The Global Glass Fiber Battery Separator Felt Market was valued at USD 713 Million in 2025 and is projected to reach USD 1126 Million by 2034, growing at a Compound Annual Growth Rate (CAGR) of 6.8% during the forecast period (2025–2034). In terms of volume, the market reached approximately 183.6 Kilotons in 2025. This robust growth is being driven by the explosive expansion of the global Electric Vehicle (EV) market, the rapid deployment of grid-scale energy storage, and the relentless pursuit of higher-safety and longer-cycle battery technologies.

As the energy storage industry transforms toward electrification and safer operations, the spotlight is on the critical material suppliers who are enabling innovation, performance, and reliability. In this blog, we profile the Top 10 Companies in the Glass Fiber Battery Separator Felt Industry—a mix of global advanced materials giants and specialized manufacturers shaping the foundational components of next-generation batteries.

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🔟 1. Jiangsu Changhai Composite Materials Co., Ltd.

Headquarters: Jiangsu, China
Key Offering: Borosilicate Glass Fiber Felts, Alkali-Free Glass Fiber Felts, Wet-Laid Separators

Jiangsu Changhai is a leading force in the market, recognized for its significant production capacity and focus on the lithium-ion battery sector. The company specializes in manufacturing high-quality glass fiber felts using advanced wet-laid and needling processes, catering to the stringent demands of EV and energy storage system (ESS) battery manufacturers, primarily within Asia’s massive battery ecosystem.

Innovation & Strategy Initiatives:

• Heavy investment in capacity expansion to meet surging EV demand.
• R&D focused on ultra-thin, high-strength felts for increased energy density.
• Strong integration within China’s domestic battery supply chain.

Download FREE Sample Report: Glass Fiber Battery Separator Felt Market – View in Detailed Research Report

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9️⃣ 2. Hollingsworth & Vose (H&V)

Headquarters: East Walpole, Massachusetts, USA
Key Offering: High-performance glass fiber battery separators, advanced filtration media

A global leader in engineered nonwoven materials, Hollingsworth & Vose leverages decades of expertise in filtration and separation to produce specialized glass fiber felts for demanding battery applications, including flow batteries. Their products are known for precise pore size control, excellent chemical resistance, and high thermal stability.

Innovation & Strategy Initiatives:

• Proprietary manufacturing technologies for uniform pore structure.
• Strong R&D pipeline for next-generation energy storage solutions.
• Global production and technical support footprint.

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8️⃣ 3. ENTEK International LLC

Headquarters: Lebanon, Oregon, USA
Key Offering: Wet-process lithium-ion battery separators, Ceramic-coated separators

While traditionally focused on polyolefin separators, ENTEK has strong material science capabilities relevant to high-performance battery components. Their expertise in separator manufacturing and deep understanding of battery requirements position them as a knowledgeable player with potential in advanced felt development, particularly for specialized applications requiring hybrid solutions.

Innovation & Strategy Initiatives:

• Deep integration with global battery cell manufacturers.
• Focus on safety-enhancing separator technologies.
• Process innovation for high-quality, consistent output.

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7️⃣ 4. Alkegen

Headquarters: New York, New York, USA
Key Offering: High-temperature insulation fibers, advanced material solutions

Formed from the combination of Unifrax and Lydall, Alkegen is a powerhouse in high-performance specialty materials. The company’s extensive knowledge in high-temperature glass fibers and engineered felts provides a strong foundation for developing separator solutions, particularly for applications like flow batteries where thermal and chemical stability are paramount.

Innovation & Strategy Initiatives:

• Leveraging legacy expertise in fiber science for new energy applications.
• Developing material solutions for extreme operating environments.
• Global scale and application engineering support.

Download FREE Sample Report: Glass Fiber Battery Separator Felt Market – View in Detailed Research Report

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6️⃣ 5. Freudenberg Performance Materials

Headquarters: Weinheim, Germany
Key Offering: Technical nonwovens, filtration media, battery components

Freudenberg is a global technology group with deep roots in nonwoven textiles and filtration. Their expertise in precision nonwoven manufacturing processes is directly applicable to producing high-quality glass fiber felts. The company focuses on engineered materials that meet rigorous automotive and industrial standards, making them a key partner for European and global battery makers.

Innovation & Strategy Initiatives:

• Advanced process control for reproducible separator quality.
• Focus on sustainability and material efficiency.
• Collaborative development with automotive OEMs and battery producers.

