SYNtherm® APA/80


SYNtherm® APA/80 is a flexible 3-ply insulating material made of polyester film with a layer of aramid paper marked with green stripes on both sides.


The proven dielectric properties of the polyester film and the excellent mechanical and thermal properties of the outer aramid paper 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.


SYNtherm® APA/80 is a cost-effective insulating material which can be installed in suitable insulating systems of class H (180 °C) and is used in electric motors as slot insulation, phase insulation and wedges.

SYNtherm® APA/80 is used as core, interlayer and final insulation for transformers. It can also be used for slot insulation, interphase and liner insulation in class F/H electric motors.


Suitable for class H (180 °C) systems.
UL approved e.g. E247773.
RoHS compliant according to 2011/65/EU.

Delivery format

Total thicknesses in µm:

220, 300, 360, 480


SYNtherm® APA/80 is available:

- in tapes: depending on material thickness on request

  beginning at 6 mm (thin material)

- in rolls: 968 mm



- Depth approx. 1-12 mm; distance approx. 1-10 mm

- Form widths of 10 mm to 240 mm, thickness on 



PET-film + aramid paper on both sides

Technical data

  Unit SYNtherm APA/80
Nominal thickness mm 0.22 0.30 0.36 0.48
Dielectric strength kV 10 16 23 > 25
  Unit SYNtherm APA/80
Nominal thickness mm 0.22 0.30 0.36 0.48
Typical thickness mm 0.22±15% 0.29±15% 0.36±15% 0.47±10%
Specific weight g/m² 200 310 385 540
film thickness µm 50 125 190 300
Aramide paper thickness µm 80 80 80 80
Tensile strength longitudinal N/cm 200 270 360 450
Tensile strength transversal N/cm 130 260 300 350
SYNtherm® is a registered Trademark of Synflex
Zertifikat - ISO/TS 16949 Zertifikat - ISO 9001 Zertifikat - UL