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PRODUCT DATA of PETP
MaterialPETP
Product TypeThermoplastic film.
Chemical CompositionPolyethylene Terephthalate.
Name of ManufacturerSeveral (DuPont USA, ICI UK, La Cellophane France, ...)
EXPERIENCE IN PRACTICE
Development StatusCommercial Product
Cost RangeVery Low
Lot ReproducibilityExcellent
Equivalent DesignationsPET, PETE, Dacron, Terylene, Lavsan, Mylar, Melinex, Terphane,
Space ExperienceExtensive
PHYSICAL PROPERTIES
Specific Gravity1.4
ELECTRICAL PROPERTIES
Electrical Volume Resistivity1e16 ohm.m
Dielectric Constant3.2
Remark: 50 Hz, 25°C
Dielectric Strength280 kV/mm
Dissipation Factor0.002
Remark: 50 Hz, 25°C
THERMAL PROPERTIES
Thermal Conductivity0.51 W/m.K
Thermal Expansion Coefficient30 μstrain/°C
Specific Heat1.3 J/g.K
OPTICAL PROPERTIES
Refractive Index1.64
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
UV RadiationUnstable
FlammabilityBurnt
Test: NASA NHB 8060-1B
Toxicity/OffgassingPass
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 Index31
Test:ECSS-Q-70-21
Water Absorption0.006
Test:Immersion
SPECIAL RECOMMENDATIONS
Special RecommendationsAluminised 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.