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Advancing state-of-the-art Lithium-Ion battery separators every day.

If it stores energy or powers a system, ENTEK separators have been there. We’ve applied the same expertise to the global lithium ion battery industry for over a decade. Our customers manufacture a wide variety of batteries with different designs and chemistries for applications that range from smartphones to e-bikes to military devices.


LiIon Battery Separator TechnologyENTEK is the world leader in battery separator technology. Our deep knowledge of battery chemistry, separator properties and in-application uses is what sets us apart from the competition.

Separators are an integral part of the performance, safety, and cost of lithium batteries. The term “lithium batteries” refers to both (1) non-rechargeable, lithium metal-based batteries and (2) rechargeable lithium-ion batteries which are widely used in portable electronic devices. During normal operation, the principal functions of the separator are to prevent electronic conduction (i.e., shorts or direct contact) between the anode and cathode while permitting ionic conduction via the electrolyte.

For small commercial cells under abuse conditions, such as external short circuit or overcharge, the separator is required to shut down at temperatures well below where thermal runaway can occur. Shutdown results from collapse of the pores in the separator due to melting and viscous flow of the polymer, thus slowing down or stopping ion flow between the electrodes. Nearly all Li-ion battery separators contain polyethylene as part of a single- or multi-layer construction so that shutdown begins at ~135 °C, the melting point of polyethylene. Battery failures in the field, however, have demonstrated that shutdown is not a guarantee of safety. The principle reason is that, after shutting down, the internal temperature of the battery is often high enough to cause residual stress and reduced mechanical properties leading  to shrinkage, tearing, or pinhole formation.

ENTEK Lithium Overview


ENTEK Lithium Separators is a leading producer of polyethylene separators used in lithium primary and secondary batteries, with end uses ranging from portable devices to vehicles. ENTEK Separators are a biaxially-oriented, polyolefin separator that is manufactured by a unique polymer processing technology. The separator is largely composed of ultrahigh molecular weight polyethylene with an ultrafine, interconnected pore structure. Key performance characteristics include good mechanical properties, chemical inertness, and controlled shutdown with a high meltdown temperature. ENTEK distinguishes our product line based upon porosity of the separator and product thickness for a given application.

ENTEK Lithium Product Portfolio

Customer Service

ENTEK values our customers. We are known worldwide for not only our superior product offerings, but also for our outstanding people focused customer service. From technical service to the assurance given by our quality teams and systems, ENTEK knows business starts with great products and technology, and our people centered service keeps customers coming back.

Technical Service

The ENTEK research, development, quality and engineering teams are focused on designing products and services that deliver a strong value proposition to customers.  ENTEK and its regional representatives respond quickly to customer requests in the lithium-ion battery market.  ENTEK is willing to customize separator products for specific customer applications.  It is not unusual for ENTEK personnel to speak with a customer one week and have a production trial the following week to create a new separator for evaluation.  Responsiveness, transparency, and technical leadership are part of the commitment that ENTEK has to its lithium-ion customers


ENTEK Lithium-Ion Separators manufactures separators for Lithium applications to the highest standards. Our Global Enterprise Management System (GEMS) houses the documentation and data systems that assure quality is our highest priority. We are customer focused, driving our internal standards to ensure we meet and exceed our customers’ expectations. Through Standard Operating Procedures (SOP), Statistical Process Control (SPC), Rigorous Testing and Minitab Data Analysis, we ensure repeatability and reproducibility to our customers’ specifications, while striving for continuous improvement.

We are ISO 9001:2015 certified and continue to push our quality systems forward incorporating IATF 16949:2016 elements, including APQP, FMEA, SPC, MSA and PPAP under AIAG (Automotive Industry Action Group) guidelines.

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Contact Us


Tay Hwa Beng

Business Development Engineer
+65 6956 6119
+65 9757 9621

China & Taiwan

James Huang

Country Representative
+886 963 388 306


Graeme Fraser-Bell

VP - Li-Sales & Market Development
+44 7713 877032

South Korea

Jason Kim

Country Representative
+82 10 8288 7335

United States

Andrew Wimer

Account Manager North America
+1 541 259 3901

Richard W Pekala, ScD

Chief Technology Officer
+1 541 259 3901