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5️⃣ 6. Chang Zhou Jiu Lian Battery Material Co., Ltd.

Headquarters: Jiangsu, China
Key Offering: Glass Fiber Separator Felts, Battery Component Materials

Chang Zhou Jiu Lian is a significant Chinese manufacturer specializing in materials for the battery industry. The company produces glass fiber separator felts designed for various battery types, focusing on the cost-performance ratio required for mass-market EVs and large-scale ESS projects. Their strength lies in serving the high-volume, fast-growing domestic Chinese battery market.

Innovation & Strategy Initiatives:

• Rapid scaling of production to meet domestic battery gigafactory demand.
• Optimization of manufacturing processes for cost efficiency.
• Development of felts tailored for specific cathode/anode chemistries.

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4️⃣ 7. Xiamen TOB New Energy Technology Co., Ltd.

Headquarters: Xiamen, Fujian, China
Key Offering: Coated separators, ceramic separators, glass fiber composite felts

Xiamen TOB New Energy is an innovative player focusing on advanced battery separator technologies. The company is actively engaged in the research and development of enhanced separator materials, including those based on or incorporating glass fibers. Their work often targets improvements in electrolyte wettability, thermal shutdown performance, and mechanical strength.

Innovation & Strategy Initiatives:

• R&D focused on surface modification of separator materials.
• Development of composite and hybrid separator structures.
• Targeting high-energy-density and fast-charging battery applications.

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3️⃣ 8. Zisun Technology Co., Ltd.

Headquarters: Shandong, China
Key Offering: Lithium-ion battery materials, separator substrates

Zisun Technology is a specialized manufacturer contributing to China’s battery materials ecosystem. The company is involved in producing base materials for batteries, including separator felts. Its strategy is aligned with supporting the localized supply chain for battery production, ensuring material availability and technical responsiveness for Chinese battery cell manufacturers.

Innovation & Strategy Initiatives:

• Expanding production capacity in line with regional battery growth.
• Focus on quality consistency and batch-to-batch uniformity.
• Collaborations with research institutes for material advancement.

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2️⃣ 9. Tianma Group

Headquarters: Zhejiang, China
Key Offering: Glass fiber products, technical textiles, battery material substrates

Tianma Group is a diversified manufacturer with substantial expertise in glass fiber products. This background provides a solid foundation for producing glass fiber felts used in battery separators. The company leverages its vertical integration in fiber production to control quality and cost, serving as a reliable supplier to the burgeoning energy storage market.

Innovation & Strategy Initiatives:

• Utilizing in-house glass fiber production for separator felt manufacturing.
• Exploring applications in emerging battery technologies (e.g., sodium-ion).
• Focus on process automation to enhance productivity.

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1️⃣ 10. Jiangsu Dall Energy Saving Technology Co., Ltd.

Headquarters: Jiangsu, China
Key Offering: Energy-saving materials, thermal insulation felts, battery component materials

Jiangsu Dall leverages its experience in high-temperature insulation and energy-saving materials to produce glass fiber felts suitable for battery applications. The company’s understanding of thermal management and material durability aligns well with the safety requirements of modern batteries, particularly for large-format cells used in transportation and storage.

Innovation & Strategy Initiatives:

• Applying thermal material science to battery safety solutions.
• Developing felts with optimized porosity for electrolyte uptake and retention.
• Cost-effective manufacturing tailored for the ESS market segment.

Get Full Report Here: Glass Fiber Battery Separator Felt Market – View in Detailed Research Report

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🌍 Outlook: The Future of Battery Separator Felts Is High-Performance and Safe

The glass fiber battery separator felt market is undergoing a dynamic shift. While traditional polyolefin separators dominate consumer electronics, the industry is investing heavily in high-safety, high-stability materials for demanding applications in electric mobility and grid storage.

📈 Key Trends Shaping the Market:

• Accelerated EV adoption driving demand for separators with superior thermal runaway resistance.
• Gigafactory-scale production necessitating high-volume, consistent-quality separator supply.
• R&D into ultra-thin felts and surface coatings to enhance energy density and cycle life.
• Growing exploration of glass fiber felts in next-gen batteries like sodium-ion and advanced flow batteries.

Get Full Report Here: Glass Fiber Battery Separator Felt Market – View in Detailed Research Report

The companies listed above are not only supplying a critical battery component—they’re enabling the safer, more reliable energy storage essential for a decarbonized future.