FEP Film

FEP Film

FEP Film Properties

• Excellent chemical resistance in corrosive environments
• Excellent peeling performance
• Low dielectric constant and dissipation
• Continuous use temperature is 400°F (205°C), suitable for low and high temperature applications
• Superior dielectric and electrical insulation properties
• UV stability, long-term performance in outdoor applications
• Processability, such as heat sealing, thermoforming, welding and thermal bonding

Table 1. FEP film properties

	Melting point	Maximum continuous service temperature	Heat resistance	Chemical resistance	Mechanical strength	Weatherability	Non-stick Water contact angle	Flame retardance	Transparency
FEP	270℃	205℃	A	A	B	A	114°	94V-0	A

Common Application Scenarios

• Corrosion resistant lining
• Aircraft release agent
• Printed circuit board
• Electret condenser microphone

Research Applications

• With the advancement of space exploration, satellites must have long-term reliability in harsh space environments involving vacuum, heat, high-energy charged particles, plasma, and sunlight. Therefore, the surface area of the satellite needs to be covered with thermal control materials to protect the electrical and installed electronic equipment from the high-temperature vacuum environment. FEP film can be used as a thermal control material and as an insulating material for the exterior of a spacecraft. These materials are exposed to the charged particle environment around the spacecraft, and then due to the charged particles, the charging of these materials is likely to cause surface discharge. Studies have shown that in the dependence of the charging potential on the electron energy, it is found that the electron energy when charging does not occur is about 2.7 keV, which seems to be the energy when the secondary electron emission yield becomes uniform. This indicates that electron irradiation of FEP film with energy lower than 2.7 keV induces positive charging.

Figure 1. Electron energy dependence of FEP membrane surface potential [1]

• After surface modification, FEP film can be used for culturing neuron research. Central nervous system (CNS) neurons do not regenerate spontaneously after injury. However, CNS neurons can regenerate in peripheral nerve grafts or in an environment that mimics peripheral nerves. In order to mimic the contact-mediated attraction cues of the axon response, FEP was used to prepare a surface with well-defined chemistry and topography. Since FEP is chemically inert, it can introduce functional groups to a defined depth with minimal or no impact on the surface morphology. Embryonic hippocampal neurons cultured on surface-modified FEP films showed enhanced interaction and axonal extension. Compared with a surface modified with one peptide type, a FEP surface modified with a 1:1 mixture of YIGSR and IKVAV peptides promoted more neurites and longer neurites per cell.

Figure 2. Number of neurites extending in each hippocampal neuron (E18) cultured in serum-free medium for different modified FEP surfaces [2]

References

1. Haruhisa Fujii, Teppei Okumura, Masato Takahashi, Electrical Engineering in Japan 188 (2014) 9-17.
2. Y.W. Tong, M.S. Shoichet, Biomaterials 22 (2001) 1029-1034.

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