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SynTherm® – Insulating Materials

SynTherm® NPN/80

SynTherm® NPN/80 is a flexible 3-ply insulation consisting of a polyester film with a calandered Nomex® layer with green strips.


The proven dielectric properties of the polyester film and the excellent mechanical and thermal properties of the outer Nomex® layers result in a high performance insulating material. The ability of the outer layers to absorb impregnants results in exceptional bonding between all winding components.


SynTherm® NPN/80 is a cost-effective insulating material which can be installed in suitable insulating systems of class H (180 °C) and is used in electric motors as slot insulation, phase and wedges. SynTherm® NPN/80 is used as core, interlayer and final insulation for transformers.

  • Suitable for class H (180 °C) systems
  • Insulating material acc.IEC 60626
  • UL approved, e.g. E247773
  • RoHS compliant acc. 2011/65/EC
  • Test standard IEC 60626-2
  • Sample conditioning acc. to standard atmosphere 23/50
Delivery forms

Total thickness in μm:
220, 250, 300, 360, 420, 480

SynTherm® NPN/80 can be supplied:
in slit rolls from widths of 6 mm (depending on thickness)  and above
in rolls approx. width of 900 mm
in sheets on request: approx. 600 x 900 mm, 900 x 1000 mm

Optional overall diameter of the slit rolls/ rolls
approx. 240, 330 or 450 mm.

depth approx. 1 - 12 mm, distance approx. 1 - 10 mm
from widths of 10 to 240 mm and thickness of 0.20 mm


PET-film + calandered Nomex® layer on both sides

Technical data
Total thickness  Thickness tolerance max.  Film thickness  Nomex® paper thickness  Specific weight  Tensile strength longitudinal*  Tensile strength transversal*  Elongation at break longitudinal*  Elongation at break transversal* 
Unit of measure            
mm  0.22 0.25 0.30 0.36 0.42 0.48
± 15 ± 15 ± 15 ± 15 ± 10 ± 10
µm  50 75 125 190 250 300
µm  80 80 80 80 80 80
g/m²  220 255 325 420 500 570
N/mm²  90 90 90 100 100 100
N/mm²  80 80 80 95 95 95
10 20 20 20 20 20
20 25 25 25 25 25
Total thickness  Dielectric strength (unfold) 
Unit of measure            
mm  0.22 0.25 0.30 0.36 0.42 0.48
kV  10 12 16 23 26 28

SynTherm® is a registered trademark of SynFlex.
Nomex®, Kapton®, KAPTON® are registered trademarks of E.I. Du Pont de Nemours and Company.

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