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.
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
| 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 | 215 | 215 | 215 | 215 | 215 | 205 | 195 | 195 | 175 | 175 | ASTM D882 |
| Tensile strength transversal | N/mm² | 265 | 275 | 265 | 265 | 265 | 265 | 245 | 245 | 245 | 195 | 195 | ASTM D882 |
| Elongation at break longitudinal | % | 150 | 130 | 150 | 150 | 150 | 150 | 150 | 180 | 190 | 210 | 230 | ASTM D882 |
| Elongation at break transversal | % | 95 | 90 | 100 | 110 | 110 | 100 | 110 | 125 | 135 | 150 | 165 | ASTM D882 |
| Shrinkage (30 min at 150 °C) longitudinal | % | 1.5 | 1.4 | 1.3 | 1.3 | 1.3 | 1.2 | 1.2 | 1.2 | 1.2 | 1.1 | ASTM D 1204 | |
| Shrinkage (30 min at 150 °C) transversal | % | 0.8 | 0.5 | 0.5 | 0.5 | 0.5 | 0.8 | 0.8 | 0.8 | 0.6 | 0.6 | ASTM D 1204 | |
|
*= Melinex® S |
|||||||||||||
| 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 | 20 | 21 | ASTM D149 |
|
*= Melinex® S |
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