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POROFOL ® 4002

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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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