strain point

…10¹³ poise, and finally the strain point by 10^14.5 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…

…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…