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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.


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
  • RoHS compliant acc. to 2011/65/EU
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
Nominal thickness  Typical thickness  Specific weight  Polyimide thickness  Aramid paper thickness  Tensile strength longitudinal  Tensile strength transversal 
Unit of measure      
mm  0.20 0.30 0.40
mm  0.20±15 % 0.29±15 % 0.39±10 %
g/m²  190 315 440
µm  40 125 125
µm  80 80 130
N/10 mm  190 280 400
N/10 mm  100 180 230
Typical electrical properties
Nominal thickness  Dielectric strength (unfold) 
Unit of measure      
mm  0.20 0.30 0.40
kV  8 14 14

SynTherm® is a registered trademark of SynFlex.

Corona information, 31.03.2020

Dear business partners,

Despite the progressing corona pandemic, we as SynFlex have succeeded to date in maintaining our business operations at all locations. We offer our customers the accustomed high level of service in terms of delivery flexibility and advisory competence and we maintain existing agreements with our suppliers. Our staff currently provide excellent services despite the many precautionary measures necessary to protect everyone's health. They are fully available to you, in administrative areas usually from a home office.

It remains to be seen how things will continue. Crisis management dominates. It is simply impossible to make serious forecasts about future economic and social changes. All forecasts are plain guessing.

Thus, the resolutions remain: maximum solidarity, responsible action and best possible maintenance of all structures. There will be a time after SARS-CoV-2!

In this spirit we wish you all much steadfastness and good health.

Your SynFlex Team