DuPont Teijin Films Melinex® 238 Polyester Film

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DuPont Teijin Films Melinex® 238 Polyester Film
Categories:	Polymer; Film; Thermoplastic; Polyester, TP; Polyester Film
Material Notes:	Melinex® 238 is a translucent white polyester film used for electrical insulation. It has been specially developed for use as an electrical insulation material in rotating electrical machines. It is available in a range of thicknesses between 300 and 1400 gauge. This is a low oligomer film suitable for hermetic motor applications where oligomer extraction needs to be limited. Information provided by DuPont.
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Physical Properties	Original Value	Comments

Density	1.40 g/cc	ASTM D1505
Water Absorption	0.55 % @Temperature 23.0 °C, Time 605000 sec	ASTM D570-63

Mechanical Properties	Original Value	Comments
Film Elongation at Break, MD	150 %	ASTM D882A
Film Elongation at Break, TD	130 %	ASTM D882A
Coefficient of Friction, Static	0.30	ASTM D1894
Film Tensile Strength at Break, MD	29900 psi	ASTM D882A
Film Tensile Strength at Break, TD	31300 psi	ASTM D882A

Electrical Properties	Original Value	Comments
Volume Resistivity	1.00e+15 ohm-cm @Temperature 25.0 °C, Time 100 sec	100 VDC
Surface Resistivity per Square	>= 1.00e+13 ohm	500 V DC @ 54%; ASTM D257
Dielectric Strength	1857 V/mil @Thickness 0.356 mm, Frequency 50 Hz	continuously increasing at 500 V/sec, 6.3 mm electrodes
	2300 V/mil @Thickness 0.254 mm, Frequency 50 Hz	continuously increasing at 500 V/sec, 6.3 mm electrodes
	2500 V/mil @Thickness 0.193 mm, Frequency 50 Hz	continuously increasing at 500 V/sec, 6.3 mm electrodes
	3200 V/mil @Thickness 0.127 mm, Frequency 50 Hz	continuously increasing at 500 V/sec, 6.3 mm electrodes
Dielectric Breakdown	16000 V @Thickness 0.127 mm	50 Hz continuously increasing at 500 V/sec, 6.3 mm electrodes
	19000 V @Thickness 0.193 mm	50 Hz continuously increasing at 500 V/sec, 6.3 mm electrodes
	23000 V @Thickness 0.254 mm	50 Hz continuously increasing at 500 V/sec, 6.3 mm electrodes
	26000 V @Thickness 0.356 mm	50 Hz continuously increasing at 500 V/sec, 6.3 mm electrodes

Descriptive Properties
Oligomer Extraction	0.006	24 hrs boiling Xylene

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PDTZ9017 / 139423

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