Endurance Testing and Dynamic Viscoelasticity Measurement of EVA Film by MMT-100N

EVA (ethylene vinyl acetate) film, highly elastic, yet stress crack resistant, is widely used as a film for bonding of solar cells. Solar cells reach high temperatures in the daytime when exposed to sunlight, but cool down at night. This requires that the EVA film has sufficient durability to withstand the daily range of thermal expansion and thermal contraction. EVA film is also gradually deteriorated with prolonged usage due to the constant exposure to ultraviolet rays during the daytime. Here, we introduce examples of tensile fatigue (endurance) testing and dynamic viscoelasticity measurement of EVA film before and after ultraviolet irradiation.