Photovoltaic glass impact resistance test and requirements
Safety performance
Photovoltaic glass is the main supporting component in photovoltaic modules, and its safety performance plays a decisive role in the mechanical safety performance of the prepared modules. Safety performance mainly depends on the performance of the original glass used. The indicators usually examined are impact resistance, fragmentation state, thermal shock resistance, shotgun bag impact performance, bending strength, and static pressure resistance.
The impact resistance is to use a 610mm×610mm sample of the same material and a smooth steel ball with a diameter of 63.5mm (mass of about 1040g) to be placed at a height of 1000mm from the surface of the sample, allowing it to fall freely, and observe whether the glass is damaged. The fragmentation state uses a finished size sample, and the number of fragments within the range of 50mm×50mm is calculated after breaking.
The thermal shock resistance uses a 300mm×300mm sample, which is placed in an oven at 200℃ and kept warm for more than 4h. After taking it out, it is immediately immersed vertically in a 0℃ ice-water mixture, and the glass is observed after 5min to see if it is damaged. Shotgun bag impact performance uses 1930mm×864mm size samples, and uses impact bodies to free fall and impact samples at 300mm, 750mm, and 1200mm heights. If broken, weigh the mass of the 10 largest fragments within 5 minutes, and measure the length of the longest fragment without through cracks. Bending strength uses 10 pieces of 1100mm×360mm samples to test four-point bending strength. In addition, GB/T30984.1-2015 "Solar Glass Part 1: Ultra-white Embossed Glass" also has a requirement for static pressure resistance of 2400Pa without damage.