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.


RoHS compliant according to 2011/65/EU.

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.

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
Total thickness  mm  0.177
Tensile strength  N/cm  262
Elongation at break  5
Adhesiveness / Adhesion to steel  N/cm  3.3
Dielectic strength  kV  3
UL FILE NO.    E 17385 OANZ 2