SynTherm® – Insulating Materials SynTherm® APA/50

SynTherm® APA/50 is a flexible 3-ply insulating material made of polyester film with a layer of aramid paper marked with yellow 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.

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Application

SynTherm® APA/50 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 50 is used as core, interlayer and final insulation for transformers.

Standards

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

Delivery forms

Total thicknesses in µm:
130, 160, 180, 220, 240, 310, 370, 410, 470. Further thicknesses on request.

SynTherm® APA/50 is available:

  • in tapes: depending on material thickness on request beginning at 6 mm (thin material)
  • in rolls: 968 mm

Feathering:

  • Depth approx. 1-12 mm; distance approx. 1-10 mm
  • Form widths of 10 mm to 240 mm, thickness on request

Base

PET-film + aramid paper on both sides

Technical data

Typical mechanical properties
Property Unit of measure                   Test method 
Nominal thickness  mm  0.13 0.16 0.18 0.22 0.24 0.31 0.37 0.41 0.47 IEC 60626-2
Typical thickness  mm  0.13±15 % 0.16±15 % 0.18±15 % 0.21±15 % 0.24±15 % 0.30±15 % 0.36±10 % 0.40±10 % 0.46±10 %  
Specific weight  g/m²  120 160 190 230 260 350 440 510 570 IEC 60626-2
Film thickness  µm  23 50 75 100 125 190 250 300 350  
Aramid paper thickness  µm  50 50 50 50 50 50 50 50 50  
Tensile strength longitudinal  N/cm  100 130 160 190 210 290 340 400 450 IEC 60626-2
Tensile strength transversal  N/cm  70 100 140 170 200 300 420 350 400 IEC 60626-2
Typical electrical properties
Property Unit of measure                   Test method 
Nominal thickness  mm  0.13 0.16 0.18 0.22 0.24 0.31 0.37 0.41 0.47  
Dielectric strength  kV  6 9 12 14 16 22 25 26 28 IEC 60626-2