Top 10 Companies in the Thermal Gap Filler Boron Nitride Filled Silicone EV Module Market (2026): Market Leaders Powering Global EV Thermal Management

MARKET INSIGHTS

The Thermal Gap Filler Boron Nitride Filled Silicone EV Module Market was valued at USD 285 million in 2025. The sector is projected to rise from USD 312 million in 2026 to USD 685 million by 2034, reflecting a CAGR of 10.3 % over the forecast horizon.

These advanced thermal interface solutions combine flexible silicone polymers with high‑purity boron nitride particles, delivering superior thermal conductivity while preserving electrical insulation. By filling microscopic gaps between heat‑generating cells and cooling plates, they enable efficient heat dissipation that is essential for battery performance, longevity, and safety under demanding EV operating conditions.

The expansion of the market is tightly linked to the global push for electric vehicles and the growing complexity of battery thermal management systems. Manufacturers seeking higher energy densities and faster charging are demanding materials that can reliably manage heat without risking thermal runaway. Recent formulation advances have improved dispensability and long‑term stability under thermal cycling and vibration, allowing broader integration across automotive platforms.

Key industry players are actively developing next‑generation products for cell‑to‑pack and structural battery designs, while supportive government policies for EV infrastructure reinforce the upward trajectory.

PRODUCT DEFINITION

Thermal gap fillers are silicone‑based matrices loaded with boron nitride particles. The hybrid composition offers a unique blend of high thermal conductivity, electrical insulation, and mechanical flexibility. The fillers are applied as pastes, gels, or two‑part systems, curing in situ to seal micro‑gaps and establish continuous heat paths between battery cells and cooling structures.

Top 10 Companies in the Thermal Gap Filler Boron Nitride Filled Silicone EV Module Market (2026)

10️⃣ 1. Dow, Inc.

Headquarters: Midland, USA
Key Offering: High‑load‑bearing BN‑filled silicone grades for EV battery packs

Dow’s portfolio of silicone formulations is engineered to meet the stringent voltage‑hold and thermal conductivity requirements of modern EV batteries. The company’s R&D focus on particle dispersion and curing chemistry ensures consistent performance across varying cell chemistries.

In 2025, Dow announced a partnership with a leading battery pack integrator to test a new two‑part silicone system that reduces voids and improves thermal contact.

• Invests USD 150 million in R&D for next‑generation BN fillers.
• Expands manufacturing footprint in Asia‑Pacific to support rising EV production.
• Targets 30 % reduction in material cost through process optimization.

9️⃣ 2. Wacker Chemie AG

Headquarters: Munich, Germany
Key Offering: Silicone gels with engineered BN particle dispersion

Wacker’s gels are tailored for high‑temperature environments, offering excellent dielectric properties and mechanical resilience. The company’s precision dispersion technology mitigates agglomeration, a common challenge in high‑filler loadings.

Wacker recently secured a supply agreement with a Tier‑1 OEM to supply silicone gels for a 800 V EV platform.

• Develops nano‑engineered BN coatings to enhance thermal paths.
• Focuses on sustainability by reducing VOC emissions in gel formulations.
• Collaborates with academic partners on next‑generation filler surface treatments.

8️⃣ 3. Momentive Performance Materials

Headquarters: Westlake, USA
Key Offering: Broad spectrum of BN‑filled silicone grades for high‑temperature applications

Momentive’s extensive patent portfolio underpins its leadership in high‑temperature thermal management. The company’s formulations maintain flexibility while delivering exceptional thermal conductivity.

In 2025, Momentive announced a joint venture to develop a hybrid filler combining BN with graphene for ultra‑high conductivity.

• Invests in scalable manufacturing to meet Asia‑Pacific demand.
• Explores bio‑based silicone backbones to reduce carbon footprint.
• Partners with battery suppliers to integrate fillers into cell‑to‑pack assemblies.

7️⃣ 4. 3M Company

Headquarters: St. Paul, USA
Key Offering: Electrically insulating gap fillers combining BN with silicone elastomers

3M’s line of gap fillers is designed for compact EV module architectures, offering superior dielectric strength and mechanical resilience.

The company has introduced a low‑viscosity formulation that accelerates dispensing in automated production lines.

• Invests in additive manufacturing techniques for custom filler shapes.
• Supports circular economy by developing recyclable silicone composites.
• Engages with OEMs to validate performance in high‑power charging scenarios.

6️⃣ 5. Henkel AG & Co. KGaA

Headquarters: Düsseldorf, Germany
Key Offering: Low‑viscosity BN‑filled silicone for fast‑assembly battery pack integrators

Henkel’s formulation delivers high filler loadings while maintaining a flowable consistency that fits automated dispensing equipment.

