When talking to the various makers of low iron glass after a few questions came up this is what I got from them. Starphire and our "crystal clear" glass is the same specs from two different manufacturers. PPG, the maker of starphire brand low iron glass, has a much larger presence here in the US than they do in Italy for this type of glass so we do not use them. I have heard the exact opposite argument that our glass is clearer than starphire but the truth is they are both low iron glass with around 90-91% claimed light transmittance values.
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