Soda-lime-silica float glass materials with sight glass quality are ideal for all applications that don't require the highest quality surfaces or a high flatness and material purity. The glass is consisting of about 71% silica. To lower glass-transition temperature, sodium carbonate ("soda") is added, which increases the water-solubility of the glass. Adding calcium oxide ("lime"), magnesium oxide, and aluminum oxide, chemical durability is partially gained back. The result is a low-cost glass with a lowered melting temperature, which can efficiently be processed, and that is suitable for all kinds of commercial applications with moderate requirements.
When looking with the naked eye, the glass has a high-quality appearance, and there are no significant defects or inhomogeneities in the material when looking through it. However, this type of soda-lime-silica glass materials does not achieve the excellent surface quality and flatness of our iron-reduced selected float glass. Its physical purity is not as high. For example, with soda-lime glass with sight glass quality, a slight grey haze can become visible under intense inspection light. However, this effect is not perceived under normal lighting conditions, and it has almost no impact on the transmission. About 90% of visible light is still transmitted, which is only 1% less than our selected float glass offers.
Our low-cost soda-lime sight glass has the ideal properties required for less sophisticated applications like glass covers, simple front windows, sight glasses, or protection glasses. It is a low-cost material used for all non-optics applications that do not need a high chemical or heat resistance and do not require to withstand an increased operating temperature.
Due to soda-lime glass materials' properties, we don't recommend using them at a high thermal load or in harsh chemical environments. If you are searching for a glass type with excellent chemical properties and increased temperature resistance, please look at our borosilicate glass datasheet.
*The glass composition can fluctuate from batch to batch. The percentages given are only typical averages and therefore do not add up to exactly 100%. Since soda-lime-silica float glass is not an optics-grade glass, all specifications above are subject to inevitable fluctuations. Therefore, all specifications are only rough approximations.
All given details and specifications are mean reference values and are not guaranteed. Also, please consider the "Notes on technical specifications".
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