Solar panel glass is one of the important barriers which protects solar photovoltaic cells against damaging external factors, such as water, vapor, and dirt.The solar panel glass also offers low reflection, high transmissivity, and high strength. In crystalline solar panels, a 3 to 4mm thick solar glass is often used.
The thicker the glass in the crystalline solar panels, the more stable are they. Solar panel glass on cheaper modules may be as thin as 2.5mm. The solar panel glass has a rough surface. This is necessary to make the EVA film bond well to the solar panel glass during the lamination process.