Allows maximum 3 Bubbles exist On the cell, each bubble area≤ 1mm ² , and not on the same solar cell;Allows
maximum 5 Bubbles exist elsewhere, each bubble area≤ 1 mm ²;allows up to 2 or 2 groups of bubbles of the
total area of less than 8mm ²,two or bubble spacing is no less than 2mm; Bubble may not form a path between frame and
cell;Area of inadequate(melted)EVA≤ 4 mm²