POE has better water vapor barrier and anti-PID performance. Compared with EVA film, POE film has obvious advantages.

POE film has good water vapor barrier performance, high volume resistivity, and stronger anti-PID performance. POE is a non-polar material, with only carbon-carbon bonds and carbon-hydrogen bonds, no carbon-oxygen bonds (polarity), and cannot form hydrogen bonds with water molecules. It has good water vapor barrier properties, and its water vapor transmission rate is only 1/10 of that of EVA film. about. It is difficult for water vapor to enter the module through the glass and backplane, which significantly reduces the risk of PID. Volume resistivity is also one of the factors affecting PID. Under the same potential difference, high volume resistivity brings lower leakage current, which can reduce the partial voltage on the battery surface, thereby slowing down the occurrence of PID. According to Dow Chemical, POE has higher volume resistivity and lower water vapor transmission rate. Under the 96h aging test of PERC double glass module (negative bias voltage 1000 V, 85°C, 85%RH), the power attenuation is significantly lower than that of EVA film . POE film has excellent low temperature resistance.

There are no unsaturated double bonds in the molecular structure of POE, and it has a narrow molecular weight distribution and short-chain branched structure (short-chain branched distribution is uniform), so it has excellent physical and mechanical properties such as high elasticity, high strength, and high elongation. low temperature resistance performance. POE materials are easy to heat aging and have good UV resistance.