CALMICA-FLEX ® SI 2726 consists of mica paper with aramide fibres impregnated with silicone resin and a glass cloth as carrier.  The insulation with with  CALMICA-FLEX ® SI 2726 shows good taping properties and very high thermal stability.  It remains flexible after heat treatment.   CALMICA-FLEX ® SI 2726 is compatible with solvent free silicon impregnating resins.


CALMICA-FLEX ® SI 2726 is used e.g. for endwinding  insulation in high voltage machines of thermal class 180 (H).  For copper strand conductor and main insulation of rotor windings CALMICA-FLEX ® SI 2726 is used as well as for pole coils and connections in traction motors up to thermal class 200 (C).  CALMICA-FLEX ® SI 2726 can be processed with or without an impregnation process with silicone resin

Rolls maximum width 1000 mm
Tapes from 10 mm width upward


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


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Product Description

Technical Data 

Test Method

Unit Value Value
Nominal thickness IEC 60371-2 mm 0.10
+0.03 – 0.02
≥ 80
+0.03 – 0.02
Total substance IEC 60371-2 g/m² 132 ± 11 188 ± 16
Mica paper IEC 60371-2 g/m² 80 ± 8 120 ± 10
Glass cloth IEC 60371-2 g/m² 24 ± 1 33 ± 3
Resin content IPV 18.5.3 g/m² 28 ± 5 35 ± 4
Tensile strength IEC 60971-2 N/cm ≥ 80 ≥ 120

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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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