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Fluorinated polymeric materials: PTFE, FEP, PFA, ETFE

The chemical resistance of polymers with high fluorine content is exceptionally high. The electrical insulating and dielectric properties of these materials are also very good.

Fluorpolymere Materials: HELUFLON®-PTFE, HELUFLON®-FEP, HELUFLON®-PFA, HELUFLON®-ETFE
• HELUFLON®-PTFE - Polytetrafluorine-ethylene (5Y)
• HELUFLON®-FEP - Tetrafluoroethylene -perfluoropropylene -copolymer (6Y)
• HELUFLON®-PFA - Tetrafluoroethylene -perfluoroalkoxy -copolymer (51Y)
• HELUFLON®-ETFE - Ethylene-tetra-fluorine-ethylene -copolymer (7Y)

Fluorine-polymers are resistant against nearly all known chemical compounds.
Fluorine-polymer has a smooth surface of extremely low surface tension which is why virtually nothing adheres to this material.
Fluorine-polymer is moisture rejecting, doesn’t swell and is not be damaged by welding.
Fluorine-polymer is used, where conventional material wouldn’t resist the environmental conditions.
Fluorine-polymer is applied in the civil and military sector as well as in the aviation- and aerospace technology.

Fluorine-carbon-resins have following important characteristics:
- high heat-resistance during permanent operation
   - HELUFLON®-FEP          up to 250°C
   - HELUFLON®-PTFE        up to 260°C
- outstanding resistant against dielectric strength
- constant dielectric characteristics
- no moisture absorption
- resistant against nearly all chemical products
- insensitive temperature fluctuations
- good mechanical characteristics, no formation of cracks, wear-resistant
- low coefficient of friction
- light resistant (also UV)

Characteristics:
Insulation Material ETFE FEP PTFE PFA
Material Initial Code 7Y 6Y 5Y 51Y
Nominal Temperature in °C
(permanent - approx. 25000h)
- 100
+ 150
- 100
+ 205
- 190
+ 260
- 190
+ 260
Nominal Temperature in °C (temporary) + 180 + 230 + 300 + 280
Break-down Temperature, Melting Point (°C) + 270 + 290 + 327 + 310
Dielectric Number at 60 Hz (20°C) 2.6 2.1 2.0 2.1
Density 10³ kg/m³ (20°C) 1.70 2.15 2.18 2.20
Specific Resistance Ohm x cm (20°C) 1016 1018 1018 1016
Break-down Resistance kV/mm (20°C) 36 25 20 25
Tension MPa (20°C) 45 20 - 25 35 - 45 30
Breaking Point % (20°C) 150 - 300 250 - 300 350 - 400 300
Porosity % (20°C) 0.02 0.01 0.01 0.01
Environmental Resistance very good very good very good very good
Flammability not flammable not flammable not flammable not flammable
Resistance to Chemicals very good very good very good very good
Radiation Resistance 1) x 104 GY 200 0.02 0.02 0.02
1) Values shown include high dosage and ca. 50% rest smoldering values

Insulation and jacket type abbreviations

DIN/VDE Material
7Y ETFE
6Y FEP
5Y PTFE
51Y PFA
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