POROFOL ® 4002

POROFOL ® 4002 consists of highly absorbent mica paper based on uncalcined muscovite and PET-film as a hardener free epoxy resin.

POROFOL ® 4002 is a flexible tape suitable for hand and machine taping.  In spite of the PET-film a great number of layers can be impregnated in a short time due to the high porosity of the mica paper.  Mechanical and electrical properties of the final insulation mostly depend on the impregnating resin used.


POROFOL ® 4002 is used in VPI-systems for continuous insulation of coils and bars of low and high voltage machines a well as for interlayer insulation in dry type transformers.

Roll maximum width 1000 mm
Tapes from 10 mm width upward


Minimum 12 months at 20°C
Maximum 24 months at 5°C


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Product Description

Properties Test Method Unit Value
Nominal thickness IEC 60371-2 mm 0.14 ± 0.02
Total substance IEC 60371-2 g/m² 230± 20
PET-film IEC 60371-2 g/m²
42 ± 2
Mica paper IEC 60371-2 g/m² 180 ± 15
Resin content IEC 60371-2 g/m² 8 -2 +3
Tensile strength IEC 60371-2 N/cm ≥ 40
Breakdown voltage IEC 60371-2 kV ≥ 5

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DISCLAIMER: The technical information contained herein is the result of extensive testing in the manufacturer’s laboratories. In addition any application advice given verbally, in writing or by testing corresponds to the best of our knowledge and belief. Since the use and application of any of our products lies beyond our area of control, it remains the responsibility of the user to verify the product’s suitability for their application.

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