SynTherm® – Insulating Materials SynTherm® AHA

SynTherm® AHA is a flexible 3-ply insulation consisting of a polyimide film with a calendered aramid paper layer on both sides.

The excellent electric and thermal properties of the polyimide film and the excellent mechanical and thermal properties of the outer aramid paper layers result in a high per-formance insulating material. The outer layers protect the polyimide film against hydrolysis influences and mechanical stress.

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SynTherm® AHA is used in electric motors with high performance ratio as slot and phase insulation or wedge. SynTherm® AHA can also be used as core, interlayer und final insulation for transformers when a very high temperature resistance at high mechanical load is requested.


  • Temperature resistant up to 180 °C

Delivery forms

Total thickness in μm: 200, 300, 400

SynTherm® AHA is available:

  • tapes as of 6 mm width
  • rolls approx. 920 mm width


Polyimide film + calandered aramid paper on both sides

Technical data

Typical mechanical properties
Property Unit of measure
Nominal thickness mm 0.20 0.30 0.40
Typical thickness mm 0.20±15 % 0.29±15 % 0.39±10 %
Specific weight g/m² 190 315 440
Polyimide thickness µm 40 125 125
Aramid paper thickness µm 80 80 130
Tensile strength longitudinal N/10 mm 190 280 400
Tensile strength transversal N/10 mm 100 180 230
Typical electrical properties
Property Unit of measure
Nominal thickness mm 0.20 0.30 0.40
Dielectric strength (unfold) kV 8 14 14