SynTape® – Electrical Adhesive Tapes 3M no. 79

3M electro-insulating tape No. 79 is a UL-approved fibre glass adhesive tape with acrylate adhesive.

High tear and temperature resistant fabric tape with good varnish and resin resistance. Very easy to form!

Download datasheet


As electrical insulation of coils and transformers, as final insulation and as coil ends of stators. It is used if high mechanical strength, stress relief and thermal resistance are required.



Delivery forms

  • Width: From 2.5 mm, in 0.1 mm increments
  • Standard length: 55 m
  • Core diameter: 76 mm (3“)
  • Special widths on request






Adhesive tapes should always be stored in a cool, dry place at approx. 20 °C and 50 - 60 % relative humidity. The storage period should not exceed 6 months.

Punched parts, bent & formed parts

We offer a wide range of punched and formed parts: Rolls, individual parts unsorted, sorted or stacked, adhesive on one or both sides, non-adhesive, with or without a grip tab.


More about punched parts

Technical data

Property Unit of measure
Standard colours White
Type/ Ordering information 3M electro-insulating tape no. 79
Backing Glass fibre
Backing thickness mm 0.127
Adhesive Acrylate
Thermal class 155 °C
Electrolyt. corrosion value A 0.9
Dielectic strength kV 3
Adhesiveness / Adhesion to steel N/cm 3.3
Elongation at break % 5
Tensile strength N/cm 262
Total thickness mm 0.177