SynTherm® – Insulating Materials Mylar® A

Mylar® A is a polyethyleneterephthalate-based transparent, flexible polyester film which becomes cloudy with increasing thickness.

Mylar® A provides the electrical industry with unique design and construction options due to the outstanding balance of its electrical properties in combination with chemical, thermal and physical properties. The polyester film is characterised by its excellent resistance to moisture and common solvents. It can be used at temperatures of -70 °C to 150 °C. Since it does not contain any softening agents, it does not become brittle with age when used in normal conditions.

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Application

According to the manufacturer’s specifications, Mylar® A is used in Class B (130 °C) systems by numerous manufacturers of electric motors. Mylar® A is used as slot insulation, phase insulation and wedges for motors and generators. Mylar® A is used as core, interlayer and final insulation for transformers, chokes and relays.

Standards

  • UL approved, file no. E93687
  • RoHS compliant according to 2011/65/EU

Delivery forms

Film thicknesses in µm:
19, 23, 36, 50, 75, 100, 125, 190, 250, 300, 350, 500

Mylar® A can be supplied:

  • in slit rolls from widths of 6 mm  (depending on thickness)and above.
  • in rolls up to a width of 1,600 mm.


Overall diameter of the slit rolls/ rolls approx. 240/ 330 or 450 mm
Core inner diameter 76 mm, 152 mm.

Feathering:

  • depth approx. 1 - 12 mm, distance approx. 1 - 10 mm
  • from widths of 10 to 240 mm and thickness of 0.125 mm

Base

Polyethyleneterephthalate

Technical data

Mechanical
Property Unit of measure                         Test method 
Total thickness  µm  19* 23 36 50 75 100 125 190 250 300 350 500  
Tensile strength longitudinal  N/mm²  196 210 220 190 190 190 190 190 190 190 190 150 ASTM D 882
Tensile strength transversal  N/mm²  254 230 260 230 230 230 230 220 200 200 190 170 ASTM D 882
Elongation at break longitudinal  125 120 120 140 140 140 140 190 210 210 240 270 ASTM D 882
Elongation at break transversal  80 100 100 100 100 100 100 140 170 180 200 240 ASTM D 882
Shrinkage (30 min at 150 °C) longitudinal    1.5 2 1 1 1 1 1.3 1 1.3 1.3 0.9 ASTM D 1204
Shrinkage (30 min at 150 °C) transversal    0.8 2 1 1 1 1 1.3 0.5 1.3 1.3 0.9 ASTM D 1204
Shrinkage (30 min at 200 °C) longitudinal    4.5 7.5 3 3 3 3 3.5 3.5 3.5 3.5 2.0 ASTM D 1204
Shrinkage (30 min at 200 °C) transversal    3 7.5 3 3 3 3 3.3 2.3 3.5 3.3 1.7 ASTM D 1204

*=DuPont Teijin Film U.S., Ltd. Partnership: Melinex® S

Electrical
Property Unit of measure                         Test method 
Total thickness  µm  19* 23 36 50 75 100 125 190 250 300 350 500  
Dielectric strength  kV  6.1 4 5.5 7.7 10 11.75 13.5 17.5 19 19.5 20 20 ASTM D149

*=DuPont Teijin Film U.S., Ltd. Partnership: Melinex® S