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SynTherm® – Insulating Materials

Mylar® A

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

Attributes

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
RoHS compliant according to 2011/EC

Delivery forms

Film thicknesses in µm:
23, 36, 50, 75, 100, 125, 190, 250, 300, 350, 480

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
Total thickness  Tensile strength longitudinal  Tensile strength transversal  Elongation at break longitudinal  Elongation at break transversal  Shrinkage (30 min at 150 °C) longitudinal  Shrinkage (30 min at 150 °C) transversal  Shrinkage (30 min at 200 °C) longitudinal  Shrinkage (30 min at 200 °C) transversal 
Unit of measure                       Test method 

µm

 

23

 

36

 

50

 

75

 

100

 

125

 

190

 

250

 

300

 

350

 

500

 
 

N/mm²

 

210

 

220

 

190

 

190

 

190

 

190

 

190

 

190

 

190

 

190

 

150

 

ASTM D 882

 

N/mm²

 

230

 

260

 

230

 

230

 

230

 

230

 

220

 

200

 

200

 

190

 

170

 

ASTM D 882

 

%

 

120

 

120

 

140

 

140

 

140

 

140

 

190

 

210

 

210

 

240

 

270

 

ASTM D 882

 

%

 

100

 

100

 

100

 

100

 

100

 

100

 

140

 

170

 

180

 

200

 

240

 

ASTM D 882

 

%

 

1.5

 

2

 

1

 

1

 

1

 

1

 

1.3

 

1

 

1.3

 

1.3

 

0.9

 

ASTM D 1204

 

%

 

0.8

 

2

 

1

 

1

 

1

 

1

 

1.3

 

0.5

 

1.3

 

1.3

 

0.9

 

ASTM D 1204

 

%

 

4.5

 

7.5

 

3

 

3

 

3

 

3

 

3.5

 

3.5

 

3.5

 

3.5

 

2.0

 

ASTM D 1204

 

%

 

3

 

7.5

 

3

 

3

 

3

 

3

 

3.3

 

2.3

 

3.5

 

3.3

 

1.7

 

ASTM D 1204

 
Electrical
Total thickness  Dielectric strength 
Unit of measure                       Test method 

µm

 

23

 

36

 

50

 

75

 

100

 

125

 

190

 

250

 

300

 

350

 

500

 
 

kV

 

4

 

5.5

 

7.7

 

10

 

11.75

 

13.5

 

17.5

 

19

 

19.5

 

20

 

20

 

ASTM D149

 

Mylar®, Melinex® sind eingetragene Marken von DuPont Teijin Film U.S., Ltd. Partnership.