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DuPont Teijin Films Mylar® MO21 Polyester Film, 900 Gauge
Categories: Polymer; Film; Thermoplastic; Polyester, TP; Polyester Film

Material Notes: Product Description: Mylar® type MO21 films are strong, heavy gauge films that have excellent electrical properties. These films offer exceptional cut-through resistance, low shrinkage, low moisture absorption, and high thermal durability. Mylar® type MO21 films are used as insulation in systems that have been given Class B ratings by Underwriters Laboratories (UL). They also offer product uniformity that enhances processing on automatic slot and wedge insertion equipment.

The inherit mechanical durability of Mylar® type MO21 films and their good dielectric and thermal durability characteristics endow these films with multiple advantages in motors and generators.

Typical Applications: Mylar® type MO21 films are being widely used for electrical insulation in slot liners, wedges and phase insulation for motors and generators. Mylar® type MO21 films are also frequently used in hermetic motor/compressor sealed units, fractional horse power motors, diaphragms, and industrial laminations.

Approvals: UL 94 VTM-2 - for 92-1400 gauge (0.023-0.35mm). UL Recognition - for 92-500 gauge (0.023-0.35 mm) HWI=5, HAI=4, CTI=1; for 700-1400 gauge (0.18-0.35mm) HWI=4, HAI=0, CTI=1

Information provided by DuPont.

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Physical PropertiesOriginal ValueComments
Density 1.392 g/cc
Thickness 9.00 mil
 
Mechanical PropertiesOriginal ValueComments
Film Elongation at Break, MD 150 %ASTM D882A
Film Elongation at Break, TD 130 %ASTM D882A
Film Tensile Strength at Break, MD 27000 psiASTM D882A
Film Tensile Strength at Break, TD 29000 psiASTM D882A
 
Electrical PropertiesOriginal ValueComments
Dielectric Strength 2044 V/mil1/4" electrode 500 V/sec 25°C in air; ASTM D149
Dielectric Breakdown 18400 V1/4" electrode 500 V/sec 25°C in air; ASTM D149
Comparative Tracking Index 400 - 600 V
Hot Wire Ignition, HWI 7.0 - 15 sec
High Amp Arc Ignition, HAI >= 120 arcs
 
Thermal PropertiesOriginal ValueComments
Specific Heat Capacity 1.17 J/g-°CTypical Mylar®
Melting Point 254 °CTypical Mylar® via DSC
Shrinkage, MD 1.6 %
@Temperature 150 °C,
Time 1800 sec
Unrestrained
Shrinkage, TD 1.1 %
@Temperature 150 °C,
Time 1800 sec
Unrestrained
 
Optical PropertiesOriginal ValueComments
Refractive Index 1.64 - 1.67typical of Mylar®
Optical Density 41
 
Descriptive Properties
Yield (nominal)2200 in2/lb

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to go back to viewing the property data in MatWeb's normal format.

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