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SynTherm® – Insulating Materials

SynTherm® NPN/130

SynTherm® NPN/130 is a flexible 3-ply insulation consisting of a polyester film with a calandered Nomex® layer.


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. Smooth and abrasion resistant surface and therefore easy to machine processing.


SynTherm® NPN/130 is used in electric motors as slot insulation, phase insulation and wedges.
SynTherm® NPN/130 is used as core, interlayer und final insulation for transformers.

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

Total thickness in μm:
330, 380, 630

SynTherm® NPN/130 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® 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  0.33 0.38 0.63
±15 ± 10 ± 10
µm  75 125 350
µm  130 130 130
g/m²  360 440 730
N/mm²  90 90 90
N/mm²  70 70 70
10 10 15
15 15 20
Total thickness  Dielectric strength* 
Unit of measure      
mm  0.33 0.38 0.63
kV  13 17 < 30

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