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High transmittance: High transmittance allows more sunlight to pass through the glass to the solar panel, thereby improving the photoelectric conversion efficiency. The iron content of ultra-white emboweled glass is < 0.015%, the visible light transmittance is > 91.5% (3mm standard thickness), the iron content of ultra-white float glass is < 0.015%, the visible light transmittance is > 91% (5mm standard thickness).

In addition, fog is also a key performance indicator, indicating the ratio of scattered light caused by internal or surface tiny particles, bubbles, magazines, etc., to the total light passing through. In general, for the ultra-white rolled glass used for photovoltaics, the fog should be controlled below 1% to ensure good transparency and visual effects.