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DuPont Teijin Films Mylar® MO21 Polyester Film, 750 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 1.3928 g/cc
Thickness 7.50 mil
 
Mechanical PropertiesOriginal ValueComments
Film Elongation at Break, MD 140 %ASTM D882A
Film Elongation at Break, TD 115 %ASTM D882A
Film Tensile Strength at Break, MD 27000 psiASTM D882A
Film Tensile Strength at Break, TD 30000 psiASTM D882A
 
Electrical PropertiesOriginal ValueComments
Dielectric Strength 2333 V/mil1/4" electrode 500 V/sec 25°C in air; ASTM D149
Dielectric Breakdown 17500 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 0.90 %
@Temperature 150 °C,
Time 1800 sec
Unrestrained
 
Optical PropertiesOriginal ValueComments
Refractive Index 1.64 - 1.67typical of Mylar®
Optical Density 38
 
Descriptive Properties
Yield (nominal)2600 in2/lb

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PDTZ9378 / 139698

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