NKK Cellulose separator (Low ESR Type) – TF4030

TF4030 Cellulose separator roll, 60mm x 100m.

Primary Applications

Cellulose separator for large cells, low Equivalent series resistance (ESR) type.

Product Benefits

  • High reliability, Lower ESR
  • High electrolyte holding ratio
SKU: TF4030

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Cellulose based separator by Nippon Kodoshi Corporation. Highly absorbing and holds a good amount of electrolyte. Designed for low internal resistance. It is often used in supercapacitors, but can also be suitable for some batteries.

Technical Data (Typical Properties)

Basic Film Properties Unit of Measure Typical Value
Thickness μm 30
Width mm 60
Length mm 100
Density g/cm3 0.40
Porosity (calculated) % 73
Moisture % 5
Tensile Strength N/15mm 10.3
Air Resistance sec/100cc 109.6
Water Absorption mm/10min 35
pH 6.2



Because TF is made from cellulose, it tends to absorb moisture, and depending on circumstances, it might contain 7-10% moisture. When assembling cells with TF, unless you are using aqueous electrolytes, sufficient drying is required. The recommended drying condition is in the range of 100-160°C within 24 hours by vacuum drying.  After drying procedure, please handle the products under the low dew point environment. Recommended dew point is less than -50°C. In the drying procedure, the products may shrink about 1% lengthwise and widthwise, so please design your product after taking this shrinkage into consideration.