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Unformatted text preview: strain points is commonly considered the annealing range of a glass. A hard glass has a high softening point A soft glass has a low softening point. A long glass has a large temperature difference between its softening and strain points. Above T g , viscosity follows an Arrhenius form: = o e +Q/RT where Q is the molar activation energy for viscous flow. (The sign on the exponent would be negative if we considered fluidity instead of )...
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- Spring '09