The company recently launched a product line aimed at Tier‑2 battery pack integrators, emphasizing rapid cure times.

• Focuses on reducing energy consumption in curing processes.
• Collaborates with suppliers to optimize particle size distribution.
• Invests in training programs for assembly line operators.

5️⃣ 6. Shin‑Etsu Chemical Co., Ltd.

Headquarters: Tokyo, Japan
Key Offering: BN surface‑treated fillers with enhanced dispersion for high‑performance EV modules

Shin‑Etsu’s surface‑treated BN particles improve interfacial bonding within silicone matrices, boosting thermal pathways and mechanical integrity.

In 2025, the company announced a new coating process that increases filler surface area by 15 %, translating to higher thermal conductivity.

• Invests in nano‑coating technologies to further elevate performance.
• Engages in joint research with automotive OEMs on battery pack integration.
• Explores partnerships for local production in emerging EV markets.

4️⃣ 7. Laird Performance Materials

Headquarters: Slough, UK
Key Offering: High‑temperature BN‑filled silicone for power electronics cooling

Laird’s formulations are engineered to withstand the heat fluxes encountered in high‑power electronics modules.

The company has recently secured a contract to supply fillers for a commercial EV battery pack manufacturer in the Middle East.

• Develops hybrid fillers combining BN with ceramic nanoparticles.
• Focuses on low‑VOC formulations to meet regulatory standards.
• Invests in local production facilities to reduce lead times.

3️⃣ 8. Trelleborg AB

Headquarters: Stockholm, Sweden
Key Offering: Silicone gels with engineered BN loadings for structural battery designs

Trelleborg’s gels provide robust mechanical support while maintaining high thermal conductivity, ideal for structural battery packs that combine cell and cooling plate in a single unit.

The company announced a new product line in 2025 that reduces filler loading by 10 % while preserving conductivity, lowering material costs.

• Invests in advanced curing technologies to reduce energy consumption.
• Explores recyclable silicone backbones for end‑of‑life sustainability.
• Collaborates with OEMs on modular battery pack architecture.

2️⃣ 9. Silicone Solutions, Inc.

Headquarters: Irvine, USA
Key Offering: Customizable BN‑filled silicone formulations for niche EV applications

Silicone Solutions offers a flexible platform that allows OEMs to tailor filler loadings and curing times to specific vehicle architectures.

The company has recently introduced a low‑temperature cure system that reduces production cycle times by 20 %.

• Invests in R&D for bio‑based silicone backbones.
• Partners with battery pack integrators on performance validation.
• Expands distribution in emerging markets through strategic alliances.

1️⃣ 10. Polyglass Group

Headquarters: Newark, USA
Key Offering: High‑strength BN‑filled silicone for demanding thermal management scenarios

Polyglass’s formulations are designed for high‑temperature, high‑pressure environments, delivering exceptional mechanical resilience alongside thermal performance.

The company announced a new line in 2025 that integrates BN with carbon fibers to further enhance heat dissipation.

• Invests in advanced composite manufacturing techniques.
• Focuses on reducing the carbon footprint of production processes.
• Engages with OEMs to integrate fillers into structural battery modules.

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Outlook

From 2026 to 2034, the market is expected to grow from USD 312 million to USD 685 million, driven by the rapid adoption of electric vehicles and the escalating need for reliable thermal management solutions. The expansion is underpinned by ongoing R&D into hybrid fillers and sustainable formulations that reduce cost and environmental impact.

Future Trends

Key emerging directions include: nano‑enhanced boron nitride fillers that deliver higher thermal conductivity; direct integration of silicone composites into battery pack structures to streamline assembly; and a shift toward recyclable, low‑VOC thermal interface materials to satisfy tightening environmental regulations. These trends are likely to reshape the competitive landscape, encouraging incumbents to accelerate product innovation and expand localized manufacturing.

Frequently Asked Questions

What is the current market size of the Thermal Gap Filler Boron Nitride Filled Silicone EV Module Market?

USD 312 million in 2026, projected to reach USD 685 million by 2034.

Which key companies operate in this market?

Dow, Wacker, Momentive, 3M, Henkel, Shin‑Etsu, Laird, Trelleborg, Silicone Solutions, and Polyglass.

What are the main growth drivers?

Accelerated EV adoption, higher battery energy densities, and the need for efficient thermal management in EV modules.

Which region dominates the market?

Asia‑Pacific leads, with Europe also holding a significant share.

What are the emerging trends?

Development of nano‑enhanced BN fillers, integration of silicone composites into battery pack structures, and focus on recyclable, low‑VOC thermal interface materials.