enEnglisch
Pipe systems made of ECTFE - ethylene chlorotrifluoroethylene
Ethylene chlorotrifluoroethylene (ECTFE) is a thermoplastic fluoropolymer with a unique chemical structure. As a copolymer, it has an alternating arrangement of ethylene and chlorotrifluoroethylene. This material is particularly suitable for applications where extreme demands are made on chemical resistance under high temperatures (e.g. free chlorine in the medium and 98% sulfuric acid).
General properties of ECTFE:
- excellent chemical resistance also to free chlorine and ozone
- very good surface quality (low surface roughness)
- temperature resistant from - 70° C to 150° C (depending on the type of stress)
- good radiation resistance
- good mechanical properties
- high purity
- excellent abrasion resistance
- good weldability
Application areas of ECTFE:
- Semiconductor manufacturing
- Chemical plants
- Apparatus engineering
- Clean room applications
- (e.g. photovoltaics)
- Heat exchangers (e.g. in pickling plants and similar)
- Linings for steel or concrete tanks, concrete pipes as wastewater pipes for concentrated wastewater, for corrosion protection
Delivery program:
- Pipes
- Fittings for butt and IR welding
- Fittings also for fine dosing of chemicals
- Semi-finished products
- Welding technology
Advantages of using ECTFE pipes and fittings:
- easy installation due to the use of IR and butt welding
- suitable for use in many aggressive media
- flame retardant according to UL 94-V0
- delivery program of pipes and fittings available
Pressure table in bar for ECTFE (SDR 21) according to ISO 12162 with a safety factor of 1.6
| Temperature | d=25 (s=1,9) | d>63 |
|---|---|---|
| 20°C | 19,4 | 11,7 |
| 60°C | 9,9 | 6,0 |
| 80°C | 6,3 | 3,9 |
| 95°C | 4,3 | 2,6 |
The table presents selected dimensions as examples.
Behavior of ECTFE under radiation exposure
ECTFE has good resistance to UV and gamma radiation as
well as excellent aging resistance. Since it is a translucent material, the media are exposed to UV radiation.
Propagation of microorganisms on ECTFE
The surface of ECTFE is just as unfavorable a breeding ground for microorganisms as glass. This is the conclusion of an investigation carried out in the course of testing the HP suitability of ECTFE.
Chemical resistance of ECTFE
ECTFE has excellent resistance to most inorganic and organic chemicals, as well as to solvents. To date, no solvent is known to attack ECTFE below 120° C or
caused cracking. Only contact with chlorinated solvents causes minor swelling. ECTFE should not be used for molten alkali metals or hot amines (such as aniline, dimethylamine). A significant advantage compared to other thermoplastics is the chemical resistance of ECTFE to chlorine and chlorine compounds even at higher temperatures.
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