The Global Vacuum Pressure Impregnation (VPI) Solvent-free Impregnation Resin Market was valued at USD 352.5 Million in 2025 and is projected to reach USD 545.2 Million by 2034, growing at a Compound Annual Growth Rate (CAGR) of 4.8% during the forecast period (2026–2034). This growth is being fueled by the expansion of the industrial manufacturing and energy sectors, stringent environmental regulations phasing out solvent-based systems, and the accelerating adoption of high-performance electrical insulation solutions for motors and generators.

As the global push for electrification and energy efficiency intensifies, the demand for reliable, durable electrical components has never been higher. At the heart of this reliability is the Vacuum Pressure Impregnation process, which uses specialized solvent-free resins to provide superior insulation. In this blog, we profile the Top 10 Companies in the VPI Solvent-free Impregnation Resin Industry—a group of chemical specialists and material innovators shaping the future of electrical manufacturing.

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🔟 1. WACKER

Headquarters: Munich, Germany
Key Offering: SILRES® impregnating resins, silicone-based VPI systems

WACKER is a global leader in silicone chemistry and a premier supplier of high-performance VPI resins. Their SILRES® product line includes solvent-free silicone resins renowned for exceptional thermal stability, excellent dielectric strength, and resistance to harsh environmental conditions. These resins are critical for insulating motors and generators in demanding applications such as electric vehicles, wind turbines, and heavy industrial equipment.

Innovation Initiatives:

• Development of high-temperature resistant silicone resins (Class H and above)

• Focus on products with low viscosity for deep penetration and quick curing cycles

• Commitment to sustainability through long-lasting, durable insulation solutions

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9️⃣ 2. ELANTAS

Headquarters: Wesel, Germany
Key Offering: Epoxy and polyester-based VPI resins, insulating varnishes

As part of the ALTANA Group, ELANTAS is a specialist in electrical insulation materials with a comprehensive portfolio of solvent-free VPI resins. The company serves a global clientele in the automotive, industrial, and energy sectors, providing formulations that ensure reliability under extreme electrical and thermal stress.

Innovation Initiatives:

• Advanced epoxy systems with high glass transition temperatures (Tg)

• R&D focused on improving mechanical strength and partial discharge resistance

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8️⃣ 3. Von Roll

Headquarters: Breitenbach, Switzerland
Key Offering: Vacrel® impregnating resins, complete insulation systems

Von Roll Insulation, a Division of Daikin Industries, is a world-renowned provider of electrical insulation systems. Their solvent-free Vacrel® VPI resins are engineered for high-voltage rotating machines, offering outstanding chemical resistance and thermal endurance.

Innovation Initiatives:

• Integration of resin systems with compatible insulating materials (mica, films)

• Development of environmentally friendly, low-VOC products for global compliance

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7️⃣ 4. Axalta Coating Systems

Headquarters: Philadelphia, Pennsylvania, USA
Key Offering: Voltron® VPI resins, electrical insulation coatings

Axalta is a leading global supplier of liquid and powder coatings, with a strong presence in the electrical insulation market through its Voltron® product line. Their solvent-free VPI resins are designed for use in electric motors, transformers, and other components requiring robust dielectric protection.

Innovation Initiatives:

• Focus on fast-curing formulations to enhance manufacturing productivity

• Products tailored for the growing electric vehicle traction motor market

Download FREE Sample Report: Vacuum Pressure Impregnation(VPI) Solvent-free Impregnation Resin Market – View in Detailed Research Report

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6️⃣ 5. Hitachi Chemical (Showa Denko Materials)

Headquarters: Tokyo, Japan
Key Offering: Epoxy VPI resins, insulating materials

As part of Showa Denko Materials, following the integration of Hitachi Chemical, this entity is a major force in advanced materials for electronics and electrical systems. Their solvent-free epoxy VPI resins are widely used in Asia and globally for insulating large high-voltage motors and generators.

Innovation Initiatives:

• Strong R&D focus on materials for next-generation power generation equipment

• Expansion of product portfolio to serve renewable energy and EV sectors

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5️⃣ 6. KYOCERA Chemical Corporation

Headquarters: Yamaguchi, Japan
Key Offering: One-component and two-component epoxy VPI resins

KYOCERA Chemical offers a range of high-performance VPI resins known for their reliability and consistency. The company’s expertise in fine ceramics and organic materials translates into resins that provide excellent insulation and thermal conductivity for demanding electrical applications.

Innovation Initiatives:

• Development of resins with high thermal conductivity for better heat dissipation

• Focus on improving compatibility with various substrate materials

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4️⃣ 7. Mitsubishi Electric Corporation

Headquarters: Tokyo, Japan
Key Offering: Insulation resins for in-house motor production, technical partnerships

While primarily a manufacturer of electrical equipment, Mitsubishi Electric possesses deep expertise in insulation materials developed for its own extensive product lines, including high-efficiency motors and generators. This vertical integration provides unique insights into resin performance requirements.

Innovation Initiatives:

• Proprietary resin formulations for extreme environment applications

• Research into materials supporting higher power densities in compact motors

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3️⃣ 8. ALTANA (ECKART GmbH)

Headquarters: Wesel, Germany
Key Offering: Specialty resins under the ELANTAS brand (see #2)

ALTANA’s ELANTAS division is a repeat entry due to its significant market share and technological leadership. The company’s global manufacturing footprint and strong technical service support make it a key partner for motor manufacturers worldwide.

Innovation Initiatives:

• Sustainable product development aligned with circular economy principles

• Customized solutions for specific customer application challenges

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2️⃣ 9. Master Bond Inc.

Headquarters: Hackensack, New Jersey, USA
Key Offering: Specialty epoxy, silicone, and polyurethane impregnation resins

Master Bond is a US-based manufacturer of high-performance adhesives, sealants, and coatings, including formulations suitable for vacuum pressure impregnation. The company is known for its ability to develop custom-engineered solutions for critical applications in aerospace, medical, and electronics.

Innovation Initiatives:

• Development of thermally conductive and electrically insulating resins

• Focus on user-friendly, room-temperature curing systems

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1️⃣ 10. DELO Industrie Klebstoffe

Headquarters: Windach, Germany
Key Offering: High-performance adhesives and resins for technical applications

DELO is a specialist in adhesives and resins for demanding industrial applications, including those requiring electrical insulation. While a niche player compared to larger chemical companies, DELO is recognized for its innovative formulations used in precision components, including sensors and micro-motors.

Innovation Initiatives:

• Expertise in UV-curable and dual-cure systems for rapid processing

• Development of materials with exceptional purity and low outgassing

Get Full Report Here: Vacuum Pressure Impregnation(VPI) Solvent-free Impregnation Resin Market – View in Detailed Research Report

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🌍 Outlook: The Future of VPI Solvent-free Resins Is Smarter and More Sustainable

The VPI solvent-free impregnation resin market is undergoing a significant evolution. While traditional epoxy-based systems continue to dominate, the industry is investing heavily in advanced material science, process optimization, and sustainability initiatives.

📈 Key Trends Shaping the Market:

• R&D into bio-based epoxy and polyester resins to reduce environmental footprint

• Increasing demand for resins compatible with high-speed manufacturing for electric vehicles

• Integration of IoT and smart sensors for real-time monitoring of the VPI process

• Growing emphasis on resins that enable higher operational temperatures for increased power density

Get Full Report Here: Vacuum Pressure Impregnation(VPI) Solvent-free Impregnation Resin Market – View in Detailed Research Report

The companies listed above are not only supplying essential materials—they’re enabling the electrification and efficiency of the modern industrial world.