8.8 - ♦ Melting point – The temperature where the...

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Viscoelastic Deformation of Glasses The viscosity of a typical soda-lime-silica glass as a function of temperature is shown here. As T increases, the viscosity decreases and viscous flow becomes easier. At room temperature, the glass is elastic. Above T g it is viscous. Hence the deformation behavior of glasses is termed viscoelastic. Various reference points of viscosity are defined that are useful in the processing and manufacture of glass products:
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Unformatted text preview: ♦ Melting point – The temperature where the material is fluid enough to be considered a liquid. This corresponds to a viscosity of about 100 P. (The melting range is η between 50 and 500. Compare with water which has η = 0.01P) ♦ Working point – The temperature corresponding to 10 4 P. At this temperature glass fabrication operations can be carried out. (The working range is η between 10 4 and 10 8 P)...
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