What are FEP protective screens?
FEP (perfluoroethylene propylene) protective screens are used to protect sight glass plates from aggressive chemical influences. They are particularly suitable for media with high pH values and provide a good view of the underlying process medium due to their transparency. FEP is similar to PTFE in its material properties but is more translucent and allows for safe applications at temperatures up to 200 °C.
Specifications of FEP protective screens
Product specification: Protective screens
Material: FEP (Perfluoroethylene propylene)
Durabilities and further information can be found in our information datasheet.
FEP protective screens can be used when the sight glass plates, for example made of Borosilicate glass, are exposed to strong chemical stress. At increased pH levels, such as in lyes with a pH of 14, sight glass plates made of Soda-lime glass or Borosilicate glass are no longer recommended for safe and long-lasting operation. For safety and cost reasons, the use of FEP protective screens is suitable here.
FEP is very similar to PTFE in material properties. The most significant difference lies in the transparency. Depending on the thickness, FEP is transparent to milky blue. Due to its good light permeability, a process medium behind it can be well recognized. By using a FEP protective screen, the aggressive process medium behind it cannot attack the pressure-bearing sight glass plate.
The transparency of FEP protective screens varies depending on the thickness. In all delivery thicknesses, the process medium is always clearly visible. The application case determines the thickness of the FEP protective screen.
Operating Conditions:
Temperature: up to 200 °C
Pressure: depending on the application area
Technical Information:
Modulus of elasticity: 30 N/mm²
Thermal conductivity at 23 °C: 0.25 W/(m·Kg)
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