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Glass-fibre-profiles connected with insulating tapes.


Glass-fibre-duct-spacing-mats are a cost effective cooling channel solutions with free selectable / adjustable distances of single profiles. Also different profile-shapes can be used in one mat.


Glass-fibre-duct-spacing-mats are used in transformer and coils with cooling channels. They can be used in automated winding processes.


  • Insulating material class H (180 °C)
  • RoHS-compliant acc. to 2011/65/EC

Delivery forms

  • Length: Up to 25 m
  • Width: Up to 3000 mm

Also deliverable in kits.



  • Dogbone
  • Square
  • Round

Insulating tapes:

  • SynTherm® YT510
  • NOMEX®
  • SynTherm® DMD
  • SynTherm® APA
  • SynTherm® NPN
    Mylar® A

Other materials on request.

Technical Data

  Unit of measure  
Casting resin   Polyester/Epoxy
Reinforcement   Glas-Roving
Fibre content % > 60
Specific weight g/cm³ > 1.85
Bending strength N/mm²  480
Bending strength E-Module N/mm²  35x10^3
Tensile strength N/mm²  450
Compressive strength N/mm²  240
Dielectric constant   apprx. 4
Specific resistance Ωxcm 10^12
CTI   KC 600
1-Min.-voltage test kV/mm 8
Coefficient of expansion K-1 10-15^-16
Water absorption % < 5
Heat conductivity W/m*k 0.3
Thermal class   H (180 °C)
Corona information, 25.03.2020

Dear business partners,

We are all together confronted with an unprecedented situation. The corona pandemic (SARS-CoV-2) affects us all - personally and professionally. In the meantime, however, the appeal - to assume social responsibility - is becoming increasingly important. Thinking and acting in terms of gaining commercial advantage must not be our maxim to act on at the moment. Each of us is affected, which is why the burdens should not be borne unilaterally, but should remain balanced.

As IsoTek, we therefore consider it our duty to comply with all contractual agreements as they existed before the crisis triggered by the corona pandemic began. If we all share this basic idea, we are able to maintain our existing business structures to a large extent and, once the crisis is over, we can start from this basis again with optimism and energy.

We would like to assure you that with our prevention and contingency management, updated daily depending on the situation, we have initiated all necessary measures for the protection of our employees and all stakeholders. To this day, we have thus succeeded in making all of our company's services available to our business partners in the usual manner. We will of course inform you immediately of any impairment of our supply chain.

We wish you and your employees every success in coping with the upcoming tasks and, above all, please stay healthy!

In this spirit, we count on you,

Your IsoTek Team