Products and Applications

ENS has a broad product offering including the industry’s most popular automotive separator. We also make SLI products designed for unique applications like EFB, and features like controlled elongation, glass mat laminations and customer specific designs to satisfy the most demanding automotive engineers from Japan, Germany and the USA.

PE for SLI




Starting, Lighting, and Ignition (SLI)
SLI battery manufacturers demand separators that provide excellent cycle life, strong durability, and low electrical resistance for every weather and road condition.

ENS has embraced start-stop technology with separator technology that supports the fast-charging, high electrical load performance that start-stop batteries must deliver.

ENTEK GE Brochure

ENS Product SEMS

MD Fracture SEM – 0.20 GE_STD

MD Fracture SEM – 0.20 GE_STD

MD Fracture SEM – 0.20 RX_LR

MD Fracture SEM – 0.20 RX_LR

MD Fracture SEM – 0.25 RX_ISY Specification

MD Fracture SEM – 0.25 RX_ISY Specification

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LR for EFB




LR enables battery makers to meet tough OEM requirements for the next generation of EFB batteries, delivering the highest cold-cranking performance of any polyethylene separator. Combining ultra-low electrical resistance and maximum durability, LR is the world’s most advanced battery separator.

LR has been extensively tested in EFB battery designs. The results of those tests confirm that ENTEK LR provides superior battery performance.

ENS LR offers benefits for premium SLI batteries, lowering overall battery resistance, increasing cold-cranking amps and offering excellent cycle life performance.

ENTEK LR Brochure


ENTEK LR was formulated and engineered to:

  • Prevent shorting and dendrite growth between electrodes
  • Have higher porosity and lower tortuosity
  • Facilitate more ionic conduction

These properties give LR the lowest electrical resistance of any battery separator on the market today.

Sustained Wettability

LR Separator maintains wettability even after being boiled in water and dried multiple times. Wettability is engineered into the separator. The low electrical resistance and increased cold cranking amps offered by ENTEK LR will last for the entire life of your battery.

Performance – Delivering Results in EFB Batteries

Batteries built with ENTEK LR separator have:

  • Lower Internal Battery Resistance
  • Improved Cold Cranking
    • EN U10: increased by 100 to 300mv
    • EN U30: increased by 60 to 140mv

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Motive Power
Motive power battery applications include e-rickshaw, forklifts, locomotives, and floor scrubbers just to name a few. ENS separators provide reliability and performance for those applications as well as the endurance for going that extra mile in golf cart batteries for extended playtime.  Motive batteries deliver deep demand on discharge (DOD) and require fast charge rates. Certain batteries need antimony in the grid to suppress corrosion and ensure longer battery life. These batteries require special separators to minimize water loss. ENTEK manufactures both PE and PE/rubber containing separators for these demanding applications.

Reserve (Stationary) Power
Reserve power batteries need to always be ready. End uses include nuclear, telecommunications, and infrastructure back-up systems. Dependability upon demand and long shelf life attributes are essential to deliver reliability. Technologies in these batteries include flooded lead acid and gel chemistries.

ENTEK Industrial Brochure

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Oxidation Resistance

The flooded lead acid battery presents a challenging oxidizing environment to the separator. The positive electrode has an extremely high electrochemical potential that promotes oxidation, and the oxygen gas that is generated at the positive electrode during charging is also extremely oxidizing. In this environment, chain scission of the polymer can lead to embrittlement and weakening of the separator, leading to possible tearing or puncture of the web and a potential short circuit.
To counter this threat of oxidation, ENS separators are made with a formulation and process that is designed delay or prevent weakening of the material. The combination of composition and process gives ENS separators high oxidation resistance that is measured in our laboratories by two different methods: the Electrochemical Oxidation Test and the Perox80 Chemical Oxidation Test.

The Electrochemical Oxidation Test places the test sample in direct contact with the oxygen that is generated during overcharge from a lead electrode in sulfuric acid at elevated temperature (70°C). Failure occurs after prolonged exposure to this environment and the time to failure is an indication of the Oxidation Resistance of the material. In the Perox80 Chemical Oxidation Test, the separator is exposed to an oxidizing solution of hydrogen peroxide and sulfuric acid at an even higher temperature (80°C) for periods of 24 to 72 hours. The puncture strength, tensile strength and elongation properties of the separator are measured as a function of time. This results in a plot of decreasing mechanical strength over time as shown in (3) below.


This figure shows the results of the Perox80 chemical Oxidation Test for the elongation of ENS separators compared to two competitor separators. The ENS separators start with higher elongation and maintain higher elongation throughout the duration of the test. Loss of elongation is associated with embrittlement of the separator. A brittle separator is unable to resist mechanical stresses placed on it such as by vibration, a grid wire or non-uniform electrode surface. Therefore preservation of elongation is a key measure of Oxidation Resistance of ENS separators.

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