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PRODUCT DATA of PTFE
MaterialPTFE
Safety DatasheetTeflon Advanced MSDS
Product TypeThermoplastic.
Chemical CompositionPolytetrafluoroethylene.
Name of ManufacturerSeveral (DuPont USA, Hoechst D, Montecatini I, etc.)
EXPERIENCE IN PRACTICE
Development StatusCommercial Product
Cost RangeMedium
Lot ReproducibilityExcellent
Equivalent DesignationsTeflon, Halon, Fluon, Hostaflon
Space ExperienceExcellent
PHYSICAL PROPERTIES
Specific Gravity2.15
ELASTIC PROPERTIES
Tensile Modulus0.42 GPa
ELECTRICAL PROPERTIES
Electrical Volume Resistivity1e16 ohm.m(minimum)
Dielectric Constant2.1
Remark:60 Hz
Dielectric Strength18.9 kV/mm
Dissipation Factor0.0002
Remark:60 Hz
THERMAL PROPERTIES
Thermal Conductivity0.25 W/m.K
Thermal Expansion Coefficient100 μstrain/°C
Specific Heat1 J/g.K
Remark:40°C approx.
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
FlammabilityPass (30% O2)
Test:NASA NHB 8060-1B
Toxicity/OffgassingPass
Test:NASA NHB 8060-1A
Temperature Range(space)Cryogenic to +260°C
Test:Long term
Outgassing(Avg data)TML = 0.05%, RML = 0.02%, CVCM = 0.0%
Test:ECSS-Q-70-02
Oxygen Index95
Test:ECSS-Q-70-21
SPECIAL RECOMMENDATIONS
Special RecommendationsPTFE has a strong tendency to creep and is unable to sustain constant high load. Creep may occur during thermal cycling. · All PTFE-insulated wires and cables tested up to now have been found acceptable for space use. · PTFE is rather sensitive to radiation and its use outside a spacecraft, particularly in high-radiation zones (Van Allen belts, geostationary orbit) requires special testing. · Volume change associated with a change of crystallinity occurs between approx. 22 to 27°C.