansion ratio of 2 times nominal and up to 7 times maximum, the material reduces weight and raw material consumption while maintaining reliable thermal insulation and cushioning. After mixing and foaming, it forms a uniform closed-cell structure with low linear shrinkage, ensuring stable dimensions after curing. Mass-produced cushioning pads, insulation layers and sealing strips maintain consistent size, reducing later assembly adjustment and ensuring precision on the production line.

In terms of mechanical performance, this foamed silicone delivers high rebound resilience and low compression set. Battery packs undergo repeated vibration and compression during transport and service, and molds or pads need to recover their shape after every cycle. The high-rebound formula effectively prevents permanent deformation and performance loss. The cured foam also offers inherent flame retardancy, chemical inertness and moisture resistance. After long-term contact with electrolytes, humidity and alternating hot and cold conditions, it resists aging, degradation and performance decay. One piece of foam can serve for years, greatly reducing replacement cost and improving delivery efficiency for battery manufacturers.

For production adaptability, this liquid silicone foam supports two mainstream processes: mold casting and automated dispensing. For complex module structures and large insulation layers, mold casting is widely adopted. Mixed material is poured or injected into the cavity, foams and cures at ambient or elevated temperature, and demolds as a finished cushioning or sealing component. Simple and medium-sized parts can adopt continuous dispensing, where the two components are metered, mixed and applied directly onto the battery structure. The simple 1:1 mixing ratio and stable foaming behavior eliminate complex equipment adjustments. It can be applied by small processing workshops as well as large automated battery production bases.

Industry trends show the global new energy sector is moving toward higher safety and lighter weight. Custom battery protection orders from electric vehicle, energy storage and charging infrastructure projects keep rising. Packs become more compact and structures more complex. Downstream manufacturers focus not only on raw material price, but also on comprehensive indicators including flame rating, compression set, long-term stability and process compatibility. Hong Ye Silicone keeps optimizing formulas, launching liquid silicone foam grades with different densities, hardness and pot life for applications ranging from thin cushioning pads to thick insulation layers. Test documents are continuously upgraded to satisfy environmental compliance requirements of domestic and overseas projects.

Industry insiders state that the final protection effect of battery packs fundamentally depends on material quality. High-performance liquid silicone foam from Hong Ye Silicone helps convert complex cushioning, insulation and sealing designs from engineering drawings into mass-producible protection components, lowering manufacturing barriers for sophisticated battery structures. In the future, with the continuous advancement of electric vehicles, grid-scale energy storage and fast-charging infrastructure, the market for foamed silicone protection materials will expand further. Foam material technology will keep upgrading to support the new energy industry in delivering safer, lighter and longer-lasting battery systems.