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What is PVDF material ?

PVDF is a homopolymer of vinylidene fluoride or a copolymer of vinylidene fluoride with other fluorinated vinyl monomers. It is a high-performance fluoropolymer material second only to polytetrafluoroethylene (PTFE), and is widely used in photovoltaic backsheets, aerospace, robotics, optical instruments, industry and etc. Among them,PVDF Material for Photovoltaic Backsheets application is particularly prominent.

In addition to possessing the excellent properties of PTFE, PVDF exhibits particularly outstanding rigidity, hardness, and creep resistance. Its processing and molding characteristics are significantly superior to PTFE.

Why choose PVDF Material for Photovoltaic Backsheets ?

The photovoltaic backsheet is the outermost layer of the photovoltaic module, used to protect the crystalline silicon wafers from moisture and oxygen corrosion. From the outside to the inside, the photovoltaic backsheet consists of: fluorine film (outer protective layer), adhesive, PET film, adhesive, and fluorine film (inner protective layer). The fluorine film primarily protects the PET film from ultraviolet radiation and wind erosion, slowing down the degradation rate of PET and extending the lifespan of the backsheet. Photovoltaic power plants are constantly exposed to  environments such as wind, sand, ultraviolet radiation, high temperatures and moisture, which require high standards for the protective materials.  

Typical Photovoltaic Backsheets Structure

PVDF material has glass transition temperature -39℃, embrittlement temperature -62℃, melting point 165~170℃,thermal decomposition temperature above 316℃, and long-term service temperature -40~150℃. It has outstanding characteristics include high mechanical strength,good radiation resistance, good chemical stability and not corroded by acids, alkalis, strong oxidants, or halogens at room temperature.

PVDF material is the second most widely used fluoroplastic, allowing for thermoplastic processing ,with a complete range of varieties and numerous suppliers. Whether its global supply, processing adaptability, weather resistance, or barrier properties, PVDF is the most suitable weather-resistant material for solar cell backsheets.

Conclusion

According to relevant statistics, PVDF Material for Photovoltaic Backsheets has a huge market scale, with a market share reaching 54% in 2019. Under the carbon neutrality background, the photovoltaic industry is experiencing rapid development, which will also drive a significant increase in PVDF demand.

Further information about PVDF grades and prices, please contact Uflon, which provide comprehensive solutions from material selection to technical support, helping customers improve product competitiveness.