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SynTherm® – Insulating Materials

SynKraft® VSP H2

SynKraft® VSP H2 is a tear-proof, flexible 2-ply insulation consisting of a polyester film with special presspaper attached to one side.


The pressboard displays good absorption of impregnants, resulting in exceptional bonding between all winding components after impregnating.
The polyester film improves the electrical and mechanical properties of the pressboard layer in the composite material, especially the resistance to tears, and provides excellent gliding properties for an automatic winding feed. On the other hand, the pressboard layer facing the laminated core is protected by the polyester film during processing.


SynKraft® VSP H2 is used as an extremely costeffective slot insulation and slot closure in stators and rotors, especially for small motors, and is often applied as interlayer insulation and final insulation in small transformers.

  • Class B (130 °C) insulating material
  • Insulation according to IEC 60626
  • RoHS compliant according to 2011/65/EU
  • Test method IEC 60641-2
  • Sample conditioning acc. to standard atmosphere 23/50
Delivery forms

Total thickness in μm:
100, 130, 180, 230, 280, 330, 380

SynKraft® VSP H2 can be supplied as:

  • in slit rolls from widths of 6 mm (depending on thickness) and above
  • in rolls approx. 630 mm or 1,260 mm
  • in sheets approx. 630 mm x 800 mm or approx. 800 mm x 1,260 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 + one-sided special pressboard overlay

Technical data
Total thickness  Nominal thickness of film  Specific weight  Elongation at break longitudinal  Elongation at break transversal  Tensile strength longitudinal  Tensile strength transversal  Dielectric strength 
Unit of measure              
mm  0.10 0.13 0.18 0.23 0.28 0.33 0.38
µm  23 23 23 23 23 23 23
g/m²  115 165 215 290 350 430 500
3 3 3 5 5 5 5
10 10 10 13 13 13 13
N/mm²  100 85 90 90 90 85 90
N/mm²  65 60 60 60 60 60 60
kV  7 7 7 8 8 9 9

SynKraft® 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