a) Allows maximum 3 Bubbles exist On the cell, each bubble area≤ 1mm ² , and not on the same solar cell;
b) Allows maximum 5 Bubbles exist elsewhere, each bubble area ≤ 1mm ²; allowed 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;
c) Bubble may not form a path between frame and cell
d) Area of inadequate(melted)EVA≤ 4mm²."