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

Delivery forms

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

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
Tensile strength longitudinal N/mm² 196 220 200 200 210 200 240 190 190 175 180 ASTM D882A
Tensile strength transversal N/mm² 265 270 250 250 260 250 200 240 220 205 200 ASTM D882A
Elongation at break longitudinal % 150 120 140 145 130 130 145 175 195 220 240 ASTM D882A
Elongation at break transversal % 95 90 90 100 80 85 85 110 125 145 155 ASTM D882A
Shrinkage (30 min at 150 °C) longitudinal % 1.9 1.5 1.4 1.3 1.2 1.3 1.1 1.2 1.2 1.1 ASTM D 1204
Shrinkage (30 min at 150 °C) transversal % 1.2 0.6 0.7 0.6 1.0 1.2 1.1 0.9 0.7 0.7 ASTM D 1204

*= Melinex® S
Electrical
Property Unit of measure Test method
Total thickness µm 19* 23 36 50 75 100 125 190 250 300 350
Dielectric strength kV 6.1 4 5.5 7 10 11.8 13.5 17.5 19 22.01 22.01 ASTM D149

*= Melinex® S