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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(Avg data)

TML = 0.3%, RML = 0.1%, CVCM = 0.03% Test:ECSS-Q-70-02

Oxygen Index

31 Test:ECSS-Q-70-21

Ionising Radiation

10 Mrad Test:Mechanical properties

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.