MIL-C-27500 Type TE-14 ETFE-XLETFE Shielded Cables - M27500 Type TE-14 Rubber Insulation Specifications


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Fluoropolymer Insulations


These ratings are based on average performance of general purpose compounds. Any given property can usually be improved by the use of selective compounding.
    P = POOR  G = GOOD   F = FAIR
    E = EXCELLENT  O = OUTSTANDING
FEP ETFE-XLETFE
(ETFE)
TFE SOLEF/KYNAR
(PVDF)/PVF
HALAR
(E-CTFE)

Oxidation Resistance O E O O O
Heat Resistance O E O O O
Oil Resistance O E E - O E O
Low Temperature Flexibility O E O F O
Weather, Sun Resistance O E O E - O O
Ozone Resistance E E O E E
Abrasion Resistance E E O E E
Electrical Properties E E E G - E E
Flame Resistance O G E E E - O
Nuclear Radiation Resistance P - G E P E E
Water Resistance E E E E E
Acid Resistance E E E G - E E
Alkali Resistance E E E E E
Gasoline, Kerosene, Etc.
(Aliphatic Hydrocarbons) Resistance
E E E E E
Benzol, Toluol, Etc.
(Aromatic Hydrocarbons) Resistance
E E E G - E E
Degreaser Solvents
(Halogenated Hydrocarbons) Resistance
E E E G E
Alcohol Resistance E E E E E
Underground Burial E E E E E


SUMMARY OF PROPERTIES - EXTRUDED FLUOROPOLYMERS
Description: Extruded fluoropolymers are designed for high temperature, harsh and tough environmental use. The table below lists the generally accepted summary of electrical, mechanical and thermal properties of the four fluoropolymer resins which are commonly used in the fabrication of tubing and unique wire insulations.
PROPERTIES RESINS
PTFE/TFE FEP PFA ETFE-XLETFE
ULTIMATE TENSILE
STRENGTH, PSI
(ASTM D638)
2,500 - 4,000 (23°C)
1,500 (250°C)
3,000 - 4,000
(23°C)
4,000(23°C)
2,000 (250°C)
6,500 - 7,000
(23°C)
ULTIMATE
ELONGATION, %
(ASTM D368)
225 - 450 (23°C)
350 (250°C)
300 (23°C) 300 (23°C)
510 (250°C)
100 - 300 (23°C)
COEFFICIENT
OF FRICTION
(DYNAMIC)
0.10 0.25 0.20 0.40
FLEXURAL, MODULUS,
PSI X 10(3)
(ASTM D798)
50 TO 90 (23°C)
4 (250°C)
90 TO 105 (23°C) 100 (23°C)
10 (250°C)
200 (23°C)
IMPACT STRENGTH
NOTCHED IZOD, FT. LB/IN.
(ASTM D256)
3 (23°C)
>6 (77°C)
1.5 (-79°C)
No Break (23°C)
2.9 (-54°C)
No Break (23°C) No Break (23°C)
2.9 (-54°C)
CONTINOUS USE
TEMPERATURE (°C)
260 204 Over 260 150
HEAT DEFLECTION TEMP
66 PSI, (°C)
(ASTM D648)
122 70 74 104
SPECIFIC
GRAVITY
(ASTM D792)
2.11 - 2.19 2.12 - 2.17 2.12 - 2.17 1.70
DIELECTRIC STRENGTH
(ASTM D149) SHORT TERM
VOLTS/MIL 10 MLS
>1,400 >2,000 >2,000 >2,000
DIELECTRIC
CONSTANT
(ASTM D150)
2.05 ± 0.05 from
10(2) to10(10)Hz
2.1 from
10(2) to10(8)Hz
2.1 from
10(2) to10(6)Hz
2.6 from
10(2) to10(6)Hz
MELTING POINT (°C) 327± 11 253 - 282 302 - 310 271

Insulation
Types
Advantages
Disadvantages
FEP
PTFE
TFE
  • Excellent high temperature properties.  PTFE is preferred for solder applications.  FEP is preferred for jacket material. 
  • Non-flammable 
  • Good outgassing characteristics
  • Most flexible of all insulations
  • Good weatherability, resists moisture absorption and atomic oxygen erosion
  • Susceptible to cold flow when stressed (bent) over tight radius or when laced too tightly. 
  • Degraded by solar radiation above 5 x 105 RADS. 
  • FEP has poor cut through resistance
  • Heaviest insulation
ETFE
(ETFE-XLETFE)
  • Withstands physical abuse during and after installation 
  • Good high and low temperature properties 
  • High flex life 
  • Good outgassing characteristics
  • Fair cold flow properties
  • Some ETFE insulations fail flammability in a 30% oxygen environment 
  • Insulation tends to soften at high temperature
  • Degraded by gamma radiation above 106 RADS
Crosslinked ETFE
(ETFE-XLETFE)
  • Higher strength than normal ETFE 
  • Resistant to cold flow and abrasion 
  • More resistant to radiation effects
    (to 5 x 107 RADS)  
  • Higher maximum temperature than normal ETFE 
    • Tin Coating = 150°C Max. 
    • Silver Coating = 200°C Max. 
  • Good outgassing characteristics
  • Some ETFE insulations fail flammability in a 30% oxygen environment
  • Less flexible than extruded ETFE
  • More difficult to work with than PTFE
Aromatic Polyimide
(Polyimide Resin)
  • Lightest weight wire insulation material.  Commonly used with FEP or PTFE to form layered insulation tapes 
  • Excellent physical thermal and electric properties.  Excellent cut-through resistance and cold flow resistance 
  • Excellent radiation resistance  (to 5 x 109 RADS)  
  • Good outgassing characteristics
  • Inflexibility - difficult to strip. 
  • Absorbs moisture.  Degraded by atomic oxygen.  Poor weatherability
  • Prone to wet-arc and dry-arc tracking from abrasions and cuts
  • More difficult to flex
  • Not stable to ultraviolet radiation
Crosslinked
Polyalkene
  • Dual extrusion which is fused by sintering.  Combines excellent abrasion and cut through resistance of Polyvinylidene Fluoride (PVDF, PVF2-Penwalt Corp. TM Kynar) with Polyolefin for greater flexibility and improved heat resistance.  Polyalkene is used mainly as a primary insulation under an outer jacket such as crosslinked ETFE or crosslinked PVDF/PVF2 
  • High dielectric constant, used in high voltage applications 
  • PVDF has good radiation resistance  (to 108 RADS)  
  • More resistant to cold flow
  • Good outgassing characteristics
  • Lower maximum conductor temperature rating 
    • (135°C for GSFC S-311-P-13) 
    • (150°C for MIL-W-81044) 
  • Reduced flexibility
Silicon Rubber
  • Excellent flexibility at low temperatures
  • Excellent high voltage corona resistance
  • Good radiation resistance (to 108 RADS)
  • Good cold flow resistance
  • Poor cut through resistance, mechanical toughness, and fluid resistance
  • Must be processed for outgassing control
  • Flammable
  • No standard silicon rubber insulated wire or cable 





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