hye.anyone knows what is the properties of ultra clear float glass?how the temperture in changing in compare with clear float glass?
Not sure I understand the question fully but I'll try to answer. The difference between ultra clear and clear float glass is in the order of a few hundred ppm of Fe2O3 - If I remember correctly it is about 200 ppm Fe2O3 in ultra clear and 400 ppm in clear float. As the float process is slightly reducing a majority of the iron oxide will be in the Fe2+ oxidation state and have a broad absorption peak centered at about 1050 nm i.e. absorbing in the near infrared and thus creating significant differences when melting glasses that contain different amounts of Fe2+ - so heat is in fact absorbed and thus the thermal conductivity is lowered as the amount of Fe2+ is increased. In a tank furnace the increase of Fe2+ content will lead to a slightly lower temperature in the melt as a consequence of the lower thermal conductivity. See following ref:Chapter Impact of Redox in Industrial Glass Melting and Importance o...
thank you dear friend for your answer.actually i want just wandering the chemical composition diffrencess in two kind of glasses?
Dear Majid, to follow my friend Stefan's comments - the only compositional difference relates to the iron content, as Stefna explained - and this is only differences in ppm levels. So the main component oxides in float glass - SiO2, Na2O, CaO, MgO, Al2O3, will be essentially the same for normal float glass and for ultra clear float glass - the bulk composition is the same. It varies slightly (ca. 0.1-0.2 %) between manufacturers, but this is all.
Kindest Regards
Paul.
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