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strain point

mechanics

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properties of glass

  • Figure 2: The irregular arrangement of ions in a sodium silicate glass.
    In industrial glass: Viscosity

    …1013 poise, and finally the strain point by 1014.5 poise. Upon further cooling, viscosity increases rapidly to well beyond 1018 poise, where it can no longer be measured meaningfully. (The softening point and working point of the major oxide glass families are indicated in the table of properties of oxide…

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  • Figure 2: The irregular arrangement of ions in a sodium silicate glass.
    In industrial glass: Annealing

    …the lower temperatures of its strain point. (The strain point and annealing point of several oxide glasses are shown in Figure 5.) Practical annealing is achieved generally by holding the product approximately 5 °C (9 °F) above its annealing point for 5 to 15 minutes, followed by slowly cooling it…

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