While maintaining the good heat resistance, chemical resistance and electrical insulation properties of PTFE, ETFE has greatly improved its radiation resistance and mechanical properties, and its tensile strength can reach 50MPa, which is close to 2 times that of PTFE.
ETFE is a tough material with a good balance of mechanical properties - strong tear resistance, high tensile strength, medium hardness, excellent impact resistance and long expansion life.
ETFE is a good dielectric material, high insulation strength, dielectric constant of 2.6, high resistivity, low dissipation factor, only 0.003. Its low dielectric constant is basically constant in the case of frequency and temperature changes.
The use of ETFE temperature range is more practical and wide, the constant temperature is usually set between -65C and +150°C, and it is still very hard at ultra-low temperatures, and its embrittlement temperature is as low as -100 °C.
In addition, ETFE has passed several rigorous fire resistance tests, such as IEEE 383, and is rated UL 94V-0. It has little effect on the physical properties of most chemical substances and has low permeability to ordinary gases and water gases.
Ethylene-tetrafluoroethylene copolymer film is a crystalline polymer with a melting point of 256~280℃. The ene can self-extinguish when burned. Its mechanical strength is high, low temperature impact resistance is the best in the existing fluorine plastics, from room temperature to -80C can have a high impact strength, chemical stability, electrical insulation and radiation resistance.
The actual use of ETFE film began in the 1990s, mainly as a covering material for agricultural greenhouses, various shaped buildings, such as sports stands, building cone roof, casino, revolving restaurant canopy, casino canopy, parking lots, exhibition halls and museums. The Garden of Eden, one of the British New millennium projects, has the reputation of "the eighth wonder of the world".
It consists of 4 dome-like buildings connected by the world's largest greenhouse, covered with a transparent cover made of ETFE film material, its mass is only 1% of the same area of glass, transparent sheet can be recycled, and has good insulation.
ETFE membrane is an alternative material of superior quality in transparent building structures and has proved to be a reliable and economical roofing material for many projects over the years with its many advantages.
The membrane is made of artificial high strength fluoropolymer (ETFE), and its unique anti-adhesion surface makes it highly resistant to dirt and easy to clean. Usually rain will remove the main dirt.
With a service life of at least 25-35 years, ETFE membranes are ideal for use in permanent multi-storey movable roof structures. The membrane material is mostly used for two or three layers of aerated support structures with a span of 4 meters, and the membrane span can also be increased according to the geometry and climatic conditions of special projects. Film length is easy to install as the standard, generally 15-30 meters. Small span single-layer structures can also be used in smaller sizes.
Depending on the position and surface printing, the transmittance of ETFE film can be as high as 95%. The material does not block the transmission of light such as ultraviolet rays to ensure the natural light inside the building. By surface printing, the semi-transparency of the material can be further reduced to 50%.
Depending on the geometry and the number of layers, the K value can be as high as 2.0W/m2K. The energy consumption index of a three-layer printing film, for example, can reach 0.77.
Due to its excellent quality, ETFE films require almost no daily maintenance. A simple inspection of the roof due to mechanical damage can be carried out (once a year is appropriate) and on-site repairs can be made as required. At the same time, the ventilation system can be checked and the filter can be replaced.
ETFE films are completely recyclable materials that can be reused to produce new membrane materials, or to separate impurities to produce other ETFE products.
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