Solar Panel Encapsulant EVA Films for PV Module Encapsulation

Solar Module Lamination Film
JM EVA films are fast cure types, and widely used for encapsulating PV modules
1. Excellent anti-PID and anti-snail-trail ability.
2. Excellent durability, with good performance in DH & UVaging.
3.Good light transmittance and long-term retention, some model has higher light transmission in the UV wavelength area to allow greater power, some model is UV cut-off type model.
4. Outstanding material compatibility. Strong adhesive ability with glass, welding belt, cell, back sheet.
5. Film appearance thicker with special surface embossing, and easy to be operated and can shorten lamination time.
Technical Parameters of Solar Panel EVA film for Photovoltaic Encapsulation
EVA Encapsulant Characteristics |
Type |
Fast Cure |
Thickness |
0.5-0.6 mm |
Width |
≤970 mm |
Roll Length |
100-150 m |
VA Content |
28.5-30.5 % |
Density |
420 g/cm3 |
Gel Content |
≥75 % |
Film Stability Characteristics |
Tensile Strength |
25 Mpa |
Young's Modulus |
24 Mpa |
Peel Strength (Encapsulants-Backsheet) |
≥50 N/cm |
Thermal Shrinkage (Length / MD) |
≤4 % |
Thermal Shrinkage (Width / TD) |
≤1.5 % |
Volume Resistivity |
>1x10 ^14 Ω·cm |
UV Aging (Yellowish Index) |
≤5 △YI |
Damp-Heat Aging (Yellowish Index) |
≤5 △YI |
Optical & Thermal Characteristics |
Refractive Index |
90 |
EVA Film Processing Time |
Vacuuming Time |
3-4 min |
Lamination Time |
3-4 min |
Curing Temperature |
140-150 °C |
Curing Time |
3-4 min |
Application of Solar Panel Encapsulant EVA Film

Solar panel encapsulation material EVA film is used in the manufacture of solar panels to provide protection and enhance the performance of photovoltaic cells. Some key applications of EVA films in the solar industry include:
Encapsulation
EVA film is used to encapsulate solar cells within panels, providing a protective layer to protect the cells from environmental factors such as moisture, ultraviolet radiation, and temperature fluctuations.
Lamination
The lamination process uses EVA film to bond the solar cells to the front glass and back panel, creating a durable and weather-resistant component.
Light transmittance
EVA film allows sunlight to be transmitted to solar cells while providing mechanical support and electrical insulation, thereby maximizing energy conversion efficiency.
Flexible solar panels
EVA film is used to produce flexible solar panels, and its flexibility and adhesive properties are crucial for manufacturing lightweight and bendable solar modules.
Lifespan and Reliability
By protecting solar cells from degradation and environmental damage, EVA films help increase the lifespan and reliability of solar panels, ensuring stable energy production over the life of the panels.
Manufacturing of Solar Module Back sheet PET and TPT
What’s EVA Film For Solar Panels?
EVA (ethylene vinyl acetate) film for solar panels is a special packaging material used to manufacture photovoltaic modules. It is a transparent thermoplastic polymer used as a protective layer in solar cells to increase their durability, performance and longevity. EVA films act as a barrier against environmental factors such as moisture, UV radiation, and temperature fluctuations, while also providing adhesion and electrical insulation. Its main function is to encapsulate solar cells and bond them to the front glass and backsheet to form a weather-resistant and durable assembly. EVA films are a key component in the solar panel lamination process, helping to improve the reliability and efficiency of solar panels in converting sunlight into electricity.
How To Test Solar Module Encapsulant EVA Film?
Peel strength test
This test measures the adhesion strength of EVA film to solar cells and other components. It involves applying force to a film to determine its resistance to delamination.
Ultraviolet aging test
Ultraviolet irradiation will cause the EVA film to degrade over time, so accelerated ultraviolet aging testing of the film can simulate long-term exposure to sunlight and evaluate its resistance to ultraviolet radiation.
Hygroscopicity test
EVA film should have low hygroscopicity to prevent moisture from entering and protect solar cells. Testing the hygroscopic properties of the film can ensure its moisture-proof effect.
Transparency test
Since the EVA film should allow maximum light transmission to the solar cell, the transparency test measures the film's ability to transmit light without significant loss.
Thermal stability test
EVA film should maintain its performance over a wide temperature range. Thermal stability testing can evaluate the performance of films under different temperature conditions.
Tensile strength test
This test measures the film’s ability to resist stretching and breaking, ensuring its mechanical strength and durability.
Electrical insulation test
EVA film should provide effective electrical insulation for solar cells. Testing its electrical properties can verify its insulating capabilities.