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DrillENTEK EPX is an extremely high porosity separator designed to provide ultra-low impedance for specialty battery applications. It has also been used as a thin film (7-12µm) PE substrate in various ceramic and PVDF coating applications. Ceramic coated separators provide outstanding high temperature dimensional stability in HEV and EV applications while PVDF coated separators are commonly used in large format Li-ion polymer cells.

Nominal Porosity


Available Thicknesses

9µm, 12µm

Typical Characteristics

These are typical characteristics for the EPX line. ENTEK routinely customizes separators based upon customer requirements.

Thickness (average) 12 µm
Basis Weight 5.5 g/m2
Air Permeability 70 sec / 100 ml
Tensile Strength MD ≥ 1000 kg/cm2
TD ≥ 700 kg/cm2
Tensile ElongationMD - 60%
TD - 260%
Puncture Resistance 305g
Thermal Shrinkage @ 120 C, 1 hr. MD - 10%
TD - 5.5%

This data sheet only shows typical properties. We urge purchasers to conduct tests to determine final suitability for their specific end uses. No statement with respect to use is intended as a positive recommendation for such use, no guarantee of performance expressed or implied is made.

Nominal Thickness9 µm
Basis Weight4 g/m2
Nominal Porosity54%
Air Permeability45 sec/100 ml
Puncture Resistance260g
Tensile StrengthMD ≥ 1100 kg/cm2
TD ≥ 700
Tensile ElongationMD - 44%
TD - 150%
Thermal Shrinkage @120C, 1 hr.MD - 12%
TD - 9%