ENTEK International LLC

Based in the US, ENTEK International LLC specializes in the design and production of advanced battery separators for various battery types, enhancing energy storage efficiency and reliability across industries. Founded in 1984, ENTEK International LLC focuses on manufacturing advanced materials for battery applications. The company has maintained a consistent business strategy over the years, emphasizing innovation in battery separator technology. ENTEK is headquartered in the United States and has a global presence with offices servicing clients worldwide.

In September 2025, I Squared Capital agreed to acquire a majority stake in ENTEK for USD 800 mn, allowing further business development and market expansion. ENTEK specializes in the production of advanced battery separators, which are critical components in a variety of battery types, including SLI (starting, lighting, ignition), start-stop, deep cycle, motive power, and stationary batteries. Their core offerings also encompass lead-acid separators and lithium-ion separators, manufactured using a unique wet process that leverages ultrahigh molecular weight polyethylene (UHMWPE). These separators enhance performance and reliability across demanding environments, catering to industries such as automotive, consumer electronics, and stationary energy storage solutions.

ENTEK's Absorptive Glass Mat technology further solidifies their position in the market by providing industry-leading quality in AGM (Absorptive Glass Mat) products. ENTEK serves a global clientele across six continents, focusing on regions investing in energy storage solutions for vehicles, handheld electronics, and other consumer goods. ENTEK generates revenue through direct sales of its specialized battery separators and extrusion systems to a diverse range of B2B clients, including manufacturers in the automotive, renewable energy, and consumer electronics sectors. The company’s transactions typically involve customized agreements tailored to client requirements, ensuring optimal solutions for energy storage needs.

Partnerships with larger manufacturers allow ENTEK to integrate its products into broader battery production lines, enhancing overall efficiency and performance. The pricing structure reflects the advanced technology and quality inherent in ENTEK’s flagship products, designed to meet stringent industry standards. By focusing on innovation and customer success, ENTEK maintains robust relationships with both existing and prospective clients, thereby driving sustained revenue growth. In September 2025, following the acquisition by I Squared Capital, ENTEK International LLC plans to enhance its business development through the launch of new products and expansion into new markets.

The company aims to introduce innovative battery separator technologies that will cater to emerging energy storage applications by mid-2026. Additionally, ENTEK is targeting expansion into the Asian and European markets, planning to establish new operational facilities by the end of 2026 to support this growth. The recent funding of USD 800 mn will be strategically utilized to back these upcoming initiatives and support the company's ongoing development efforts.