ETFE is a melt-processable fluoroplastic that can be extruded and molded like thermoplastics. The full English name is Ethyl tetrafluoroethylene copolymer, usually abbreviated as ETFE (F-40). The thickness of ETFE film is between 0.20mm to 0.60mm, and it is a transparent film.

ETFE film has the following characteristics:

1. ETFE film is an excellent substitute material for transparent building structures. Its unique self-cleaning surface makes it highly resistant to dirt and easy to clean. Usually, rainwater can remove the main dirt.

2. ETFE film has the characteristics of anti-aging, corrosion resistance, long life and so on. The general service life is 25-35 years.

3. ETFE film is light in weight, high in fire resistance, and will not drip when burning.

4. The light transmittance of ETFE film is high, and the light transmittance of ETFE film can reach more than 90%.

With environmental recyclability, ETFE membrane can be recycled and reused to produce other ETFE products.

The main stadium of the 2008 Beijing Olympic Games, the swimming pool, chose this film as the roofing material. ETFE film can not only be used as a film for construction, but also has been used as a encapsulating material for flexible photovoltaic industry. Because it is a fluoroplastic, although it has many of the above advantages, it is as big as PTFE (polytetrafluoroethylene) in that it is extremely hydrophobic, has low surface energy, poor wettability, and can hardly be bonded. Through plasma surface treatment, polar groups can be introduced on the surface of the substrate without damaging the excellent properties of the substrate body and reducing the light transmittance, improving the surface energy and wettability, and achieving good bonding with EVA. Compared with surface treatment methods such as strong acid and alkali, strong oxidant treatment, flame treatment, mechanical sanding, etc., plasma treatment is the only feasible method. At the same time, the side facing the atmosphere is not treated and retains its strong hydrophobicity, so that the falling raindrops cannot stay on the surface and roll down quickly without leaving water marks on the surface. At the same time, since the dust falling from the atmosphere is mostly inorganic substances, water has good wettability to it, so the rolling water droplets will collect the dust into the water droplets and roll down together, realizing the self-resistance of the surface of the photovoltaic cell similar to the lotus leaf. cleaning action.