Wevo’s LSR silicone seals EV batteries to China’s 2026 standard
Category: Adhesives & Bonding, Batteries, Components & Technology, Materials, Materials & Manufacturing, Policy & Market, Regulation & Policy
WEVOSIL 23130 LSR applied via automated dispensing to an EV battery housing – Wevo’s solution for GB 38031-2025 thermal runaway sealing compliance
(Image courtesy of WEVO-CHEMIE)
China’s GB 38031-2025 battery safety standard takes effect in July 2026, raising the bar for EV battery housing sealing across the global supply chain. The regulation requires high-voltage battery systems to protect passengers and emergency responders more effectively during thermal runaway events. WEVO-CHEMIE GmbH, based in Ostfildern-Kemnat, Germany, has developed WEVOSIL 23130 to address this directly. The liquid silicone rubber targets the formed-in-place gasket (FIPG) sealing systems that sit at the centre of the new compliance challenge.
EV battery housing sealing under greater pressure
When thermal runaway occurs in a high-voltage battery, the housing must contain corrosive gases, extreme heat, and rapid pressure build-up simultaneously. The battery housing sealing system sits at the interface of all three, making material performance at this junction safety-critical. Wevo’s WEVOSIL 23130 forms a reliable gas-tight barrier, with thermal and chemical stability matched to the conditions that China’s standard now mandates.
The FIPG process gives manufacturers an advantage over cured-in-place gasket (CIPG) approaches. Chemical adhesion on both sides of the seal creates a significantly more robust bond between the silicone and the standard substrates used in battery housings and cable glands. Adhesive strength exceeds 2 MPa, and the material also provides effective moisture ingression prevention.
Automated production demands drive sealing material choices
EV battery housing sealing materials must perform in high-throughput, automated production environments, not just under field conditions. WEVOSIL 23130’s filler-free formulation gives it precise rheological properties compatible with standard mixing, dosing, and static mixer systems. It handles complex 3D geometries with consistent accuracy.
Pot life exceeds 24 hours at room temperature, allowing manufacturers to seal large battery housings without disruption from production downtime. Localised IR heating to 140°C then triggers initial cure in under five minutes. That combination of processing flexibility and rapid cure makes the material well suited to the cycle-time demands of high-volume battery production.
Wevo’s broader role in high-voltage battery systems
WEVOSIL 23130 sits within a wider RTV-2 silicone portfolio that Wevo has developed for the high-voltage battery market. The range includes potting compounds for thermal management of battery components, structural adhesives for mechanically stable bonds between battery cells and housing, gap fillers for thermal decoupling and runaway mitigation, and silicone gels for protecting electronic assemblies. Battery producers facing GB 38031-2025 compliance timelines now have access to a material set covering thermal management, cell chemistry protection, and structural integrity within a single supplier’s portfolio.
With the July 2026 implementation deadline firm for all newly type-approved vehicles in China, battery manufacturers face mounting pressure to qualify sealing systems that satisfy both the new safety requirements and the demands of automated production at scale.
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