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	PRODUCT DATA of PETP

Material	PETP
Product Type	Thermoplastic film.
Chemical Composition	Polyethylene Terephthalate.
Name of Manufacturer	Several (DuPont USA, ICI UK, La Cellophane France, ...)

	EXPERIENCE IN PRACTICE

Development Status	Commercial Product
Cost Range	Very Low
Lot Reproducibility	Excellent
Equivalent Designations	PET, PETE, Dacron, Terylene, Lavsan, Mylar, Melinex, Terphane,
Space Experience	Extensive

	PHYSICAL PROPERTIES

Specific Gravity

1.4

	ELECTRICAL PROPERTIES

Electrical Volume Resistivity	1e16 ohm.m
Dielectric Constant	3.2 Remark: 50 Hz, 25°C
Dielectric Strength	280 kV/mm
Dissipation Factor	0.002 Remark: 50 Hz, 25°C

	THERMAL PROPERTIES

Thermal Conductivity	0.51 W/m.K
Thermal Expansion Coefficient	30 μstrain/°C
Specific Heat	1.3 J/g.K

	OPTICAL PROPERTIES

Refractive Index

1.64

	RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY

UV Radiation	Unstable
Flammability	Burnt Test: NASA NHB 8060-1B
Toxicity/Offgassing	Pass Test: NASA NHB 8060-1A
Temperature Range(space)	-180 to +150°C Test:Long term
Outgassing	TML = 0.3%, RML = 0.1%, CVCM = 0.03% Test:ECSS-Q-70-02
Oxygen Index	31 Test:ECSS-Q-70-21
Water Absorption	0.006 Test:Immersion

	SPECIAL RECOMMENDATIONS

Special Recommendations

Aluminised films (1 or 2 faces) exist in the trade and are extensively used in space programmes since Al protects the plastic against destruction by unfiltered UV light. · Sizes available are down to 3microns thick and up to 300 cm wide, depending on the vendor. · Flammability depends on thickness and configuration. · PETP is etched by atomic oxygen in low earth orbit at a rate of approx. 3.4 x 10^-24 cm^3/atom.