温度・粘度
annealing point
Japanese: 徐冷点
The temperature at which internal stress (strain) can be eliminated (log η ≈ 13). If sufficient time is allowed at this temperature, the permanent strain will be practically zero. / Note: Approximately 482°C for Bullseye COE90 and around 510°C for COE96. Center temperature during slow cooling
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The annealing point is the temperature at which internal stresses (strain) can be removed, corresponding to a viscosity of log η ≈ 13. If sufficient time is allowed at this temperature, the permanent strain becomes practically zero.
It is approximately 482°C for Bullseye COE90 and around 510°C for COE96. These are the target temperatures for slow cooling (annealing).
This entry is written in Japanese by Rei Chikaoka and translated for readers outside Japan. If something reads oddly, the original is the source of truth.