Greenish appearance in clear glass is due to the presence of
a small iron content in silica sand. This greenish appearance in float glass is
eliminated in extra clear glass by using purer sand & further reducing
the iron content in silica sand. The typical iron content for normal float
clear glass is 830-850 ppm, whereas the extra clear has less than 150 ppm. This
makes it very clear in vision with high colour rendering index.
Basic glass has to be further processed to make it a more
useful and high performance product to withstand high wind pressures,
increase safety, solar screening, ultraviolet filtration, sound
absorption, energy efficiency & fire resistance and most of all,
provide pleasant interiors and impressive exteriors to perform and to look
good.
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