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Fluoro Polymers

General Properties : Fluoropolymers are a unique class of macromolecules with unmatched thermal, electrical, chemical as well as mechanical properties. These remarkable features of fluorocarbon polymers are attributed to its very high bond energy between carbon and fluorine atom. Moreover, the high performance of fluoropolymer is extended over a wide temperature range from extremely low to extremely high. Special features of fluoropolymers are:

  • Electrical Reliability: A low dielectric constant and dissipation factor and high dielectric strength over a wide range of frequencies and temperature.

  • Chemical Inertness: Excellent resistance to almost all chemicals, an excellent water and oil repellant for non-stick character.

  • Mechanical Strength: Outstanding durability and fatigue resistance, excellent resistance to abrasion and cut through.

  • Excellent Thermal Stability: Excellent upper and lower service temperature, retention of properties after heat ageing is excellent over a wide temperature range (-200°C + 200°C).

  • Long-term Weatherability: Excellent resistance to ozone, sunlight and weather.

  • Non Flammability: Will not burn in atmosphere, very high oxygen index, and low flame spread and smoke generation.

The inherent characteristic of fluoropolymers (Table-1) enables a cable designer to manufacture cables with the following outstanding features:

i) Small size, lighter in weight and much higher performance reliability
ii) Suitable for wide frequency range and over wide temperature range (-200°C + 200°C)
iii) Flame resistant
iv) Soldering iron resistant and suitable for high density wiring
v) Resistance to ultraviolet radiation and stress cracking
vi) Resistance to hazardous environments especially at elevated temperatures.

Technical Cell : NICCO Fluoropolymer Cable is available with wide range of flexibility in designs to meet customers need and its special applications. NICCO technical service provides you the latest know-how for selecting a high performance reliable cable for very specialized application.

General Properties of Fluoropolymers

  FEP PFA ETFE PVDF PTFE ECTFE
A Property
  1. Continuous Service temp. °C 200 250 150 135 250 150
2. Melting Point °C 265±15 305-310 265-275 168-180 327 240
3. Specific Gravity (gm/cc) 2.15 2.15 1.7 1.76 2.15 1.68
B Mechanical Properties
  1. Tensile Strength(N/MM2) 21.0 28.0 45.5 50 24.5 42-48
2. Elongation at Break (%) 300 300 200 300 350 175
3. Shore Hardness (ShD) 55 60 75 80 60 90
C Electrical Properties
  1. Volume Resistivity (Ohm-Cm.) 1018 1018 1016 1014 1018 1016
2. Dielectric Constant 2.1 2.1 2.6 8.0 2.1 2.3
3. Dissipation Factor 0.001 0.0004 0.005 0.010 0.0002 0.001
4. Dielectric Strength Short time
V / mil, D-140, 0.25 mm.		 2100 2000 1400 880 2000 1400
D Chemical Properties
  Attacked by :- Molten or Dissolved metals, Fluorine, Fcl3 at elevated temp. Fuming H2SO4 and similar agents Fuming Nitric Acid and Sulphuric Acid, Amines, Pyridine Like FEP and PFA None
E Moisture Absorption -------------- Less than 0.1%
F Flammability
  Oxygen Index 95 95 32-37 44-48 95 64
G Resistance to Weathering --------------- No effect ---------------
PFA Copolymer of Polytetra fluoroethylene & perfluoro alkyl vinyl ether
FEP Copolymer of tetra fluoroethylene & hexa fluoroethylene
ETFE Copolymer of tetra fluoroethylene and ethylene
PVDF Polyvinylidene fluoride
PTFE Poly-tetra fluoroethylene
ECTFE Copolymer of Chloro-tri-fluoroethylene and ethylene

Application & Market : Owing to the wide range of flexibility in the properties of fluoropolymers there is considerable overlap in the application of various fluorinated polymer resins. Where more than one member of the family of fluoropolymer meet the properties of the end product, the cost of the finished product dictates the choice of the raw-material.

Some general application areas are:

  • Electronics: Hook-Up Wire; wire wrap connection; electronic equipments for aircraft, radar,
    navigation, data cable, radio frequency cables.

  • Industry: Thermocouple extensions; motor and generator leads, hook-up wires, solid state
    control instruments, heater cables and lead cables for high temperature zones.

  • Power Station: High radiation areas such as nuclear power stations.

  • Exploration: Oil-rigs; electro-logging cables.

  • Defence: Air-craft wiring, wiring of battle tanks.

  • Transportation: Sub-way-Metro railway installations

  • Civic Construction: High-rise buildings.

 
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