Performance requirements of EVA used as photovoltaic module encapsulation

1.Melt index
Affect the melting speed of EVA

2.Softening point
The temperature point at which EVA starts to soften

3.Light transmittance
There are different light transmittances for different spectral distributions,
here mainly refers to the transmittance under the AM1.5 spectral distribution condition

4.Density
Density after crosslinking

5.Specific heat
The specific heat after cross-linking reflects the value of the temperature increase when the cross-linked EVA absorbs the same amount of heat.

6.Thermal conductivity
The thermal conductivity after crosslinking reflects the thermal conductivity of EVA after crosslinking.

7.Glass transition temperature
Reflect low temperature resistance of EVA

8.Tensile strength at break
The breaking tensile strength of EVA after cross-linking reflects the mechanical strength of breaking EVA after cross-linking

9.Elongation at break
The elongation at break of EVA after crosslinking reflects the elongation performance of EVA after crosslinking.

10.Tension coefficient
The tension coefficient of EVA after cross-linking reflects the tension of EVA after cross-linking.

11.Water absorption
Directly affect its sealing performance to the cell

12.Cross-connection rate
The degree of crosslinking of EVA directly affects its impermeability

13.Peel strength
Reflect the adhesive strength of EVA and glass

14.Resistance to UV aging
Affect the outdoor service life of components

15.Heat aging
Affect the outdoor service life of components

16.Resistant to low temperature environmental aging
Affect the outdoor service life of components

17.Heat shrinkage

Affect the component production process

18.Visible impurities and foreign bodies
Affect the component production process

19.VA content
Vinyl acetate content